{"id":111625,"date":"2026-10-01T11:22:59","date_gmt":"2026-10-01T03:22:59","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/111625.html"},"modified":"2026-10-01T11:22:59","modified_gmt":"2026-10-01T03:22:59","slug":"%e8%a7%86%e9%a2%91%e7%94%bb%e9%9d%a2%e8%a3%81%e5%89%aa%e5%b7%a5%e5%85%b7%e7%9a%84%e8%ae%be%e8%ae%a1%e4%b8%8e%e5%ae%9e%e7%8e%b0%ef%bc%9apyqt5%e3%80%81opencv-%e4%b8%8e-ffmpeg-%e7%9a%84%e5%8d%8f%e5%90%8c","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/111625.html","title":{"rendered":"\u89c6\u9891\u753b\u9762\u88c1\u526a\u5de5\u5177\u7684\u8bbe\u8ba1\u4e0e\u5b9e\u73b0\uff1aPyQt5\u3001OpenCV \u4e0e ffmpeg \u7684\u534f\u540c"},"content":{"rendered":"

\u5728\u89c6\u9891\u5904\u7406\u7684\u5b9e\u9645\u5de5\u4f5c\u4e2d，\u7ecf\u5e38\u9700\u8981\u5bf9\u753b\u9762\u8fdb\u884c\u5c40\u90e8\u88c1\u526a，\u4f8b\u5982\u53bb\u9664\u9ed1\u8fb9\u3001\u805a\u7126\u7279\u5b9a\u533a\u57df\u6216\u9002\u914d\u4e0d\u540c\u663e\u793a\u6bd4\u4f8b\u3002\u4e00\u4e2a\u76f4\u89c2\u6613\u7528\u7684\u88c1\u526a\u5de5\u5177\u5e94\u5f53\u5141\u8bb8\u7528\u6237\u5148\u9884\u89c8\u89c6\u9891\u5185\u5bb9，\u518d\u901a\u8fc7\u9f20\u6807\u62d6\u62fd\u9009\u62e9\u4fdd\u7559\u533a\u57df，\u5e76\u5728\u5bfc\u51fa\u65f6\u4fdd\u6301\u539f\u59cb\u6bd4\u4f8b\u4e0e\u97f3\u9891\u8f68\u9053\u3002\u672c\u6587\u5b8c\u6574\u8bb0\u5f55\u4e86\u4e00\u6b3e\u57fa\u4e8e Python\u3001PyQt5\u3001OpenCV \u4e0e ffmpeg \u7684\u89c6\u9891\u88c1\u526a\u5de5\u5177\u7684\u5f00\u53d1\u5386\u7a0b，\u4ece\u754c\u9762\u4ea4\u4e92\u5230\u540e\u53f0\u7f16\u7801，\u5e76\u6df1\u5165\u63a2\u8ba8\u4e86\u5bfc\u5165\u9519\u8bef\u3001\u97f3\u9891\u4e22\u5931\u4ee5\u53ca\u8fdb\u5ea6\u6761\u5361\u6b7b\u8fd9\u4e09\u4e2a\u5178\u578b\u95ee\u9898\u7684\u6210\u56e0\u4e0e\u89e3\u51b3\u65b9\u6848\u3002
\n\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"<\/p>\n

\u754c\u9762\u4ea4\u4e92\u4e0e\u5750\u6807\u6620\u5c04<\/h3>\n

\u5de5\u5177\u7684\u4e3b\u753b\u5e03\u7531\u81ea\u5b9a\u4e49\u63a7\u4ef6 CropCanvas \u5b9e\u73b0\u3002\u5b83\u8d1f\u8d23\u663e\u793a\u89c6\u9891\u5e27，\u5e76\u5141\u8bb8\u7528\u6237\u5728\u5176\u4e0a\u62d6\u62fd\u51fa\u4e00\u4e2a\u77e9\u5f62\u9009\u533a\u3002\u89c6\u9891\u5e27\u7684\u539f\u59cb\u5c3a\u5bf8\u8bb0\u4e3a WframeW_{frame}<\/span><\/span>W<\/span><\/span>f<\/span>r<\/span>am<\/span>e<\/span><\/span><\/span><\/span><\/span>\u200b<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span> \u4e0e HframeH_{frame}<\/span><\/span>H<\/span><\/span>f<\/span>r<\/span>am<\/span>e<\/span><\/span><\/span><\/span><\/span>\u200b<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span>，\u800c\u63a7\u4ef6\u81ea\u8eab\u7684\u5c3a\u5bf8\u4e3a WwidgetW_{widget}<\/span><\/span>W<\/span><\/span>w<\/span>i<\/span>d<\/span>g<\/span>e<\/span>t<\/span><\/span><\/span><\/span><\/span>\u200b<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span> \u4e0e HwidgetH_{widget}<\/span><\/span>H<\/span><\/span>w<\/span>i<\/span>d<\/span>g<\/span>e<\/span>t<\/span><\/span><\/span><\/span><\/span>\u200b<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span>\u3002\u4e3a\u4e86\u5728\u4fdd\u6301\u89c6\u9891\u539f\u59cb\u6bd4\u4f8b\u7684\u524d\u63d0\u4e0b\u5b8c\u6574\u663e\u793a\u753b\u9762，\u9700\u8981\u8ba1\u7b97\u4e00\u4e2a\u7f29\u653e\u56e0\u5b50 ss<\/span><\/span>s<\/span><\/span><\/span><\/span><\/span>，\u4f7f\u5f97\u753b\u9762\u80fd\u591f\u6070\u597d\u653e\u5165\u63a7\u4ef6：<\/p>\n

s=min\u2061(WwidgetWframe,HwidgetHframe)s = \\\\min\\\\left(\\\\frac{W_{widget}}{W_{frame}}, \\\\frac{H_{widget}}{H_{frame}}\\\\right)<\/span><\/span>s<\/span><\/span>=<\/span><\/span><\/span><\/span>min<\/span><\/span>(<\/span><\/span><\/span><\/span>W<\/span><\/span>f<\/span>r<\/span>am<\/span>e<\/span><\/span><\/span><\/span><\/span>\u200b<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span>W<\/span><\/span>w<\/span>i<\/span>d<\/span>g<\/span>e<\/span>t<\/span><\/span><\/span><\/span><\/span>\u200b<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span>\u200b<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span>,<\/span><\/span><\/span><\/span>H<\/span><\/span>f<\/span>r<\/span>am<\/span>e<\/span><\/span><\/span><\/span><\/span>\u200b<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span>H<\/span><\/span>w<\/span>i<\/span>d<\/span>g<\/span>e<\/span>t<\/span><\/span><\/span><\/span><\/span>\u200b<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span>\u200b<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span>)<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/p>\n

\u968f\u540e，\u753b\u9762\u5728\u63a7\u4ef6\u4e2d\u7684\u7ed8\u5236\u533a\u57df RviewR_{view}<\/span><\/span>R<\/span><\/span>v<\/span>i<\/span>e<\/span>w<\/span><\/span><\/span><\/span><\/span>\u200b<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span> \u53ef\u4ee5\u901a\u8fc7\u5c45\u4e2d\u8ba1\u7b97\u5f97\u5230\u3002\u89c6\u9891\u5e27\u4e2d\u7684\u4efb\u610f\u4e00\u70b9 (xframe,yframe)(x_{frame}, y_{frame})<\/span><\/span>(<\/span>x<\/span><\/span>f<\/span>r<\/span>am<\/span>e<\/span><\/span><\/span><\/span><\/span>\u200b<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span>,<\/span><\/span>y<\/span><\/span>f<\/span>r<\/span>am<\/span>e<\/span><\/span><\/span><\/span><\/span>\u200b<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span>)<\/span><\/span><\/span><\/span><\/span> \u6620\u5c04\u5230\u63a7\u4ef6\u5750\u6807 (xview,yview)(x_{view}, y_{view})<\/span><\/span>(<\/span>x<\/span><\/span>v<\/span>i<\/span>e<\/span>w<\/span><\/span><\/span><\/span><\/span>\u200b<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span>,<\/span><\/span>y<\/span><\/span>v<\/span>i<\/span>e<\/span>w<\/span><\/span><\/span><\/span><\/span>\u200b<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span>)<\/span><\/span><\/span><\/span><\/span> \u7684\u516c\u5f0f\u4e3a：<\/p>\n

xview=Rview.x+xframe\u22c5sx_{view} = R_{view}.x + x_{frame} \\\\cdot s<\/span><\/span>x<\/span><\/span>v<\/span>i<\/span>e<\/span>w<\/span><\/span><\/span><\/span><\/span>\u200b<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span>=<\/span><\/span><\/span><\/span>R<\/span><\/span>v<\/span>i<\/span>e<\/span>w<\/span><\/span><\/span><\/span><\/span>\u200b<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span>.<\/span>x<\/span><\/span>+<\/span><\/span><\/span><\/span>x<\/span><\/span>f<\/span>r<\/span>am<\/span>e<\/span><\/span><\/span><\/span><\/span>\u200b<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span>\u22c5<\/span><\/span><\/span><\/span>s<\/span><\/span><\/span><\/span><\/span><\/span>
\nyview=Rview.y+yframe\u22c5sy_{view} = R_{view}.y + y_{frame} \\\\cdot s<\/span><\/span>y<\/span><\/span>v<\/span>i<\/span>e<\/span>w<\/span><\/span><\/span><\/span><\/span>\u200b<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span>=<\/span><\/span><\/span><\/span>R<\/span><\/span>v<\/span>i<\/span>e<\/span>w<\/span><\/span><\/span><\/span><\/span>\u200b<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span>.<\/span>y<\/span><\/span>+<\/span><\/span><\/span><\/span>y<\/span><\/span>f<\/span>r<\/span>am<\/span>e<\/span><\/span><\/span><\/span><\/span>\u200b<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span>\u22c5<\/span><\/span><\/span><\/span>s<\/span><\/span><\/span><\/span><\/span><\/span><\/p>\n

\u53cd\u5411\u6620\u5c04\u5219\u7528\u4e8e\u5c06\u9f20\u6807\u4f4d\u7f6e\u8f6c\u6362\u4e3a\u89c6\u9891\u5e27\u5185\u7684\u50cf\u7d20\u5750\u6807，\u4ece\u800c\u786e\u5b9a\u9009\u533a\u7684\u4f4d\u7f6e\u3002\u9009\u533a\u672c\u8eab\u7528\u4e00\u4e2a\u77e9\u5f62 rect=(x,y,w,h)rect = (x, y, w, h)<\/span><\/span>r<\/span>ec<\/span>t<\/span><\/span>=<\/span><\/span><\/span><\/span>(<\/span>x<\/span>,<\/span><\/span>y<\/span>,<\/span><\/span>w<\/span>,<\/span><\/span>h<\/span>)<\/span><\/span><\/span><\/span><\/span> \u8868\u793a，\u5176\u4e2d xx<\/span><\/span>x<\/span><\/span><\/span><\/span><\/span> \u4e0e yy<\/span><\/span>y<\/span><\/span><\/span><\/span><\/span> \u662f\u5de6\u4e0a\u89d2\u5750\u6807，ww<\/span><\/span>w<\/span><\/span><\/span><\/span><\/span> \u4e0e hh<\/span><\/span>h<\/span><\/span><\/span><\/span><\/span> \u5206\u522b\u662f\u5bbd\u5ea6\u548c\u9ad8\u5ea6\u3002\u5f53\u7528\u6237\u52fe\u9009\u201c\u9501\u5b9a\u539f\u59cb\u6bd4\u4f8b\u201d\u65f6，\u9009\u533a\u5fc5\u987b\u6ee1\u8db3 w\/h=Wframe\/Hframew \/ h = W_{frame} \/ H_{frame}<\/span><\/span>w<\/span>\/<\/span>h<\/span><\/span>=<\/span><\/span><\/span><\/span>W<\/span><\/span>f<\/span>r<\/span>am<\/span>e<\/span><\/span><\/span><\/span><\/span>\u200b<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span>\/<\/span>H<\/span><\/span>f<\/span>r<\/span>am<\/span>e<\/span><\/span><\/span><\/span><\/span>\u200b<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span>\u3002\u5728\u62d6\u62fd\u8c03\u6574\u5927\u5c0f\u65f6，\u7a0b\u5e8f\u4f1a\u4ee5\u56fa\u5b9a\u5bf9\u89d2\u70b9\u4e3a\u951a\u70b9，\u6839\u636e\u9f20\u6807\u4f4d\u7f6e\u91cd\u65b0\u8ba1\u7b97 ww<\/span><\/span>w<\/span><\/span><\/span><\/span><\/span> \u4e0e hh<\/span><\/span>h<\/span><\/span><\/span><\/span><\/span>，\u5e76\u6309\u6bd4\u4f8b\u7ea6\u675f\u8fdb\u884c\u4fee\u6b63，\u6700\u540e\u5c06\u9009\u533a\u9650\u5236\u5728\u753b\u9762\u8fb9\u754c\u5185\u3002<\/p>\n

\u9f20\u6807\u4ea4\u4e92\u5206\u4e3a\u4e09\u79cd\u6a21\u5f0f：\u65b0\u5efa\u9009\u533a\u3001\u79fb\u52a8\u9009\u533a\u548c\u7f29\u653e\u9009\u533a\u3002\u5728 mousePressEvent \u4e2d，\u901a\u8fc7\u5224\u65ad\u9f20\u6807\u662f\u5426\u843d\u5728\u56db\u4e2a\u89d2\u70b9\u7684\u624b\u67c4\u9644\u8fd1\u6765\u51b3\u5b9a\u8fdb\u5165\u7f29\u653e\u6a21\u5f0f；\u82e5\u843d\u5728\u9009\u533a\u5185\u90e8\u5219\u8fdb\u5165\u79fb\u52a8\u6a21\u5f0f；\u5426\u5219\u5f00\u59cb\u65b0\u5efa\u9009\u533a\u3002\u79fb\u52a8\u65f6，\u9009\u533a\u6574\u4f53\u5e73\u79fb，\u4f46\u9700\u4fdd\u8bc1 x\u2208[0,Wframe\u2212w]x \\\\in [0, W_{frame} – w]<\/span><\/span>x<\/span><\/span>\u2208<\/span><\/span><\/span><\/span>[<\/span>0<\/span>,<\/span><\/span>W<\/span><\/span>f<\/span>r<\/span>am<\/span>e<\/span><\/span><\/span><\/span><\/span>\u200b<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span>\u2212<\/span><\/span><\/span><\/span>w<\/span>]<\/span><\/span><\/span><\/span><\/span> \u4e14 y\u2208[0,Hframe\u2212h]y \\\\in [0, H_{frame} – h]<\/span><\/span>y<\/span><\/span>\u2208<\/span><\/span><\/span><\/span>[<\/span>0<\/span>,<\/span><\/span>H<\/span><\/span>f<\/span>r<\/span>am<\/span>e<\/span><\/span><\/span><\/span><\/span>\u200b<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span>\u2212<\/span><\/span><\/span><\/span>h<\/span>]<\/span><\/span><\/span><\/span><\/span>\u3002\u7f29\u653e\u65f6，\u6839\u636e\u62d6\u52a8\u65b9\u5411\u5b9e\u65f6\u8ba1\u7b97\u65b0\u7684 ww<\/span><\/span>w<\/span><\/span><\/span><\/span><\/span> \u4e0e hh<\/span><\/span>h<\/span><\/span><\/span><\/span><\/span>，\u5e76\u5e94\u7528\u6bd4\u4f8b\u9501\u5b9a\u3002\u8fd9\u4e9b\u903b\u8f91\u786e\u4fdd\u4e86\u64cd\u4f5c\u7684\u6d41\u7545\u6027\u4e0e\u8fb9\u754c\u5b89\u5168\u6027\u3002<\/p>\n

\u89c6\u9891\u9884\u89c8\u4e0e\u65f6\u95f4\u63a7\u5236<\/h3>\n

\u89c6\u9891\u7684\u8bfb\u53d6\u4e0e\u9884\u89c8\u7531 OpenCV \u7684 VideoCapture \u5b8c\u6210\u3002\u7a0b\u5e8f\u83b7\u53d6\u89c6\u9891\u7684\u5e27\u7387 fpsfps<\/span><\/span>f<\/span>p<\/span>s<\/span><\/span><\/span><\/span><\/span> \u4e0e\u603b\u5e27\u6570 NN<\/span><\/span>N<\/span><\/span><\/span><\/span><\/span>，\u5e76\u5229\u7528 QTimer \u5b9a\u65f6\u8bfb\u53d6\u4e0b\u4e00\u5e27\u3002\u5b9a\u65f6\u5668\u7684\u95f4\u9694\u4e3a 1000\/fps1000 \/ fps<\/span><\/span>1000\/<\/span>f<\/span>p<\/span>s<\/span><\/span><\/span><\/span><\/span> \u6beb\u79d2，\u4ece\u800c\u6a21\u62df\u51fa\u63a5\u8fd1\u539f\u59cb\u901f\u5ea6\u7684\u64ad\u653e\u6548\u679c\u3002\u5f53\u524d\u64ad\u653e\u65f6\u95f4 tcurt_{cur}<\/span><\/span>t<\/span><\/span>c<\/span>u<\/span>r<\/span><\/span><\/span><\/span><\/span>\u200b<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span> \u4e0e\u603b\u65f6\u957f TtotalT_{total}<\/span><\/span>T<\/span><\/span>t<\/span>o<\/span>t<\/span>a<\/span>l<\/span><\/span><\/span><\/span><\/span>\u200b<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span> \u5206\u522b\u7531\u5f53\u524d\u5e27\u7d22\u5f15 ii<\/span><\/span>i<\/span><\/span><\/span><\/span><\/span> \u548c\u603b\u5e27\u6570\u8ba1\u7b97：<\/p>\n

tcur=ifps,Ttotal=N\u22121fpst_{cur} = \\\\frac{i}{fps}, \\\\quad T_{total} = \\\\frac{N – 1}{fps}<\/span><\/span>t<\/span><\/span>c<\/span>u<\/span>r<\/span><\/span><\/span><\/span><\/span>\u200b<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span>=<\/span><\/span><\/span><\/span><\/span><\/span>f<\/span>p<\/span>s<\/span><\/span><\/span><\/span><\/span><\/span><\/span>i<\/span><\/span><\/span><\/span>\u200b<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span>,<\/span><\/span><\/span>T<\/span><\/span>t<\/span>o<\/span>t<\/span>a<\/span>l<\/span><\/span><\/span><\/span><\/span>\u200b<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span>=<\/span><\/span><\/span><\/span><\/span><\/span>f<\/span>p<\/span>s<\/span><\/span><\/span><\/span><\/span><\/span><\/span>N<\/span><\/span>\u2212<\/span><\/span>1<\/span><\/span><\/span><\/span>\u200b<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/p>\n

\u8fdb\u5ea6\u6761\u4e0e\u65f6\u95f4\u6807\u7b7e\u540c\u6b65\u66f4\u65b0，\u7528\u6237\u53ef\u4ee5\u62d6\u52a8\u6ed1\u5757\u8df3\u8f6c\u5230\u4efb\u610f\u5e27\u3002\u4e3a\u4e86\u907f\u514d\u5728\u62d6\u52a8\u8fc7\u7a0b\u4e2d\u89e6\u53d1\u91cd\u590d\u8bfb\u53d6，\u7a0b\u5e8f\u4f7f\u7528 _seeking \u6807\u5fd7\u8fdb\u884c\u72b6\u6001\u4fdd\u62a4\u3002\u64ad\u653e\u4e0e\u6682\u505c\u901a\u8fc7\u5de5\u5177\u680f\u6309\u94ae\u6216\u7a7a\u683c\u952e\u5207\u6362，\u505c\u6b62\u64ad\u653e\u65f6\u4f1a\u91cd\u7f6e\u6309\u94ae\u6587\u672c\u5e76\u505c\u6b62\u5b9a\u65f6\u5668\u3002<\/p>\n

\u5bfc\u51fa\u65b9\u6848：\u4ece OpenCV \u5230 ffmpeg<\/h3>\n

\u6700\u521d\u7684\u5b9e\u73b0\u4f7f\u7528 OpenCV \u7684 VideoWriter \u9010\u5e27\u5199\u5165\u88c1\u526a\u540e\u7684\u753b\u9762\u3002\u8fd9\u79cd\u65b9\u6cd5\u7b80\u5355\u76f4\u63a5，\u4f46\u5b58\u5728\u4e00\u4e2a\u81f4\u547d\u7f3a\u9677：VideoWriter \u4ec5\u5904\u7406\u89c6\u9891\u5e27，\u5b8c\u5168\u5ffd\u7565\u97f3\u9891\u6d41\u3002\u56e0\u6b64\u5bfc\u51fa\u7684\u89c6\u9891\u6ca1\u6709\u58f0\u97f3，\u65e0\u6cd5\u6ee1\u8db3\u201c\u4fdd\u7559\u539f\u89c6\u9891\u97f3\u8f68\u201d\u7684\u9700\u6c42\u3002<\/p>\n

\u8981\u540c\u65f6\u5904\u7406\u89c6\u9891\u4e0e\u97f3\u9891，\u5fc5\u987b\u501f\u52a9 ffmpeg\u3002ffmpeg \u662f\u4e00\u4e2a\u529f\u80fd\u5f3a\u5927\u7684\u591a\u5a92\u4f53\u6846\u67b6，\u80fd\u591f\u5bf9\u89c6\u9891\u8fdb\u884c\u6ee4\u955c\u5904\u7406\u5e76\u91cd\u65b0\u7f16\u7801\u97f3\u9891\u3002\u7a0b\u5e8f\u4e2d\u901a\u8fc7 subprocess \u8c03\u7528 ffmpeg，\u6838\u5fc3\u547d\u4ee4\u5982\u4e0b：<\/p>\n

ffmpeg -y -hide_banner -i input.mp4 -vf crop=w:h:x:y -c:v libx264 -crf 18 -preset medium -pix_fmt yuv420p -c:a aac -b:a 192k -movflags +faststart -progress pipe:1 output.mp4<\/p>\n

\u5176\u4e2d -vf crop=w:h:x:y \u6307\u5b9a\u88c1\u526a\u533a\u57df，\u53c2\u6570\u987a\u5e8f\u4e3a\u5bbd\u5ea6\u3001\u9ad8\u5ea6\u3001\u5de6\u4e0a\u89d2 xx<\/span><\/span>x<\/span><\/span><\/span><\/span><\/span> \u5750\u6807\u3001\u5de6\u4e0a\u89d2 yy<\/span><\/span>y<\/span><\/span><\/span><\/span><\/span> \u5750\u6807\u3002\u89c6\u9891\u7f16\u7801\u91c7\u7528 libx264，\u8d28\u91cf\u7531 -crf 18 \u63a7\u5236，\u6570\u503c\u8d8a\u4f4e\u753b\u8d28\u8d8a\u597d\u3002\u97f3\u9891\u7f16\u7801\u91c7\u7528 aac，\u6bd4\u7279\u7387\u4e3a 192192<\/span><\/span>192<\/span><\/span><\/span><\/span><\/span> kbps，\u517c\u5bb9\u6027\u6781\u4f73\u3002-movflags +faststart \u4f7f\u5f97 MP4 \u6587\u4ef6\u7684\u5143\u6570\u636e\u524d\u7f6e，\u4fbf\u4e8e\u7f51\u7edc\u64ad\u653e\u3002-progress pipe:1 \u5c06\u8fdb\u5ea6\u4fe1\u606f\u8f93\u51fa\u5230\u6807\u51c6\u8f93\u51fa，\u4f9b\u7a0b\u5e8f\u89e3\u6790\u3002<\/p>\n

\u4e3a\u4e86\u5728\u754c\u9762\u4e0a\u5b9e\u65f6\u663e\u793a\u5bfc\u51fa\u8fdb\u5ea6，\u7a0b\u5e8f\u89e3\u6790 ffmpeg \u8f93\u51fa\u7684 out_time_us= \u6216 out_time_ms= \u884c，\u5f97\u5230\u5df2\u7f16\u7801\u7684\u65f6\u95f4 toutt_{out}<\/span><\/span>t<\/span><\/span>o<\/span>u<\/span>t<\/span><\/span><\/span><\/span><\/span>\u200b<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span>（\u5355\u4f4d\u79d2），\u518d\u7ed3\u5408\u89c6\u9891\u603b\u65f6\u957f TtotalT_{total}<\/span><\/span>T<\/span><\/span>t<\/span>o<\/span>t<\/span>a<\/span>l<\/span><\/span><\/span><\/span><\/span>\u200b<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span> \u8ba1\u7b97\u767e\u5206\u6bd4 pp<\/span><\/span>p<\/span><\/span><\/span><\/span><\/span>：<\/p>\n

p=min\u2061(99,max\u2061(0,\u230atoutTtotal\u00d7100\u230b))p = \\\\min\\\\left(99, \\\\max\\\\left(0, \\\\left\\\\lfloor \\\\frac{t_{out}}{T_{total}} \\\\times 100 \\\\right\\\\rfloor\\\\right)\\\\right)<\/span><\/span>p<\/span><\/span>=<\/span><\/span><\/span><\/span>min<\/span><\/span>(<\/span><\/span>99<\/span>,<\/span><\/span>max<\/span><\/span>(<\/span><\/span>0<\/span>,<\/span><\/span>\u230a<\/span><\/span><\/span><\/span>T<\/span><\/span>t<\/span>o<\/span>t<\/span>a<\/span>l<\/span><\/span><\/span><\/span><\/span>\u200b<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span>t<\/span><\/span>o<\/span>u<\/span>t<\/span><\/span><\/span><\/span><\/span>\u200b<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span>\u200b<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span>\u00d7<\/span><\/span>100<\/span>\u230b<\/span><\/span><\/span>)<\/span><\/span><\/span>)<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/p>\n

\u5f53\u7f16\u7801\u7ed3\u675f\u65f6，\u76f4\u63a5\u5c06\u8fdb\u5ea6\u7f6e\u4e3a 100%100\\\\%<\/span><\/span>100%<\/span><\/span><\/span><\/span><\/span>，\u5e76\u5f39\u51fa\u5b8c\u6210\u63d0\u793a\u3002\u82e5\u7528\u6237\u4e2d\u9014\u70b9\u51fb\u53d6\u6d88，\u7a0b\u5e8f\u4f1a\u7ec8\u6b62 ffmpeg \u8fdb\u7a0b\u5e76\u5220\u9664\u672a\u5b8c\u6210\u7684\u8f93\u51fa\u6587\u4ef6\u3002<\/p>\n

\u8fdb\u5ea6\u6761\u5361\u6b7b\u4e0e\u7ba1\u9053\u6b7b\u9501<\/h3>\n

\u5728\u521d\u6b65\u5b9e\u73b0 ffmpeg \u5bfc\u51fa\u540e，\u8fdb\u5ea6\u6761\u7ecf\u5e38\u5361\u5728\u67d0\u4e2a\u767e\u5206\u6bd4（\u4f8b\u5982 81%81\\\\%<\/span><\/span>81%<\/span><\/span><\/span><\/span><\/span>）\u4e0d\u518d\u524d\u8fdb，\u7a0b\u5e8f\u770b\u4f3c\u65e0\u54cd\u5e94\u3002\u7ecf\u8fc7\u5206\u6790，\u6839\u672c\u539f\u56e0\u5728\u4e8e subprocess.Popen \u7684 stderr \u7ba1\u9053\u88ab\u5199\u6ee1，\u5bfc\u81f4 ffmpeg \u8fdb\u7a0b\u963b\u585e\u3002<\/p>\n

ffmpeg \u5728\u8fd0\u884c\u8fc7\u7a0b\u4e2d\u4f1a\u5411\u6807\u51c6\u9519\u8bef\u8f93\u51fa\u5927\u91cf\u65e5\u5fd7\u4fe1\u606f，\u5305\u62ec\u7f16\u7801\u53c2\u6570\u3001\u8b66\u544a\u548c\u7edf\u8ba1\u4fe1\u606f\u3002\u82e5\u4f7f\u7528 subprocess.PIPE \u521b\u5efa stderr \u7ba1\u9053，\u4f46\u4e0d\u5728\u7f16\u7801\u8fc7\u7a0b\u4e2d\u53ca\u65f6\u8bfb\u53d6，\u8fd9\u4e9b\u65e5\u5fd7\u4f1a\u9010\u6e10\u586b\u6ee1\u7ba1\u9053\u7684\u5185\u6838\u7f13\u51b2\u533a\u3002\u5728 Linux \u4e0e Windows \u4e0a，\u7ba1\u9053\u7f13\u51b2\u533a\u7684\u5178\u578b\u5927\u5c0f\u7ea6\u4e3a 6464<\/span><\/span>64<\/span><\/span><\/span><\/span><\/span> KB\u3002\u4e00\u65e6\u7f13\u51b2\u533a\u6ee1，ffmpeg \u5728\u5c1d\u8bd5\u5199\u5165\u4e0b\u4e00\u6761\u65e5\u5fd7\u65f6\u5c31\u4f1a\u963b\u585e，\u65e0\u6cd5\u7ee7\u7eed\u7f16\u7801，\u81ea\u7136\u4e5f\u65e0\u6cd5\u8f93\u51fa\u8fdb\u5ea6\u4fe1\u606f\u3002\u800c\u4e3b\u7ebf\u7a0b\u6b64\u65f6\u6b63\u7b49\u5f85\u8bfb\u53d6 stdout，\u53cc\u65b9\u4e92\u76f8\u7b49\u5f85，\u5f62\u6210\u6b7b\u9501\u3002<\/p>\n

\u89e3\u51b3\u65b9\u6848\u662f\u5c06 stderr \u5408\u5e76\u5230 stdout，\u5373\u8bbe\u7f6e stderr=subprocess.STDOUT\u3002\u8fd9\u6837\u6240\u6709\u8f93\u51fa\u90fd\u901a\u8fc7\u540c\u4e00\u4e2a\u7ba1\u9053\u8fd4\u56de，\u7a0b\u5e8f\u53ea\u9700\u5728\u5faa\u73af\u4e2d\u9010\u884c\u8bfb\u53d6 stdout，\u65e2\u80fd\u89e3\u6790\u8fdb\u5ea6\u884c，\u53c8\u80fd\u6536\u96c6\u9519\u8bef\u884c\u7528\u4e8e\u8bca\u65ad\u3002\u7531\u4e8e\u8f93\u51fa\u6d41\u88ab\u6301\u7eed\u6d88\u8d39，\u7ba1\u9053\u6c38\u8fdc\u4e0d\u4f1a\u88ab\u5199\u6ee1，ffmpeg \u5f97\u4ee5\u987a\u7545\u8fd0\u884c\u3002\u540c\u65f6，\u7a0b\u5e8f\u5c06\u975e\u8fdb\u5ea6\u884c\u6682\u5b58\u4e8e\u5217\u8868 error_lines \u4e2d，\u82e5\u8fdb\u7a0b\u8fd4\u56de\u7801\u975e\u96f6，\u5219\u4ece\u5217\u8868\u4e2d\u63d0\u53d6\u6700\u540e\u82e5\u5e72\u884c\u4f5c\u4e3a\u9519\u8bef\u63d0\u793a，\u65b9\u4fbf\u5b9a\u4f4d\u95ee\u9898\u3002<\/p>\n

\u6b64\u5916，\u53d6\u6d88\u64cd\u4f5c\u901a\u8fc7\u8c03\u7528 terminate() \u7ec8\u6b62 ffmpeg \u8fdb\u7a0b，\u5e76\u5728\u4e8b\u540e\u6e05\u7406\u8f93\u51fa\u6587\u4ef6，\u786e\u4fdd\u4e0d\u4f1a\u7559\u4e0b\u635f\u574f\u7684\u89c6\u9891\u3002\u6700\u7ec8，\u8fdb\u5ea6\u6761\u80fd\u591f\u5e73\u7a33\u5730\u4ece 0%0\\\\%<\/span><\/span>0%<\/span><\/span><\/span><\/span><\/span> \u63a8\u8fdb\u5230 99%99\\\\%<\/span><\/span>99%<\/span><\/span><\/span><\/span><\/span>，\u5e76\u5728\u7ed3\u675f\u65f6\u8df3\u81f3 100%100\\\\%<\/span><\/span>100%<\/span><\/span><\/span><\/span><\/span>，\u6574\u4e2a\u5bfc\u51fa\u8fc7\u7a0b\u7a33\u5b9a\u53ef\u9760\u3002<\/p>\n

\u5b8c\u6574\u4ee3\u7801<\/h3>\n

\u4ee5\u4e0b\u662f\u7ecf\u8fc7\u6240\u6709\u4fee\u6b63\u540e\u7684\u5b8c\u6574\u5b9e\u73b0\u3002\u4ee3\u7801\u5305\u542b\u754c\u9762\u7ed8\u5236\u3001\u9f20\u6807\u4ea4\u4e92\u3001\u89c6\u9891\u9884\u89c8\u3001ffmpeg \u5bfc\u51fa\u4ee5\u53ca\u9519\u8bef\u5904\u7406，\u53ef\u76f4\u63a5\u8fd0\u884c\u3002<\/p>\n

# -*- coding: utf-8 -*-<\/span>
\n"""
\n\u89c6\u9891\u753b\u9762\u88c1\u526a\u5de5\u5177 (PyQt5 + OpenCV + ffmpeg)<\/p>\n

\u529f\u80fd：
\n 1. \u6253\u5f00\u89c6\u9891，\u9010\u5e27\u9884\u89c8\u64ad\u653e
\n 2. \u5728\u9884\u89c8\u753b\u9762\u4e0a\u9f20\u6807\u62d6\u62fd\u6846\u9009\u88c1\u526a\u533a\u57df（\u53ef\u79fb\u52a8 \/ \u56db\u89d2\u7f29\u653e）
\n 3. \u53ef\u9501\u5b9a\u4e0e\u539f\u59cb\u89c6\u9891\u4e00\u81f4\u7684\u6bd4\u4f8b
\n 4. \u5bfc\u51fa\u88c1\u526a\u540e\u7684\u89c6\u9891（\u4fdd\u7559\u539f\u59cb\u97f3\u9891）<\/p>\n

\u4f9d\u8d56：
\n pip install opencv-python pyqt5 numpy
\n pip install imageio-ffmpeg # \u53ef\u9009，\u7528\u4e8e\u81ea\u52a8\u83b7\u53d6 ffmpeg
\n \u6216\u81ea\u884c\u5b89\u88c5 ffmpeg \u5e76\u52a0\u5165 PATH
\n"""<\/span><\/p>\n

import<\/span> os
\nimport<\/span> sys
\nimport<\/span> shutil
\nimport<\/span> subprocess<\/p>\n

import<\/span> cv2
\nimport<\/span> numpy as<\/span> np<\/p>\n

from<\/span> PyQt5.<\/span>QtCore import<\/span> (<\/span>
\n Qt,<\/span> QTimer,<\/span> QRectF,<\/span> QPointF,<\/span> QThread,<\/span> pyqtSignal
\n)<\/span>
\nfrom<\/span> PyQt5.<\/span>QtGui import<\/span> (<\/span>
\n QImage,<\/span> QPixmap,<\/span> QPainter,<\/span> QPen,<\/span> QColor,<\/span> QPainterPath,<\/span> QKeySequence
\n)<\/span>
\nfrom<\/span> PyQt5.<\/span>QtWidgets import<\/span> (<\/span>
\n QApplication,<\/span> QMainWindow,<\/span> QWidget,<\/span> QLabel,<\/span> QSlider,<\/span> QCheckBox,<\/span>
\n QVBoxLayout,<\/span> QHBoxLayout,<\/span> QFileDialog,<\/span> QMessageBox,<\/span> QProgressDialog,<\/span>
\n QSizePolicy,<\/span> QToolBar,<\/span> QAction,<\/span> QShortcut
\n)<\/span><\/p>\n

# ————————————————————————— #<\/span>
\n# \u5de5\u5177\u51fd\u6570<\/span>
\n# ————————————————————————— #<\/span>
\ndef<\/span> cv2_to_qimage<\/span>(<\/span>frame_bgr:<\/span> np.<\/span>ndarray)<\/span> –<\/span>><\/span> QImage:<\/span>
\n """OpenCV BGR \u56fe\u50cf -> QImage（RGB888）"""<\/span>
\n rgb =<\/span> cv2.<\/span>cvtColor(<\/span>frame_bgr,<\/span> cv2.<\/span>COLOR_BGR2RGB)<\/span>
\n h,<\/span> w,<\/span> ch =<\/span> rgb.<\/span>shape
\n return<\/span> QImage(<\/span>rgb.<\/span>data,<\/span> w,<\/span> h,<\/span> ch *<\/span> w,<\/span> QImage.<\/span>Format_RGB888)<\/span>.<\/span>copy(<\/span>)<\/span><\/p>\n

def<\/span> find_ffmpeg<\/span>(<\/span>)<\/span>:<\/span>
\n """\u4f9d\u6b21\u4ece PATH\u3001imageio-ffmpeg\u3001\u5e38\u89c1\u5b89\u88c5\u4f4d\u7f6e\u67e5\u627e ffmpeg \u53ef\u6267\u884c\u6587\u4ef6"""<\/span>
\n p =<\/span> shutil.<\/span>which(<\/span>"ffmpeg"<\/span>)<\/span>
\n if<\/span> p:<\/span>
\n return<\/span> p
\n try<\/span>:<\/span>
\n import<\/span> imageio_ffmpeg # type: ignore<\/span>
\n return<\/span> imageio_ffmpeg.<\/span>get_ffmpeg_exe(<\/span>)<\/span>
\n except<\/span> Exception:<\/span>
\n pass<\/span>
\n candidates =<\/span> [<\/span>
\n r"C:\\\\ffmpeg\\\\bin\\\\ffmpeg.exe"<\/span>,<\/span>
\n r"C:\\\\Program Files\\\\ffmpeg\\\\bin\\\\ffmpeg.exe"<\/span>,<\/span>
\n r"D:\\\\ffmpeg\\\\bin\\\\ffmpeg.exe"<\/span>,<\/span>
\n os.<\/span>path.<\/span>expanduser(<\/span>r"~\\\\ffmpeg\\\\bin\\\\ffmpeg.exe"<\/span>)<\/span>,<\/span>
\n ]<\/span>
\n for<\/span> c in<\/span> candidates:<\/span>
\n if<\/span> os.<\/span>path.<\/span>isfile(<\/span>c)<\/span>:<\/span>
\n return<\/span> c
\n return<\/span> None<\/span><\/p>\n

# ————————————————————————— #<\/span>
\n# \u88c1\u526a\u753b\u5e03：\u663e\u793a\u5e27 + \u62d6\u62fd\u6846\u9009<\/span>
\n# ————————————————————————— #<\/span>
\nclass<\/span> CropCanvas<\/span>(<\/span>QWidget)<\/span>:<\/span>
\n """\u663e\u793a\u89c6\u9891\u5e27，\u5e76\u5141\u8bb8\u5728\u5176\u4e0a\u62d6\u62fd\u6846\u9009\u88c1\u526a\u533a\u57df（\u5750\u6807\u4ee5\u89c6\u9891\u539f\u59cb\u50cf\u7d20\u4e3a\u5355\u4f4d）"""<\/span><\/p>\n

cropChanged =<\/span> pyqtSignal(<\/span>QRectF)<\/span><\/p>\n

MIN_SIZE =<\/span> 16.0<\/span> # \u6700\u5c0f\u9009\u533a\u5c3a\u5bf8（\u50cf\u7d20）<\/span>
\n HANDLE_SIZE =<\/span> 9<\/span> # \u89d2\u70b9\u624b\u67c4\u7ed8\u5236\u5c3a\u5bf8<\/span>
\n HANDLE_HIT =<\/span> 11<\/span> # \u89d2\u70b9\u624b\u67c4\u547d\u4e2d\u534a\u5f84<\/span><\/p>\n

def<\/span> __init__<\/span>(<\/span>self,<\/span> parent=<\/span>None<\/span>)<\/span>:<\/span>
\n super<\/span>(<\/span>)<\/span>.<\/span>__init__(<\/span>parent)<\/span>
\n self.<\/span>setMinimumSize(<\/span>480<\/span>,<\/span> 300<\/span>)<\/span>
\n self.<\/span>setSizePolicy(<\/span>QSizePolicy.<\/span>Expanding,<\/span> QSizePolicy.<\/span>Expanding)<\/span>
\n self.<\/span>setMouseTracking(<\/span>True<\/span>)<\/span>
\n self.<\/span>setCursor(<\/span>Qt.<\/span>CrossCursor)<\/span>
\n self.<\/span>setFocusPolicy(<\/span>Qt.<\/span>StrongFocus)<\/span><\/p>\n

self.<\/span>_pixmap =<\/span> None<\/span>
\n self.<\/span>_frame_size =<\/span> (<\/span>0<\/span>,<\/span> 0<\/span>)<\/span> # (w, h) \u89c6\u9891\u539f\u59cb\u5c3a\u5bf8<\/span>
\n self.<\/span>_crop =<\/span> None<\/span> # \u9009\u533a（\u89c6\u9891\u50cf\u7d20\u5750\u6807）<\/span>
\n self.<\/span>_aspect =<\/span> 16.0<\/span> \/<\/span> 9.0<\/span>
\n self.<\/span>_lock_aspect =<\/span> True<\/span><\/p>\n

# \u62d6\u62fd\u72b6\u6001<\/span>
\n self.<\/span>_mode =<\/span> None<\/span> # 'new' \/ 'move' \/ 'resize'<\/span>
\n self.<\/span>_drag_origin =<\/span> None<\/span> # QPointF（\u5e27\u5750\u6807）<\/span>
\n self.<\/span>_crop_at_press =<\/span> None<\/span>
\n self.<\/span>_crop_before_drag =<\/span> None<\/span>
\n self.<\/span>_anchor =<\/span> None<\/span> # \u7f29\u653e\u65f6\u56fa\u5b9a\u7684\u5bf9\u89d2\u70b9（\u5e27\u5750\u6807）<\/span><\/p>\n

# —————- \u5bf9\u5916\u63a5\u53e3 —————-<\/span>
\n def<\/span> reset_for_new_video<\/span>(<\/span>self,<\/span> w:<\/span> int<\/span>,<\/span> h:<\/span> int<\/span>)<\/span>:<\/span>
\n self.<\/span>_frame_size =<\/span> (<\/span>w,<\/span> h)<\/span>
\n self.<\/span>_aspect =<\/span> (<\/span>w \/<\/span> h)<\/span> if<\/span> h else<\/span> 16.0<\/span> \/<\/span> 9.0<\/span>
\n self.<\/span>_crop =<\/span> None<\/span>
\n self.<\/span>_pixmap =<\/span> None<\/span>
\n self.<\/span>update(<\/span>)<\/span><\/p>\n

def<\/span> set_frame<\/span>(<\/span>self,<\/span> frame_bgr:<\/span> np.<\/span>ndarray)<\/span>:<\/span>
\n if<\/span> frame_bgr is<\/span> None<\/span>:<\/span>
\n return<\/span>
\n h,<\/span> w =<\/span> frame_bgr.<\/span>shape[<\/span>:<\/span>2<\/span>]<\/span>
\n if<\/span> (<\/span>w,<\/span> h)<\/span> !=<\/span> self.<\/span>_frame_size:<\/span>
\n self.<\/span>reset_for_new_video(<\/span>w,<\/span> h)<\/span>
\n self.<\/span>_pixmap =<\/span> QPixmap.<\/span>fromImage(<\/span>cv2_to_qimage(<\/span>frame_bgr)<\/span>)<\/span>
\n if<\/span> self.<\/span>_crop is<\/span> None<\/span>:<\/span>
\n self.<\/span>_init_crop(<\/span>)<\/span>
\n self.<\/span>cropChanged.<\/span>emit(<\/span>QRectF(<\/span>self.<\/span>_crop)<\/span>)<\/span>
\n self.<\/span>update(<\/span>)<\/span><\/p>\n

def<\/span> reset_crop<\/span>(<\/span>self)<\/span>:<\/span>
\n if<\/span> self.<\/span>_frame_size[<\/span>0<\/span>]<\/span> <=<\/span> 0<\/span>:<\/span>
\n return<\/span>
\n self.<\/span>_init_crop(<\/span>)<\/span>
\n self.<\/span>cropChanged.<\/span>emit(<\/span>QRectF(<\/span>self.<\/span>_crop)<\/span>)<\/span>
\n self.<\/span>update(<\/span>)<\/span><\/p>\n

def<\/span> set_lock_aspect<\/span>(<\/span>self,<\/span> flag:<\/span> bool<\/span>)<\/span>:<\/span>
\n self.<\/span>_lock_aspect =<\/span> bool<\/span>(<\/span>flag)<\/span>
\n if<\/span> self.<\/span>_lock_aspect and<\/span> self.<\/span>_crop is<\/span> not<\/span> None<\/span>:<\/span>
\n self.<\/span>_crop =<\/span> self.<\/span>_clamp_rect(<\/span>self.<\/span>_crop)<\/span>
\n self.<\/span>cropChanged.<\/span>emit(<\/span>QRectF(<\/span>self.<\/span>_crop)<\/span>)<\/span>
\n self.<\/span>update(<\/span>)<\/span><\/p>\n

def<\/span> crop_rect<\/span>(<\/span>self)<\/span>:<\/span>
\n return<\/span> QRectF(<\/span>self.<\/span>_crop)<\/span> if<\/span> self.<\/span>_crop is<\/span> not<\/span> None<\/span> else<\/span> None<\/span><\/p>\n

# —————- \u5750\u6807\u6362\u7b97 —————-<\/span>
\n def<\/span> _view_rect<\/span>(<\/span>self)<\/span> –<\/span>><\/span> QRectF:<\/span>
\n """\u89c6\u9891\u753b\u9762\u5728\u63a7\u4ef6\u4e2d\u7684\u7ed8\u5236\u533a\u57df（\u4fdd\u6301\u6bd4\u4f8b，\u5c45\u4e2d）"""<\/span>
\n fw,<\/span> fh =<\/span> self.<\/span>_frame_size
\n if<\/span> fw <=<\/span> 0<\/span> or<\/span> fh <=<\/span> 0<\/span> or<\/span> self.<\/span>width(<\/span>)<\/span> <=<\/span> 0<\/span> or<\/span> self.<\/span>height(<\/span>)<\/span> <=<\/span> 0<\/span>:<\/span>
\n return<\/span> QRectF(<\/span>0<\/span>,<\/span> 0<\/span>,<\/span> 1<\/span>,<\/span> 1<\/span>)<\/span>
\n s =<\/span> min<\/span>(<\/span>self.<\/span>width(<\/span>)<\/span> \/<\/span> fw,<\/span> self.<\/span>height(<\/span>)<\/span> \/<\/span> fh)<\/span>
\n dw,<\/span> dh =<\/span> fw *<\/span> s,<\/span> fh *<\/span> s
\n return<\/span> QRectF(<\/span>(<\/span>self.<\/span>width(<\/span>)<\/span> –<\/span> dw)<\/span> \/<\/span> 2.0<\/span>,<\/span>
\n (<\/span>self.<\/span>height(<\/span>)<\/span> –<\/span> dh)<\/span> \/<\/span> 2.0<\/span>,<\/span> dw,<\/span> dh)<\/span><\/p>\n

def<\/span> _scale<\/span>(<\/span>self)<\/span> –<\/span>><\/span> float<\/span>:<\/span>
\n r =<\/span> self.<\/span>_view_rect(<\/span>)<\/span>
\n fw =<\/span> self.<\/span>_frame_size[<\/span>0<\/span>]<\/span>
\n return<\/span> (<\/span>r.<\/span>width(<\/span>)<\/span> \/<\/span> fw)<\/span> if<\/span> fw ><\/span> 0<\/span> else<\/span> 1.0<\/span><\/p>\n

def<\/span> _to_view<\/span>(<\/span>self,<\/span> pt:<\/span> QPointF)<\/span> –<\/span>><\/span> QPointF:<\/span>
\n r =<\/span> self.<\/span>_view_rect(<\/span>)<\/span>
\n s =<\/span> self.<\/span>_scale(<\/span>)<\/span>
\n return<\/span> QPointF(<\/span>r.<\/span>x(<\/span>)<\/span> +<\/span> pt.<\/span>x(<\/span>)<\/span> *<\/span> s,<\/span> r.<\/span>y(<\/span>)<\/span> +<\/span> pt.<\/span>y(<\/span>)<\/span> *<\/span> s)<\/span><\/p>\n

def<\/span> _to_frame<\/span>(<\/span>self,<\/span> pt)<\/span> –<\/span>><\/span> QPointF:<\/span>
\n r =<\/span> self.<\/span>_view_rect(<\/span>)<\/span>
\n s =<\/span> self.<\/span>_scale(<\/span>)<\/span>
\n if<\/span> s <=<\/span> 0<\/span>:<\/span>
\n return<\/span> QPointF(<\/span>0<\/span>,<\/span> 0<\/span>)<\/span>
\n return<\/span> QPointF(<\/span>(<\/span>pt.<\/span>x(<\/span>)<\/span> –<\/span> r.<\/span>x(<\/span>)<\/span>)<\/span> \/<\/span> s,<\/span> (<\/span>pt.<\/span>y(<\/span>)<\/span> –<\/span> r.<\/span>y(<\/span>)<\/span>)<\/span> \/<\/span> s)<\/span><\/p>\n

def<\/span> _crop_view_rect<\/span>(<\/span>self)<\/span> –<\/span>><\/span> QRectF:<\/span>
\n if<\/span> self.<\/span>_crop is<\/span> None<\/span>:<\/span>
\n return<\/span> QRectF(<\/span>)<\/span>
\n tl =<\/span> self.<\/span>_to_view(<\/span>self.<\/span>_crop.<\/span>topLeft(<\/span>)<\/span>)<\/span>
\n br =<\/span> self.<\/span>_to_view(<\/span>self.<\/span>_crop.<\/span>bottomRight(<\/span>)<\/span>)<\/span>
\n return<\/span> QRectF(<\/span>tl,<\/span> br)<\/span>.<\/span>normalized(<\/span>)<\/span><\/p>\n

# —————- \u9009\u533a\u51e0\u4f55 —————-<\/span>
\n def<\/span> _init_crop<\/span>(<\/span>self)<\/span>:<\/span>
\n fw,<\/span> fh =<\/span> self.<\/span>_frame_size
\n if<\/span> fw <=<\/span> 0<\/span> or<\/span> fh <=<\/span> 0<\/span>:<\/span>
\n return<\/span>
\n w =<\/span> fw *<\/span> 0.8<\/span>
\n h =<\/span> fh *<\/span> 0.8<\/span>
\n if<\/span> self.<\/span>_lock_aspect and<\/span> self.<\/span>_aspect ><\/span> 0<\/span>:<\/span>
\n h =<\/span> w \/<\/span> self.<\/span>_aspect
\n if<\/span> h ><\/span> fh:<\/span>
\n h =<\/span> fh *<\/span> 0.8<\/span>
\n w =<\/span> h *<\/span> self.<\/span>_aspect
\n self.<\/span>_crop =<\/span> QRectF(<\/span>(<\/span>fw –<\/span> w)<\/span> \/<\/span> 2.0<\/span>,<\/span> (<\/span>fh –<\/span> h)<\/span> \/<\/span> 2.0<\/span>,<\/span> w,<\/span> h)<\/span><\/p>\n

def<\/span> _clamp_point<\/span>(<\/span>self,<\/span> p:<\/span> QPointF)<\/span> –<\/span>><\/span> QPointF:<\/span>
\n fw,<\/span> fh =<\/span> self.<\/span>_frame_size
\n return<\/span> QPointF(<\/span>min<\/span>(<\/span>max<\/span>(<\/span>p.<\/span>x(<\/span>)<\/span>,<\/span> 0.0<\/span>)<\/span>,<\/span> fw)<\/span>,<\/span>
\n min<\/span>(<\/span>max<\/span>(<\/span>p.<\/span>y(<\/span>)<\/span>,<\/span> 0.0<\/span>)<\/span>,<\/span> fh)<\/span>)<\/span><\/p>\n

def<\/span> _clamp_rect<\/span>(<\/span>self,<\/span> r:<\/span> QRectF)<\/span> –<\/span>><\/span> QRectF:<\/span>
\n """\u628a\u77e9\u5f62\u9650\u5236\u5728\u753b\u9762\u5185，\u5fc5\u8981\u65f6\u6309\u6bd4\u4f8b\u6536\u7f29"""<\/span>
\n fw,<\/span> fh =<\/span> self.<\/span>_frame_size
\n if<\/span> fw <=<\/span> 0<\/span> or<\/span> fh <=<\/span> 0<\/span>:<\/span>
\n return<\/span> r
\n w =<\/span> min<\/span>(<\/span>max<\/span>(<\/span>r.<\/span>width(<\/span>)<\/span>,<\/span> 1.0<\/span>)<\/span>,<\/span> float<\/span>(<\/span>fw)<\/span>)<\/span>
\n h =<\/span> min<\/span>(<\/span>max<\/span>(<\/span>r.<\/span>height(<\/span>)<\/span>,<\/span> 1.0<\/span>)<\/span>,<\/span> float<\/span>(<\/span>fh)<\/span>)<\/span>
\n if<\/span> self.<\/span>_lock_aspect and<\/span> self.<\/span>_aspect ><\/span> 0<\/span>:<\/span>
\n if<\/span> w \/<\/span> h ><\/span> self.<\/span>_aspect:<\/span>
\n w =<\/span> h *<\/span> self.<\/span>_aspect
\n else<\/span>:<\/span>
\n h =<\/span> w \/<\/span> self.<\/span>_aspect
\n w =<\/span> min<\/span>(<\/span>w,<\/span> float<\/span>(<\/span>fw)<\/span>)<\/span>
\n h =<\/span> min<\/span>(<\/span>h,<\/span> float<\/span>(<\/span>fh)<\/span>)<\/span>
\n x =<\/span> min<\/span>(<\/span>max<\/span>(<\/span>r.<\/span>x(<\/span>)<\/span>,<\/span> 0.0<\/span>)<\/span>,<\/span> fw –<\/span> w)<\/span>
\n y =<\/span> min<\/span>(<\/span>max<\/span>(<\/span>r.<\/span>y(<\/span>)<\/span>,<\/span> 0.0<\/span>)<\/span>,<\/span> fh –<\/span> h)<\/span>
\n return<\/span> QRectF(<\/span>x,<\/span> y,<\/span> w,<\/span> h)<\/span><\/p>\n

def<\/span> _rect_from_anchor<\/span>(<\/span>self,<\/span> anchor:<\/span> QPointF,<\/span> pt:<\/span> QPointF)<\/span> –<\/span>><\/span> QRectF:<\/span>
\n """\u4ee5 anchor \u4e3a\u56fa\u5b9a\u89d2，pt \u4e3a\u62d6\u52a8\u89d2\u6784\u9020\u77e9\u5f62（\u53ef\u9501\u5b9a\u6bd4\u4f8b）"""<\/span>
\n dx =<\/span> pt.<\/span>x(<\/span>)<\/span> –<\/span> anchor.<\/span>x(<\/span>)<\/span>
\n dy =<\/span> pt.<\/span>y(<\/span>)<\/span> –<\/span> anchor.<\/span>y(<\/span>)<\/span>
\n w,<\/span> h =<\/span> abs<\/span>(<\/span>dx)<\/span>,<\/span> abs<\/span>(<\/span>dy)<\/span><\/p>\n

if<\/span> self.<\/span>_lock_aspect and<\/span> self.<\/span>_aspect ><\/span> 0<\/span>:<\/span>
\n if<\/span> w <<\/span> 1e-6<\/span> and<\/span> h <<\/span> 1e-6<\/span>:<\/span>
\n w =<\/span> h =<\/span> self.<\/span>MIN_SIZE
\n elif<\/span> w \/<\/span> max<\/span>(<\/span>h,<\/span> 1e-6<\/span>)<\/span> ><\/span> self.<\/span>_aspect:<\/span>
\n h =<\/span> w \/<\/span> self.<\/span>_aspect
\n else<\/span>:<\/span>
\n w =<\/span> h *<\/span> self.<\/span>_aspect
\n w =<\/span> max<\/span>(<\/span>w,<\/span> 1.0<\/span>)<\/span>
\n h =<\/span> max<\/span>(<\/span>h,<\/span> 1.0<\/span>)<\/span><\/p>\n

x =<\/span> anchor.<\/span>x(<\/span>)<\/span> if<\/span> dx >=<\/span> 0<\/span> else<\/span> anchor.<\/span>x(<\/span>)<\/span> –<\/span> w
\n y =<\/span> anchor.<\/span>y(<\/span>)<\/span> if<\/span> dy >=<\/span> 0<\/span> else<\/span> anchor.<\/span>y(<\/span>)<\/span> –<\/span> h
\n return<\/span> self.<\/span>_clamp_rect(<\/span>QRectF(<\/span>x,<\/span> y,<\/span> w,<\/span> h)<\/span>)<\/span><\/p>\n

def<\/span> _hit_handle<\/span>(<\/span>self,<\/span> pos:<\/span> QPointF,<\/span> cr:<\/span> QRectF)<\/span>:<\/span>
\n if<\/span> cr.<\/span>isNull(<\/span>)<\/span>:<\/span>
\n return<\/span> None<\/span>
\n corners =<\/span> {<\/span>
\n 'tl'<\/span>:<\/span> cr.<\/span>topLeft(<\/span>)<\/span>,<\/span> 'tr'<\/span>:<\/span> cr.<\/span>topRight(<\/span>)<\/span>,<\/span>
\n 'bl'<\/span>:<\/span> cr.<\/span>bottomLeft(<\/span>)<\/span>,<\/span> 'br'<\/span>:<\/span> cr.<\/span>bottomRight(<\/span>)<\/span>,<\/span>
\n }<\/span>
\n for<\/span> key,<\/span> p in<\/span> corners.<\/span>items(<\/span>)<\/span>:<\/span>
\n if<\/span> abs<\/span>(<\/span>p.<\/span>x(<\/span>)<\/span> –<\/span> pos.<\/span>x(<\/span>)<\/span>)<\/span> <=<\/span> self.<\/span>HANDLE_HIT and<\/span> \\\\
\n abs<\/span>(<\/span>p.<\/span>y(<\/span>)<\/span> –<\/span> pos.<\/span>y(<\/span>)<\/span>)<\/span> <=<\/span> self.<\/span>HANDLE_HIT:<\/span>
\n return<\/span> key
\n return<\/span> None<\/span><\/p>\n

def<\/span> _opposite_corner<\/span>(<\/span>self,<\/span> key:<\/span> str<\/span>)<\/span> –<\/span>><\/span> QPointF:<\/span>
\n c =<\/span> self.<\/span>_crop
\n if<\/span> key ==<\/span> 'tl'<\/span>:<\/span>
\n return<\/span> QPointF(<\/span>c.<\/span>right(<\/span>)<\/span>,<\/span> c.<\/span>bottom(<\/span>)<\/span>)<\/span>
\n if<\/span> key ==<\/span> 'tr'<\/span>:<\/span>
\n return<\/span> QPointF(<\/span>c.<\/span>left(<\/span>)<\/span>,<\/span> c.<\/span>bottom(<\/span>)<\/span>)<\/span>
\n if<\/span> key ==<\/span> 'bl'<\/span>:<\/span>
\n return<\/span> QPointF(<\/span>c.<\/span>right(<\/span>)<\/span>,<\/span> c.<\/span>top(<\/span>)<\/span>)<\/span>
\n return<\/span> QPointF(<\/span>c.<\/span>left(<\/span>)<\/span>,<\/span> c.<\/span>top(<\/span>)<\/span>)<\/span><\/p>\n

# —————- \u9f20\u6807\u4e8b\u4ef6 —————-<\/span>
\n def<\/span> mousePressEvent<\/span>(<\/span>self,<\/span> event)<\/span>:<\/span>
\n if<\/span> self.<\/span>_pixmap is<\/span> None<\/span> or<\/span> event.<\/span>button(<\/span>)<\/span> !=<\/span> Qt.<\/span>LeftButton:<\/span>
\n return<\/span>
\n pos =<\/span> QPointF(<\/span>event.<\/span>pos(<\/span>)<\/span>)<\/span>
\n fpt =<\/span> self.<\/span>_clamp_point(<\/span>self.<\/span>_to_frame(<\/span>pos)<\/span>)<\/span>
\n cr =<\/span> self.<\/span>_crop_view_rect(<\/span>)<\/span><\/p>\n

self.<\/span>_crop_before_drag =<\/span> QRectF(<\/span>self.<\/span>_crop)<\/span> if<\/span> self.<\/span>_crop else<\/span> None<\/span><\/p>\n

handle =<\/span> self.<\/span>_hit_handle(<\/span>pos,<\/span> cr)<\/span>
\n if<\/span> handle is<\/span> not<\/span> None<\/span> and<\/span> self.<\/span>_crop is<\/span> not<\/span> None<\/span>:<\/span>
\n self.<\/span>_mode =<\/span> 'resize'<\/span>
\n self.<\/span>_anchor =<\/span> self.<\/span>_opposite_corner(<\/span>handle)<\/span>
\n elif<\/span> self.<\/span>_crop is<\/span> not<\/span> None<\/span> and<\/span> cr.<\/span>contains(<\/span>pos)<\/span>:<\/span>
\n self.<\/span>_mode =<\/span> 'move'<\/span>
\n self.<\/span>_drag_origin =<\/span> fpt
\n self.<\/span>_crop_at_press =<\/span> QRectF(<\/span>self.<\/span>_crop)<\/span>
\n else<\/span>:<\/span>
\n self.<\/span>_mode =<\/span> 'new'<\/span>
\n self.<\/span>_anchor =<\/span> fpt
\n self.<\/span>_crop =<\/span> QRectF(<\/span>self.<\/span>_anchor,<\/span> self.<\/span>_anchor)<\/span>
\n self.<\/span>update(<\/span>)<\/span><\/p>\n

def<\/span> mouseMoveEvent<\/span>(<\/span>self,<\/span> event)<\/span>:<\/span>
\n if<\/span> self.<\/span>_pixmap is<\/span> None<\/span>:<\/span>
\n return<\/span>
\n pos =<\/span> QPointF(<\/span>event.<\/span>pos(<\/span>)<\/span>)<\/span>
\n fpt =<\/span> self.<\/span>_clamp_point(<\/span>self.<\/span>_to_frame(<\/span>pos)<\/span>)<\/span><\/p>\n

if<\/span> self.<\/span>_mode ==<\/span> 'new'<\/span> or<\/span> self.<\/span>_mode ==<\/span> 'resize'<\/span>:<\/span>
\n self.<\/span>_crop =<\/span> self.<\/span>_rect_from_anchor(<\/span>self.<\/span>_anchor,<\/span> fpt)<\/span>
\n self.<\/span>cropChanged.<\/span>emit(<\/span>QRectF(<\/span>self.<\/span>_crop)<\/span>)<\/span>
\n self.<\/span>update(<\/span>)<\/span>
\n elif<\/span> self.<\/span>_mode ==<\/span> 'move'<\/span> and<\/span> self.<\/span>_crop_at_press is<\/span> not<\/span> None<\/span>:<\/span>
\n delta =<\/span> fpt –<\/span> self.<\/span>_drag_origin
\n r =<\/span> QRectF(<\/span>self.<\/span>_crop_at_press)<\/span>
\n r.<\/span>translate(<\/span>delta)<\/span>
\n fw,<\/span> fh =<\/span> self.<\/span>_frame_size
\n x =<\/span> min<\/span>(<\/span>max<\/span>(<\/span>r.<\/span>x(<\/span>)<\/span>,<\/span> 0.0<\/span>)<\/span>,<\/span> fw –<\/span> r.<\/span>width(<\/span>)<\/span>)<\/span>
\n y =<\/span> min<\/span>(<\/span>max<\/span>(<\/span>r.<\/span>y(<\/span>)<\/span>,<\/span> 0.0<\/span>)<\/span>,<\/span> fh –<\/span> r.<\/span>height(<\/span>)<\/span>)<\/span>
\n r.<\/span>moveTo(<\/span>x,<\/span> y)<\/span>
\n self.<\/span>_crop =<\/span> r
\n self.<\/span>cropChanged.<\/span>emit(<\/span>QRectF(<\/span>self.<\/span>_crop)<\/span>)<\/span>
\n self.<\/span>update(<\/span>)<\/span>
\n else<\/span>:<\/span>
\n cr =<\/span> self.<\/span>_crop_view_rect(<\/span>)<\/span>
\n if<\/span> self.<\/span>_crop is<\/span> not<\/span> None<\/span> and<\/span> self.<\/span>_hit_handle(<\/span>pos,<\/span> cr)<\/span>:<\/span>
\n self.<\/span>setCursor(<\/span>Qt.<\/span>SizeFDiagCursor)<\/span>
\n elif<\/span> self.<\/span>_crop is<\/span> not<\/span> None<\/span> and<\/span> cr.<\/span>contains(<\/span>pos)<\/span>:<\/span>
\n self.<\/span>setCursor(<\/span>Qt.<\/span>SizeAllCursor)<\/span>
\n else<\/span>:<\/span>
\n self.<\/span>setCursor(<\/span>Qt.<\/span>CrossCursor)<\/span><\/p>\n

def<\/span> mouseReleaseEvent<\/span>(<\/span>self,<\/span> event)<\/span>:<\/span>
\n if<\/span> self.<\/span>_mode is<\/span> None<\/span>:<\/span>
\n return<\/span>
\n if<\/span> self.<\/span>_mode in<\/span> (<\/span>'new'<\/span>,<\/span> 'resize'<\/span>)<\/span>:<\/span>
\n if<\/span> (<\/span>self.<\/span>_crop is<\/span> None<\/span> or<\/span>
\n self.<\/span>_crop.<\/span>width(<\/span>)<\/span> <<\/span> self.<\/span>MIN_SIZE or<\/span>
\n self.<\/span>_crop.<\/span>height(<\/span>)<\/span> <<\/span> self.<\/span>MIN_SIZE)<\/span>:<\/span>
\n if<\/span> self.<\/span>_crop_before_drag is<\/span> not<\/span> None<\/span>:<\/span>
\n self.<\/span>_crop =<\/span> self.<\/span>_crop_before_drag
\n else<\/span>:<\/span>
\n self.<\/span>_init_crop(<\/span>)<\/span>
\n self.<\/span>cropChanged.<\/span>emit(<\/span>QRectF(<\/span>self.<\/span>_crop)<\/span>)<\/span>
\n self.<\/span>_mode =<\/span> None<\/span>
\n self.<\/span>_crop_at_press =<\/span> None<\/span>
\n self.<\/span>_crop_before_drag =<\/span> None<\/span>
\n self.<\/span>update(<\/span>)<\/span><\/p>\n

# —————- \u7ed8\u5236 —————-<\/span>
\n def<\/span> paintEvent<\/span>(<\/span>self,<\/span> event)<\/span>:<\/span>
\n painter =<\/span> QPainter(<\/span>self)<\/span>
\n painter.<\/span>setRenderHint(<\/span>QPainter.<\/span>Antialiasing,<\/span> True<\/span>)<\/span>
\n painter.<\/span>fillRect(<\/span>self.<\/span>rect(<\/span>)<\/span>,<\/span> QColor(<\/span>24<\/span>,<\/span> 24<\/span>,<\/span> 27<\/span>)<\/span>)<\/span><\/p>\n

if<\/span> self.<\/span>_pixmap is<\/span> None<\/span>:<\/span>
\n painter.<\/span>setPen(<\/span>QColor(<\/span>170<\/span>,<\/span> 170<\/span>,<\/span> 170<\/span>)<\/span>)<\/span>
\n painter.<\/span>drawText(<\/span>self.<\/span>rect(<\/span>)<\/span>,<\/span> Qt.<\/span>AlignCenter,<\/span>
\n "\u8bf7\u5148\u6253\u5f00\u4e00\u4e2a\u89c6\u9891\u6587\u4ef6\\\\n（\u5de5\u5177\u680f \u2192 \u6253\u5f00\u89c6\u9891）"<\/span>)<\/span>
\n return<\/span><\/p>\n

vr =<\/span> self.<\/span>_view_rect(<\/span>)<\/span>
\n painter.<\/span>drawPixmap(<\/span>vr,<\/span> self.<\/span>_pixmap,<\/span> QRectF(<\/span>self.<\/span>_pixmap.<\/span>rect(<\/span>)<\/span>)<\/span>)<\/span><\/p>\n

if<\/span> self.<\/span>_crop is<\/span> None<\/span>:<\/span>
\n return<\/span><\/p>\n

cr =<\/span> self.<\/span>_crop_view_rect(<\/span>)<\/span><\/p>\n

# \u9009\u533a\u5916\u906e\u7f69<\/span>
\n path =<\/span> QPainterPath(<\/span>)<\/span>
\n path.<\/span>setFillRule(<\/span>Qt.<\/span>OddEvenFill)<\/span>
\n path.<\/span>addRect(<\/span>vr)<\/span>
\n path.<\/span>addRect(<\/span>cr)<\/span>
\n painter.<\/span>fillPath(<\/span>path,<\/span> QColor(<\/span>0<\/span>,<\/span> 0<\/span>,<\/span> 0<\/span>,<\/span> 150<\/span>)<\/span>)<\/span><\/p>\n

# \u4e09\u5206\u53c2\u8003\u7ebf<\/span>
\n painter.<\/span>setPen(<\/span>QPen(<\/span>QColor(<\/span>255<\/span>,<\/span> 255<\/span>,<\/span> 255<\/span>,<\/span> 60<\/span>)<\/span>,<\/span> 1<\/span>)<\/span>)<\/span>
\n for<\/span> i in<\/span> (<\/span>1<\/span>,<\/span> 2<\/span>)<\/span>:<\/span>
\n x =<\/span> cr.<\/span>left(<\/span>)<\/span> +<\/span> cr.<\/span>width(<\/span>)<\/span> *<\/span> i \/<\/span> 3.0<\/span>
\n painter.<\/span>drawLine(<\/span>QPointF(<\/span>x,<\/span> cr.<\/span>top(<\/span>)<\/span>)<\/span>,<\/span> QPointF(<\/span>x,<\/span> cr.<\/span>bottom(<\/span>)<\/span>)<\/span>)<\/span>
\n y =<\/span> cr.<\/span>top(<\/span>)<\/span> +<\/span> cr.<\/span>height(<\/span>)<\/span> *<\/span> i \/<\/span> 3.0<\/span>
\n painter.<\/span>drawLine(<\/span>QPointF(<\/span>cr.<\/span>left(<\/span>)<\/span>,<\/span> y)<\/span>,<\/span> QPointF(<\/span>cr.<\/span>right(<\/span>)<\/span>,<\/span> y)<\/span>)<\/span><\/p>\n

# \u8fb9\u6846<\/span>
\n painter.<\/span>setPen(<\/span>QPen(<\/span>QColor(<\/span>0<\/span>,<\/span> 200<\/span>,<\/span> 255<\/span>)<\/span>,<\/span> 2<\/span>)<\/span>)<\/span>
\n painter.<\/span>setBrush(<\/span>Qt.<\/span>NoBrush)<\/span>
\n painter.<\/span>drawRect(<\/span>cr)<\/span><\/p>\n

# \u89d2\u70b9\u624b\u67c4<\/span>
\n hs =<\/span> self.<\/span>HANDLE_SIZE
\n painter.<\/span>setBrush(<\/span>QColor(<\/span>0<\/span>,<\/span> 200<\/span>,<\/span> 255<\/span>)<\/span>)<\/span>
\n painter.<\/span>setPen(<\/span>QPen(<\/span>QColor(<\/span>255<\/span>,<\/span> 255<\/span>,<\/span> 255<\/span>)<\/span>,<\/span> 1<\/span>)<\/span>)<\/span>
\n for<\/span> p in<\/span> (<\/span>cr.<\/span>topLeft(<\/span>)<\/span>,<\/span> cr.<\/span>topRight(<\/span>)<\/span>,<\/span> cr.<\/span>bottomLeft(<\/span>)<\/span>,<\/span> cr.<\/span>bottomRight(<\/span>)<\/span>)<\/span>:<\/span>
\n painter.<\/span>drawRect(<\/span>QRectF(<\/span>p.<\/span>x(<\/span>)<\/span> –<\/span> hs \/<\/span> 2.0<\/span>,<\/span> p.<\/span>y(<\/span>)<\/span> –<\/span> hs \/<\/span> 2.0<\/span>,<\/span> hs,<\/span> hs)<\/span>)<\/span><\/p>\n

# \u5c3a\u5bf8\u6587\u5b57<\/span>
\n txt =<\/span> "%d \u00d7 %d"<\/span> %<\/span> (<\/span>int<\/span>(<\/span>round<\/span>(<\/span>self.<\/span>_crop.<\/span>width(<\/span>)<\/span>)<\/span>)<\/span>,<\/span>
\n int<\/span>(<\/span>round<\/span>(<\/span>self.<\/span>_crop.<\/span>height(<\/span>)<\/span>)<\/span>)<\/span>)<\/span>
\n painter.<\/span>setPen(<\/span>QColor(<\/span>255<\/span>,<\/span> 235<\/span>,<\/span> 59<\/span>)<\/span>)<\/span>
\n painter.<\/span>drawText(<\/span>QPointF(<\/span>cr.<\/span>left(<\/span>)<\/span>,<\/span> max<\/span>(<\/span>cr.<\/span>top(<\/span>)<\/span> –<\/span> 7<\/span>,<\/span> 12<\/span>)<\/span>)<\/span>,<\/span> txt)<\/span><\/p>\n

def<\/span> resizeEvent<\/span>(<\/span>self,<\/span> event)<\/span>:<\/span>
\n super<\/span>(<\/span>)<\/span>.<\/span>resizeEvent(<\/span>event)<\/span>
\n self.<\/span>update(<\/span>)<\/span><\/p>\n

# ————————————————————————— #<\/span>
\n# \u540e\u53f0\u5bfc\u51fa\u7ebf\u7a0b \u2014\u2014 ffmpeg \u7248（\u4fdd\u7559\u97f3\u9891）<\/span>
\n# ————————————————————————— #<\/span>
\nclass<\/span> FfmpegCropWorker<\/span>(<\/span>QThread)<\/span>:<\/span>
\n """\u7528 ffmpeg \u4e00\u6b65\u5b8c\u6210\u88c1\u526a + \u4fdd\u7559\u97f3\u8f68"""<\/span>
\n progressChanged =<\/span> pyqtSignal(<\/span>int<\/span>)<\/span>
\n finishedOk =<\/span> pyqtSignal(<\/span>str<\/span>)<\/span>
\n failed =<\/span> pyqtSignal(<\/span>str<\/span>)<\/span>
\n cancelled =<\/span> pyqtSignal(<\/span>)<\/span><\/p>\n

def<\/span> __init__<\/span>(<\/span>self,<\/span> src,<\/span> dst,<\/span> rect,<\/span> duration,<\/span> ffmpeg,<\/span> parent=<\/span>None<\/span>)<\/span>:<\/span>
\n super<\/span>(<\/span>)<\/span>.<\/span>__init__(<\/span>parent)<\/span>
\n self.<\/span>src =<\/span> src
\n self.<\/span>dst =<\/span> dst
\n self.<\/span>x,<\/span> self.<\/span>y,<\/span> self.<\/span>w,<\/span> self.<\/span>h =<\/span> rect
\n self.<\/span>duration =<\/span> duration # \u79d2，\u7528\u4e8e\u8fdb\u5ea6\u8ba1\u7b97<\/span>
\n self.<\/span>ffmpeg =<\/span> ffmpeg
\n self.<\/span>_proc =<\/span> None<\/span>
\n self.<\/span>_cancel =<\/span> False<\/span><\/p>\n

def<\/span> cancel<\/span>(<\/span>self)<\/span>:<\/span>
\n self.<\/span>_cancel =<\/span> True<\/span>
\n if<\/span> self.<\/span>_proc is<\/span> not<\/span> None<\/span>:<\/span>
\n try<\/span>:<\/span>
\n self.<\/span>_proc.<\/span>terminate(<\/span>)<\/span>
\n except<\/span> Exception:<\/span>
\n pass<\/span><\/p>\n

def<\/span> run<\/span>(<\/span>self)<\/span>:<\/span>
\n cmd =<\/span> [<\/span>
\n self.<\/span>ffmpeg,<\/span> "-y"<\/span>,<\/span> "-hide_banner"<\/span>,<\/span>
\n "-i"<\/span>,<\/span> self.<\/span>src,<\/span>
\n "-vf"<\/span>,<\/span> f"crop=<\/span>{<\/span>self.<\/span>w}<\/span><\/span>:<\/span>{<\/span>self.<\/span>h}<\/span><\/span>:<\/span>{<\/span>self.<\/span>x}<\/span><\/span>:<\/span>{<\/span>self.<\/span>y}<\/span><\/span>"<\/span><\/span>,<\/span>
\n "-c:v"<\/span>,<\/span> "libx264"<\/span>,<\/span> "-crf"<\/span>,<\/span> "18"<\/span>,<\/span> "-preset"<\/span>,<\/span> "medium"<\/span>,<\/span>
\n "-pix_fmt"<\/span>,<\/span> "yuv420p"<\/span>,<\/span>
\n "-c:a"<\/span>,<\/span> "aac"<\/span>,<\/span> "-b:a"<\/span>,<\/span> "192k"<\/span>,<\/span>
\n "-movflags"<\/span>,<\/span> "+faststart"<\/span>,<\/span>
\n "-progress"<\/span>,<\/span> "pipe:1"<\/span>,<\/span>
\n self.<\/span>dst,<\/span>
\n ]<\/span>
\n try<\/span>:<\/span>
\n # \u5173\u952e：stderr \u5408\u5e76\u5230 stdout，\u907f\u514d\u7ba1\u9053\u5199\u6ee1\u5bfc\u81f4\u6b7b\u9501<\/span>
\n self.<\/span>_proc =<\/span> subprocess.<\/span>Popen(<\/span>
\n cmd,<\/span>
\n stdout=<\/span>subprocess.<\/span>PIPE,<\/span>
\n stderr=<\/span>subprocess.<\/span>STDOUT,<\/span>
\n universal_newlines=<\/span>True<\/span>,<\/span>
\n encoding=<\/span>"utf-8"<\/span>,<\/span>
\n errors=<\/span>"ignore"<\/span>,<\/span>
\n )<\/span><\/p>\n

error_lines =<\/span> [<\/span>]<\/span>
\n assert<\/span> self.<\/span>_proc.<\/span>stdout is<\/span> not<\/span> None<\/span>
\n for<\/span> line in<\/span> self.<\/span>_proc.<\/span>stdout:<\/span>
\n if<\/span> self.<\/span>_cancel:<\/span>
\n break<\/span>
\n line =<\/span> line.<\/span>strip(<\/span>)<\/span>
\n if<\/span> not<\/span> line:<\/span>
\n continue<\/span><\/p>\n

if<\/span> line.<\/span>startswith(<\/span>"out_time_us="<\/span>)<\/span> or<\/span> line.<\/span>startswith(<\/span>"out_time_ms="<\/span>)<\/span>:<\/span>
\n try<\/span>:<\/span>
\n us =<\/span> int<\/span>(<\/span>line.<\/span>split(<\/span>"="<\/span>,<\/span> 1<\/span>)<\/span>[<\/span>1<\/span>]<\/span>)<\/span>
\n sec =<\/span> us \/<\/span> 1_000_000.0<\/span>
\n if<\/span> self.<\/span>duration ><\/span> 0<\/span>:<\/span>
\n pct =<\/span> int<\/span>(<\/span>sec \/<\/span> self.<\/span>duration *<\/span> 100<\/span>)<\/span>
\n self.<\/span>progressChanged.<\/span>emit(<\/span>min<\/span>(<\/span>99<\/span>,<\/span> max<\/span>(<\/span>0<\/span>,<\/span> pct)<\/span>)<\/span>)<\/span>
\n except<\/span> ValueError:<\/span>
\n pass<\/span>
\n else<\/span>:<\/span>
\n # \u975e\u8fdb\u5ea6\u884c\u6536\u96c6\u8d77\u6765，\u5931\u8d25\u65f6\u7528\u4e8e\u63d0\u793a<\/span>
\n error_lines.<\/span>append(<\/span>line)<\/span>
\n if<\/span> len<\/span>(<\/span>error_lines)<\/span> ><\/span> 50<\/span>:<\/span>
\n error_lines.<\/span>pop(<\/span>0<\/span>)<\/span><\/p>\n

rc =<\/span> self.<\/span>_proc.<\/span>wait(<\/span>)<\/span>
\n self.<\/span>_proc =<\/span> None<\/span><\/p>\n

if<\/span> self.<\/span>_cancel:<\/span>
\n try<\/span>:<\/span>
\n if<\/span> os.<\/span>path.<\/span>exists(<\/span>self.<\/span>dst)<\/span>:<\/span>
\n os.<\/span>remove(<\/span>self.<\/span>dst)<\/span>
\n except<\/span> Exception:<\/span>
\n pass<\/span>
\n self.<\/span>cancelled.<\/span>emit(<\/span>)<\/span>
\n return<\/span><\/p>\n

if<\/span> rc !=<\/span> 0<\/span>:<\/span>
\n tail =<\/span> error_lines[<\/span>–<\/span>10<\/span>:<\/span>]<\/span> if<\/span> error_lines else<\/span> [<\/span>"(\u65e0\u8be6\u7ec6\u9519\u8bef\u4fe1\u606f)"<\/span>]<\/span>
\n self.<\/span>failed.<\/span>emit(<\/span>"ffmpeg \u5bfc\u51fa\u5931\u8d25（\u8fd4\u56de\u7801 %d）：\\\\n%s"<\/span>
\n %<\/span> (<\/span>rc,<\/span> "\\\\n"<\/span>.<\/span>join(<\/span>tail)<\/span>)<\/span>)<\/span>
\n return<\/span><\/p>\n

self.<\/span>progressChanged.<\/span>emit(<\/span>100<\/span>)<\/span>
\n self.<\/span>finishedOk.<\/span>emit(<\/span>self.<\/span>dst)<\/span><\/p>\n

except<\/span> Exception as<\/span> exc:<\/span> # noqa: BLE001<\/span>
\n self.<\/span>failed.<\/span>emit(<\/span>str<\/span>(<\/span>exc)<\/span>)<\/span><\/p>\n

# ————————————————————————— #<\/span>
\n# \u540e\u53f0\u5bfc\u51fa\u7ebf\u7a0b \u2014\u2014 OpenCV \u7248（\u65e0\u97f3\u9891，\u4f5c\u4e3a ffmpeg \u4e0d\u53ef\u7528\u65f6\u7684\u5907\u7528）<\/span>
\n# ————————————————————————— #<\/span>
\nclass<\/span> CropSaveWorker<\/span>(<\/span>QThread)<\/span>:<\/span>
\n progressChanged =<\/span> pyqtSignal(<\/span>int<\/span>)<\/span>
\n finishedOk =<\/span> pyqtSignal(<\/span>str<\/span>)<\/span>
\n failed =<\/span> pyqtSignal(<\/span>str<\/span>)<\/span>
\n cancelled =<\/span> pyqtSignal(<\/span>)<\/span><\/p>\n

def<\/span> __init__<\/span>(<\/span>self,<\/span> src,<\/span> dst,<\/span> rect,<\/span> fps,<\/span> parent=<\/span>None<\/span>)<\/span>:<\/span>
\n super<\/span>(<\/span>)<\/span>.<\/span>__init__(<\/span>parent)<\/span>
\n self.<\/span>src =<\/span> src
\n self.<\/span>dst =<\/span> dst
\n self.<\/span>x,<\/span> self.<\/span>y,<\/span> self.<\/span>w,<\/span> self.<\/span>h =<\/span> rect
\n self.<\/span>fps =<\/span> fps if<\/span> fps and<\/span> fps ><\/span> 0<\/span> else<\/span> 25.0<\/span>
\n self.<\/span>_cancel =<\/span> False<\/span><\/p>\n

def<\/span> cancel<\/span>(<\/span>self)<\/span>:<\/span>
\n self.<\/span>_cancel =<\/span> True<\/span><\/p>\n

def<\/span> run<\/span>(<\/span>self)<\/span>:<\/span>
\n cap =<\/span> None<\/span>
\n writer =<\/span> None<\/span>
\n try<\/span>:<\/span>
\n cap =<\/span> cv2.<\/span>VideoCapture(<\/span>self.<\/span>src)<\/span>
\n if<\/span> not<\/span> cap.<\/span>isOpened(<\/span>)<\/span>:<\/span>
\n self.<\/span>failed.<\/span>emit(<\/span>"\u65e0\u6cd5\u6253\u5f00\u6e90\u89c6\u9891\u6587\u4ef6"<\/span>)<\/span>
\n return<\/span><\/p>\n

total =<\/span> int<\/span>(<\/span>cap.<\/span>get(<\/span>cv2.<\/span>CAP_PROP_FRAME_COUNT)<\/span>)<\/span>
\n if<\/span> total <=<\/span> 0<\/span>:<\/span>
\n total =<\/span> 1<\/span><\/p>\n

ext =<\/span> os.<\/span>path.<\/span>splitext(<\/span>self.<\/span>dst)<\/span>[<\/span>1<\/span>]<\/span>.<\/span>lower(<\/span>)<\/span>
\n fourcc =<\/span> (<\/span>cv2.<\/span>VideoWriter_fourcc(<\/span>*<\/span>'XVID'<\/span>)<\/span> if<\/span> ext ==<\/span> '.avi'<\/span>
\n else<\/span> cv2.<\/span>VideoWriter_fourcc(<\/span>*<\/span>'mp4v'<\/span>)<\/span>)<\/span><\/p>\n

writer =<\/span> cv2.<\/span>VideoWriter(<\/span>self.<\/span>dst,<\/span> fourcc,<\/span> self.<\/span>fps,<\/span> (<\/span>self.<\/span>w,<\/span> self.<\/span>h)<\/span>)<\/span>
\n if<\/span> not<\/span> writer.<\/span>isOpened(<\/span>)<\/span>:<\/span>
\n self.<\/span>failed.<\/span>emit(<\/span>"\u65e0\u6cd5\u521b\u5efa\u8f93\u51fa\u6587\u4ef6（\u7f16\u7801\u5668\u6216\u4fdd\u5b58\u8def\u5f84\u4e0d\u53ef\u7528）"<\/span>)<\/span>
\n return<\/span><\/p>\n

idx =<\/span> 0<\/span>
\n while<\/span> True<\/span>:<\/span>
\n if<\/span> self.<\/span>_cancel:<\/span>
\n break<\/span>
\n ok,<\/span> frame =<\/span> cap.<\/span>read(<\/span>)<\/span>
\n if<\/span> not<\/span> ok:<\/span>
\n break<\/span><\/p>\n

crop =<\/span> frame[<\/span>self.<\/span>y:<\/span>self.<\/span>y +<\/span> self.<\/span>h,<\/span> self.<\/span>x:<\/span>self.<\/span>x +<\/span> self.<\/span>w]<\/span>
\n if<\/span> crop.<\/span>shape[<\/span>0<\/span>]<\/span> !=<\/span> self.<\/span>h or<\/span> crop.<\/span>shape[<\/span>1<\/span>]<\/span> !=<\/span> self.<\/span>w:<\/span>
\n crop =<\/span> cv2.<\/span>resize(<\/span>crop,<\/span> (<\/span>self.<\/span>w,<\/span> self.<\/span>h)<\/span>)<\/span>
\n writer.<\/span>write(<\/span>crop)<\/span><\/p>\n

idx +=<\/span> 1<\/span>
\n if<\/span> idx %<\/span> 3<\/span> ==<\/span> 0<\/span>:<\/span>
\n self.<\/span>progressChanged.<\/span>emit(<\/span>min<\/span>(<\/span>99<\/span>,<\/span> int<\/span>(<\/span>idx *<\/span> 100<\/span> \/<\/span> total)<\/span>)<\/span>)<\/span><\/p>\n

writer.<\/span>release(<\/span>)<\/span>
\n writer =<\/span> None<\/span>
\n cap.<\/span>release(<\/span>)<\/span>
\n cap =<\/span> None<\/span><\/p>\n

if<\/span> self.<\/span>_cancel:<\/span>
\n self.<\/span>cancelled.<\/span>emit(<\/span>)<\/span>
\n return<\/span><\/p>\n

self.<\/span>progressChanged.<\/span>emit(<\/span>100<\/span>)<\/span>
\n self.<\/span>finishedOk.<\/span>emit(<\/span>self.<\/span>dst)<\/span><\/p>\n

except<\/span> Exception as<\/span> exc:<\/span> # noqa: BLE001<\/span>
\n self.<\/span>failed.<\/span>emit(<\/span>str<\/span>(<\/span>exc)<\/span>)<\/span>
\n finally<\/span>:<\/span>
\n if<\/span> writer is<\/span> not<\/span> None<\/span>:<\/span>
\n writer.<\/span>release(<\/span>)<\/span>
\n if<\/span> cap is<\/span> not<\/span> None<\/span>:<\/span>
\n cap.<\/span>release(<\/span>)<\/span><\/p>\n

# ————————————————————————— #<\/span>
\n# \u4e3b\u7a97\u53e3<\/span>
\n# ————————————————————————— #<\/span>
\nclass<\/span> MainWindow<\/span>(<\/span>QMainWindow)<\/span>:<\/span><\/p>\n

def<\/span> __init__<\/span>(<\/span>self)<\/span>:<\/span>
\n super<\/span>(<\/span>)<\/span>.<\/span>__init__(<\/span>)<\/span>
\n self.<\/span>setWindowTitle(<\/span>"\u89c6\u9891\u753b\u9762\u88c1\u526a\u5de5\u5177 \u2014 \u9884\u89c8 \/ \u6846\u9009 \/ \u4fdd\u5b58（\u4fdd\u7559\u97f3\u9891）"<\/span>)<\/span>
\n self.<\/span>resize(<\/span>1120<\/span>,<\/span> 760<\/span>)<\/span><\/p>\n

self.<\/span>cap =<\/span> None<\/span>
\n self.<\/span>video_path =<\/span> None<\/span>
\n self.<\/span>fps =<\/span> 25.0<\/span>
\n self.<\/span>frame_count =<\/span> 0<\/span>
\n self.<\/span>fw =<\/span> 0<\/span>
\n self.<\/span>fh =<\/span> 0<\/span>
\n self.<\/span>current_index =<\/span> 0<\/span>
\n self.<\/span>is_playing =<\/span> False<\/span>
\n self.<\/span>_seeking =<\/span> False<\/span><\/p>\n

self.<\/span>timer =<\/span> QTimer(<\/span>self)<\/span>
\n self.<\/span>timer.<\/span>timeout.<\/span>connect(<\/span>self.<\/span>_on_timer)<\/span><\/p>\n

self.<\/span>worker =<\/span> None<\/span>
\n self.<\/span>progress_dlg =<\/span> None<\/span><\/p>\n

self.<\/span>_build_ui(<\/span>)<\/span><\/p>\n

# —————- UI —————-<\/span>
\n def<\/span> _build_ui<\/span>(<\/span>self)<\/span>:<\/span>
\n toolbar =<\/span> QToolBar(<\/span>"\u4e3b\u5de5\u5177\u680f"<\/span>,<\/span> self)<\/span>
\n toolbar.<\/span>setMovable(<\/span>False<\/span>)<\/span>
\n self.<\/span>addToolBar(<\/span>toolbar)<\/span><\/p>\n

act_open =<\/span> QAction(<\/span>"\u6253\u5f00\u89c6\u9891"<\/span>,<\/span> self)<\/span>
\n act_open.<\/span>triggered.<\/span>connect(<\/span>self.<\/span>open_video)<\/span>
\n toolbar.<\/span>addAction(<\/span>act_open)<\/span><\/p>\n

toolbar.<\/span>addSeparator(<\/span>)<\/span><\/p>\n

self.<\/span>act_play =<\/span> QAction(<\/span>"\u64ad\u653e"<\/span>,<\/span> self)<\/span>
\n self.<\/span>act_play.<\/span>setEnabled(<\/span>False<\/span>)<\/span>
\n self.<\/span>act_play.<\/span>triggered.<\/span>connect(<\/span>self.<\/span>toggle_play)<\/span>
\n toolbar.<\/span>addAction(<\/span>self.<\/span>act_play)<\/span><\/p>\n

self.<\/span>act_reset =<\/span> QAction(<\/span>"\u91cd\u7f6e\u9009\u533a"<\/span>,<\/span> self)<\/span>
\n self.<\/span>act_reset.<\/span>triggered.<\/span>connect(<\/span>lambda<\/span>:<\/span> self.<\/span>canvas.<\/span>reset_crop(<\/span>)<\/span>)<\/span>
\n toolbar.<\/span>addAction(<\/span>self.<\/span>act_reset)<\/span><\/p>\n

toolbar.<\/span>addSeparator(<\/span>)<\/span><\/p>\n

self.<\/span>act_save =<\/span> QAction(<\/span>"\u4fdd\u5b58\u88c1\u526a\u89c6\u9891"<\/span>,<\/span> self)<\/span>
\n self.<\/span>act_save.<\/span>setEnabled(<\/span>False<\/span>)<\/span>
\n self.<\/span>act_save.<\/span>triggered.<\/span>connect(<\/span>self.<\/span>save_video)<\/span>
\n toolbar.<\/span>addAction(<\/span>self.<\/span>act_save)<\/span><\/p>\n

central =<\/span> QWidget(<\/span>self)<\/span>
\n vbox =<\/span> QVBoxLayout(<\/span>central)<\/span>
\n vbox.<\/span>setContentsMargins(<\/span>6<\/span>,<\/span> 6<\/span>,<\/span> 6<\/span>,<\/span> 6<\/span>)<\/span>
\n vbox.<\/span>setSpacing(<\/span>6<\/span>)<\/span><\/p>\n

self.<\/span>canvas =<\/span> CropCanvas(<\/span>self)<\/span>
\n self.<\/span>canvas.<\/span>cropChanged.<\/span>connect(<\/span>self.<\/span>_on_crop_changed)<\/span>
\n vbox.<\/span>addWidget(<\/span>self.<\/span>canvas,<\/span> 1<\/span>)<\/span><\/p>\n

bottom =<\/span> QHBoxLayout(<\/span>)<\/span>
\n bottom.<\/span>setSpacing(<\/span>8<\/span>)<\/span><\/p>\n

self.<\/span>slider =<\/span> QSlider(<\/span>Qt.<\/span>Horizontal,<\/span> self)<\/span>
\n self.<\/span>slider.<\/span>setRange(<\/span>0<\/span>,<\/span> 0<\/span>)<\/span>
\n self.<\/span>slider.<\/span>sliderPressed.<\/span>connect(<\/span>self.<\/span>_on_slider_pressed)<\/span>
\n self.<\/span>slider.<\/span>sliderReleased.<\/span>connect(<\/span>self.<\/span>_on_slider_released)<\/span>
\n self.<\/span>slider.<\/span>valueChanged.<\/span>connect(<\/span>self.<\/span>_on_slider_value)<\/span>
\n bottom.<\/span>addWidget(<\/span>self.<\/span>slider,<\/span> 1<\/span>)<\/span><\/p>\n

self.<\/span>lbl_time =<\/span> QLabel(<\/span>"00:00 \/ 00:00"<\/span>)<\/span>
\n bottom.<\/span>addWidget(<\/span>self.<\/span>lbl_time)<\/span><\/p>\n

self.<\/span>chk_lock =<\/span> QCheckBox(<\/span>"\u9501\u5b9a\u539f\u59cb\u6bd4\u4f8b"<\/span>)<\/span>
\n self.<\/span>chk_lock.<\/span>setChecked(<\/span>True<\/span>)<\/span>
\n self.<\/span>chk_lock.<\/span>toggled.<\/span>connect(<\/span>self.<\/span>canvas.<\/span>set_lock_aspect)<\/span>
\n bottom.<\/span>addWidget(<\/span>self.<\/span>chk_lock)<\/span><\/p>\n

vbox.<\/span>addLayout(<\/span>bottom)<\/span>
\n self.<\/span>setCentralWidget(<\/span>central)<\/span><\/p>\n

self.<\/span>lbl_info =<\/span> QLabel(<\/span>"\u5c31\u7eea"<\/span>)<\/span>
\n self.<\/span>statusBar(<\/span>)<\/span>.<\/span>addPermanentWidget(<\/span>self.<\/span>lbl_info)<\/span><\/p>\n

QShortcut(<\/span>QKeySequence(<\/span>Qt.<\/span>Key_Space)<\/span>,<\/span> self,<\/span> activated=<\/span>self.<\/span>toggle_play)<\/span>
\n QShortcut(<\/span>QKeySequence(<\/span>"Ctrl+O"<\/span>)<\/span>,<\/span> self,<\/span> activated=<\/span>self.<\/span>open_video)<\/span>
\n QShortcut(<\/span>QKeySequence(<\/span>"Ctrl+S"<\/span>)<\/span>,<\/span> self,<\/span> activated=<\/span>self.<\/span>save_video)<\/span><\/p>\n

# —————- \u6253\u5f00\u89c6\u9891 —————-<\/span>
\n def<\/span> open_video<\/span>(<\/span>self)<\/span>:<\/span>
\n path,<\/span> _ =<\/span> QFileDialog.<\/span>getOpenFileName(<\/span>
\n self,<\/span> "\u9009\u62e9\u89c6\u9891\u6587\u4ef6"<\/span>,<\/span> ""<\/span>,<\/span>
\n "\u89c6\u9891\u6587\u4ef6 (*.mp4 *.avi *.mov *.mkv *.flv *.wmv *.webm);;\u6240\u6709\u6587\u4ef6 (*)"<\/span>)<\/span>
\n if<\/span> path:<\/span>
\n self.<\/span>load_video(<\/span>path)<\/span><\/p>\n

def<\/span> load_video<\/span>(<\/span>self,<\/span> path:<\/span> str<\/span>)<\/span>:<\/span>
\n self.<\/span>stop_play(<\/span>)<\/span>
\n if<\/span> self.<\/span>cap is<\/span> not<\/span> None<\/span>:<\/span>
\n self.<\/span>cap.<\/span>release(<\/span>)<\/span>
\n self.<\/span>cap =<\/span> None<\/span><\/p>\n

cap =<\/span> cv2.<\/span>VideoCapture(<\/span>path)<\/span>
\n if<\/span> not<\/span> cap.<\/span>isOpened(<\/span>)<\/span>:<\/span>
\n QMessageBox.<\/span>critical(<\/span>self,<\/span> "\u9519\u8bef"<\/span>,<\/span> "\u65e0\u6cd5\u6253\u5f00\u8be5\u89c6\u9891\u6587\u4ef6\u3002"<\/span>)<\/span>
\n return<\/span><\/p>\n

self.<\/span>cap =<\/span> cap
\n self.<\/span>video_path =<\/span> path<\/p>\n

fps =<\/span> cap.<\/span>get(<\/span>cv2.<\/span>CAP_PROP_FPS)<\/span>
\n self.<\/span>fps =<\/span> fps if<\/span> fps and<\/span> 0<\/span> <<\/span> fps <=<\/span> 240<\/span> else<\/span> 25.0<\/span>
\n self.<\/span>frame_count =<\/span> int<\/span>(<\/span>cap.<\/span>get(<\/span>cv2.<\/span>CAP_PROP_FRAME_COUNT)<\/span>)<\/span> or<\/span> 0<\/span>
\n self.<\/span>fw =<\/span> int<\/span>(<\/span>cap.<\/span>get(<\/span>cv2.<\/span>CAP_PROP_FRAME_WIDTH)<\/span>)<\/span>
\n self.<\/span>fh =<\/span> int<\/span>(<\/span>cap.<\/span>get(<\/span>cv2.<\/span>CAP_PROP_FRAME_HEIGHT)<\/span>)<\/span>
\n self.<\/span>current_index =<\/span> 0<\/span><\/p>\n

self.<\/span>slider.<\/span>blockSignals(<\/span>True<\/span>)<\/span>
\n self.<\/span>slider.<\/span>setRange(<\/span>0<\/span>,<\/span> max<\/span>(<\/span>self.<\/span>frame_count –<\/span> 1<\/span>,<\/span> 0<\/span>)<\/span>)<\/span>
\n self.<\/span>slider.<\/span>setValue(<\/span>0<\/span>)<\/span>
\n self.<\/span>slider.<\/span>blockSignals(<\/span>False<\/span>)<\/span><\/p>\n

self.<\/span>canvas.<\/span>reset_for_new_video(<\/span>self.<\/span>fw,<\/span> self.<\/span>fh)<\/span>
\n self.<\/span>_read_frame_at(<\/span>0<\/span>)<\/span><\/p>\n

self.<\/span>act_play.<\/span>setEnabled(<\/span>True<\/span>)<\/span>
\n self.<\/span>act_play.<\/span>setText(<\/span>"\u64ad\u653e"<\/span>)<\/span>
\n self.<\/span>act_save.<\/span>setEnabled(<\/span>True<\/span>)<\/span><\/p>\n

self.<\/span>statusBar(<\/span>)<\/span>.<\/span>showMessage(<\/span>
\n "\u5df2\u52a0\u8f7d：%s %d\u00d7%d %.2f fps %d \u5e27"<\/span>
\n %<\/span> (<\/span>os.<\/span>path.<\/span>basename(<\/span>path)<\/span>,<\/span> self.<\/span>fw,<\/span> self.<\/span>fh,<\/span> self.<\/span>fps,<\/span> self.<\/span>frame_count)<\/span>,<\/span>
\n 8000<\/span>)<\/span><\/p>\n

# —————- \u64ad\u653e\u63a7\u5236 —————-<\/span>
\n def<\/span> toggle_play<\/span>(<\/span>self)<\/span>:<\/span>
\n if<\/span> self.<\/span>cap is<\/span> None<\/span>:<\/span>
\n return<\/span>
\n self.<\/span>stop_play(<\/span>)<\/span> if<\/span> self.<\/span>is_playing else<\/span> self.<\/span>start_play(<\/span>)<\/span><\/p>\n

def<\/span> start_play<\/span>(<\/span>self)<\/span>:<\/span>
\n if<\/span> self.<\/span>cap is<\/span> None<\/span> or<\/span> self.<\/span>frame_count <=<\/span> 0<\/span>:<\/span>
\n return<\/span>
\n if<\/span> self.<\/span>current_index >=<\/span> self.<\/span>frame_count –<\/span> 1<\/span>:<\/span>
\n self.<\/span>current_index =<\/span> 0<\/span>
\n self.<\/span>cap.<\/span>set<\/span>(<\/span>cv2.<\/span>CAP_PROP_POS_FRAMES,<\/span> 0<\/span>)<\/span>
\n else<\/span>:<\/span>
\n self.<\/span>cap.<\/span>set<\/span>(<\/span>cv2.<\/span>CAP_PROP_POS_FRAMES,<\/span> self.<\/span>current_index +<\/span> 1<\/span>)<\/span>
\n self.<\/span>is_playing =<\/span> True<\/span>
\n self.<\/span>act_play.<\/span>setText(<\/span>"\u6682\u505c"<\/span>)<\/span>
\n self.<\/span>timer.<\/span>start(<\/span>max<\/span>(<\/span>1<\/span>,<\/span> int<\/span>(<\/span>round<\/span>(<\/span>1000.0<\/span> \/<\/span> self.<\/span>fps)<\/span>)<\/span>)<\/span>)<\/span><\/p>\n

def<\/span> stop_play<\/span>(<\/span>self)<\/span>:<\/span>
\n self.<\/span>is_playing =<\/span> False<\/span>
\n self.<\/span>timer.<\/span>stop(<\/span>)<\/span>
\n self.<\/span>act_play.<\/span>setText(<\/span>"\u64ad\u653e"<\/span>)<\/span><\/p>\n

def<\/span> _on_timer<\/span>(<\/span>self)<\/span>:<\/span>
\n if<\/span> self.<\/span>cap is<\/span> None<\/span>:<\/span>
\n return<\/span>
\n ok,<\/span> frame =<\/span> self.<\/span>cap.<\/span>read(<\/span>)<\/span>
\n if<\/span> not<\/span> ok:<\/span>
\n self.<\/span>stop_play(<\/span>)<\/span>
\n return<\/span>
\n self.<\/span>current_index =<\/span> min<\/span>(<\/span>self.<\/span>current_index +<\/span> 1<\/span>,<\/span> max<\/span>(<\/span>self.<\/span>frame_count –<\/span> 1<\/span>,<\/span> 0<\/span>)<\/span>)<\/span>
\n self.<\/span>canvas.<\/span>set_frame(<\/span>frame)<\/span><\/p>\n

self.<\/span>slider.<\/span>blockSignals(<\/span>True<\/span>)<\/span>
\n self.<\/span>slider.<\/span>setValue(<\/span>self.<\/span>current_index)<\/span>
\n self.<\/span>slider.<\/span>blockSignals(<\/span>False<\/span>)<\/span>
\n self.<\/span>_update_time_label(<\/span>)<\/span><\/p>\n

# —————- \u8fdb\u5ea6\u6761 —————-<\/span>
\n def<\/span> _on_slider_pressed<\/span>(<\/span>self)<\/span>:<\/span>
\n self.<\/span>_seeking =<\/span> True<\/span>
\n if<\/span> self.<\/span>is_playing:<\/span>
\n self.<\/span>stop_play(<\/span>)<\/span><\/p>\n

def<\/span> _on_slider_released<\/span>(<\/span>self)<\/span>:<\/span>
\n self.<\/span>_seeking =<\/span> False<\/span>
\n self.<\/span>_read_frame_at(<\/span>self.<\/span>slider.<\/span>value(<\/span>)<\/span>)<\/span><\/p>\n

def<\/span> _on_slider_value<\/span>(<\/span>self,<\/span> value)<\/span>:<\/span>
\n if<\/span> self.<\/span>_seeking or<\/span> self.<\/span>is_playing:<\/span>
\n return<\/span>
\n self.<\/span>_read_frame_at(<\/span>value)<\/span><\/p>\n

def<\/span> _read_frame_at<\/span>(<\/span>self,<\/span> index:<\/span> int<\/span>)<\/span>:<\/span>
\n if<\/span> self.<\/span>cap is<\/span> None<\/span>:<\/span>
\n return<\/span>
\n index =<\/span> max<\/span>(<\/span>0<\/span>,<\/span> min<\/span>(<\/span>int<\/span>(<\/span>index)<\/span>,<\/span> max<\/span>(<\/span>self.<\/span>frame_count –<\/span> 1<\/span>,<\/span> 0<\/span>)<\/span>)<\/span>)<\/span>
\n self.<\/span>cap.<\/span>set<\/span>(<\/span>cv2.<\/span>CAP_PROP_POS_FRAMES,<\/span> index)<\/span>
\n ok,<\/span> frame =<\/span> self.<\/span>cap.<\/span>read(<\/span>)<\/span>
\n if<\/span> not<\/span> ok:<\/span>
\n return<\/span>
\n self.<\/span>current_index =<\/span> index
\n self.<\/span>canvas.<\/span>set_frame(<\/span>frame)<\/span><\/p>\n

self.<\/span>slider.<\/span>blockSignals(<\/span>True<\/span>)<\/span>
\n self.<\/span>slider.<\/span>setValue(<\/span>index)<\/span>
\n self.<\/span>slider.<\/span>blockSignals(<\/span>False<\/span>)<\/span>
\n self.<\/span>_update_time_label(<\/span>)<\/span><\/p>\n

def<\/span> _update_time_label<\/span>(<\/span>self)<\/span>:<\/span>
\n cur =<\/span> self.<\/span>current_index \/<\/span> self.<\/span>fps
\n total =<\/span> max<\/span>(<\/span>self.<\/span>frame_count –<\/span> 1<\/span>,<\/span> 0<\/span>)<\/span> \/<\/span> self.<\/span>fps
\n self.<\/span>lbl_time.<\/span>setText(<\/span>"%s \/ %s"<\/span> %<\/span> (<\/span>self.<\/span>_fmt_time(<\/span>cur)<\/span>,<\/span> self.<\/span>_fmt_time(<\/span>total)<\/span>)<\/span>)<\/span><\/p>\n

@staticmethod<\/span>
\n def<\/span> _fmt_time<\/span>(<\/span>sec:<\/span> float<\/span>)<\/span> –<\/span>><\/span> str<\/span>:<\/span>
\n sec =<\/span> int<\/span>(<\/span>max<\/span>(<\/span>sec,<\/span> 0<\/span>)<\/span>)<\/span>
\n return<\/span> "%02d:%02d"<\/span> %<\/span> (<\/span>sec \/\/<\/span> 60<\/span>,<\/span> sec %<\/span> 60<\/span>)<\/span><\/p>\n

# —————- \u9009\u533a\u4fe1\u606f —————-<\/span>
\n def<\/span> _on_crop_changed<\/span>(<\/span>self,<\/span> rect:<\/span> QRectF)<\/span>:<\/span>
\n if<\/span> rect is<\/span> None<\/span> or<\/span> rect.<\/span>width(<\/span>)<\/span> <=<\/span> 0<\/span>:<\/span>
\n self.<\/span>lbl_info.<\/span>setText(<\/span>"\u672a\u9009\u62e9\u533a\u57df"<\/span>)<\/span>
\n return<\/span>
\n self.<\/span>lbl_info.<\/span>setText(<\/span>
\n "\u9009\u533a %d \u00d7 %d @ (%d, %d)"<\/span>
\n %<\/span> (<\/span>int<\/span>(<\/span>round<\/span>(<\/span>rect.<\/span>width(<\/span>)<\/span>)<\/span>)<\/span>,<\/span> int<\/span>(<\/span>round<\/span>(<\/span>rect.<\/span>height(<\/span>)<\/span>)<\/span>)<\/span>,<\/span>
\n int<\/span>(<\/span>round<\/span>(<\/span>rect.<\/span>x(<\/span>)<\/span>)<\/span>)<\/span>,<\/span> int<\/span>(<\/span>round<\/span>(<\/span>rect.<\/span>y(<\/span>)<\/span>)<\/span>)<\/span>)<\/span>)<\/span><\/p>\n

# —————- \u4fdd\u5b58 —————-<\/span>
\n def<\/span> save_video<\/span>(<\/span>self)<\/span>:<\/span>
\n if<\/span> self.<\/span>cap is<\/span> None<\/span> or<\/span> not<\/span> self.<\/span>video_path:<\/span>
\n return<\/span><\/p>\n

rect =<\/span> self.<\/span>canvas.<\/span>crop_rect(<\/span>)<\/span>
\n if<\/span> rect is<\/span> None<\/span> or<\/span> rect.<\/span>width(<\/span>)<\/span> <<\/span> 2<\/span> or<\/span> rect.<\/span>height(<\/span>)<\/span> <<\/span> 2<\/span>:<\/span>
\n QMessageBox.<\/span>warning(<\/span>self,<\/span> "\u63d0\u793a"<\/span>,<\/span> "\u8bf7\u5148\u5728\u753b\u9762\u4e0a\u6846\u9009\u4e00\u4e2a\u6709\u6548\u7684\u88c1\u526a\u533a\u57df\u3002"<\/span>)<\/span>
\n return<\/span><\/p>\n

x =<\/span> int<\/span>(<\/span>round<\/span>(<\/span>rect.<\/span>x(<\/span>)<\/span>)<\/span>)<\/span>
\n y =<\/span> int<\/span>(<\/span>round<\/span>(<\/span>rect.<\/span>y(<\/span>)<\/span>)<\/span>)<\/span>
\n w =<\/span> int<\/span>(<\/span>round<\/span>(<\/span>rect.<\/span>width(<\/span>)<\/span>)<\/span>)<\/span>
\n h =<\/span> int<\/span>(<\/span>round<\/span>(<\/span>rect.<\/span>height(<\/span>)<\/span>)<\/span>)<\/span><\/p>\n

x =<\/span> max<\/span>(<\/span>0<\/span>,<\/span> min<\/span>(<\/span>x,<\/span> self.<\/span>fw –<\/span> 1<\/span>)<\/span>)<\/span>
\n y =<\/span> max<\/span>(<\/span>0<\/span>,<\/span> min<\/span>(<\/span>y,<\/span> self.<\/span>fh –<\/span> 1<\/span>)<\/span>)<\/span>
\n w =<\/span> max<\/span>(<\/span>2<\/span>,<\/span> min<\/span>(<\/span>w,<\/span> self.<\/span>fw –<\/span> x)<\/span>)<\/span>
\n h =<\/span> max<\/span>(<\/span>2<\/span>,<\/span> min<\/span>(<\/span>h,<\/span> self.<\/span>fh –<\/span> y)<\/span>)<\/span>
\n # H.264 \u4e00\u822c\u8981\u6c42\u5bbd\u9ad8\u4e3a\u5076\u6570<\/span>
\n w -=<\/span> w %<\/span> 2<\/span>
\n h -=<\/span> h %<\/span> 2<\/span>
\n if<\/span> w <<\/span> 2<\/span> or<\/span> h <<\/span> 2<\/span>:<\/span>
\n QMessageBox.<\/span>warning(<\/span>self,<\/span> "\u63d0\u793a"<\/span>,<\/span> "\u88c1\u526a\u533a\u57df\u592a\u5c0f，\u65e0\u6cd5\u5bfc\u51fa\u3002"<\/span>)<\/span>
\n return<\/span><\/p>\n

base,<\/span> _ =<\/span> os.<\/span>path.<\/span>splitext(<\/span>self.<\/span>video_path)<\/span>
\n default_out =<\/span> base +<\/span> "_crop.mp4"<\/span>
\n out_path,<\/span> _ =<\/span> QFileDialog.<\/span>getSaveFileName(<\/span>
\n self,<\/span> "\u4fdd\u5b58\u88c1\u526a\u540e\u7684\u89c6\u9891"<\/span>,<\/span> default_out,<\/span>
\n "MP4 \u89c6\u9891 (*.mp4);;AVI \u89c6\u9891 (*.avi)"<\/span>)<\/span>
\n if<\/span> not<\/span> out_path:<\/span>
\n return<\/span><\/p>\n

self.<\/span>stop_play(<\/span>)<\/span>
\n self.<\/span>act_save.<\/span>setEnabled(<\/span>False<\/span>)<\/span><\/p>\n

self.<\/span>progress_dlg =<\/span> QProgressDialog(<\/span>"\u6b63\u5728\u5bfc\u51fa\u88c1\u526a\u540e\u7684\u89c6\u9891…"<\/span>,<\/span> "\u53d6\u6d88"<\/span>,<\/span>
\n 0<\/span>,<\/span> 100<\/span>,<\/span> self)<\/span>
\n self.<\/span>progress_dlg.<\/span>setWindowTitle(<\/span>"\u5bfc\u51fa\u4e2d"<\/span>)<\/span>
\n self.<\/span>progress_dlg.<\/span>setWindowModality(<\/span>Qt.<\/span>WindowModal)<\/span>
\n self.<\/span>progress_dlg.<\/span>setMinimumDuration(<\/span>0<\/span>)<\/span>
\n self.<\/span>progress_dlg.<\/span>setAutoClose(<\/span>False<\/span>)<\/span>
\n self.<\/span>progress_dlg.<\/span>setValue(<\/span>0<\/span>)<\/span><\/p>\n

ffmpeg =<\/span> find_ffmpeg(<\/span>)<\/span>
\n if<\/span> ffmpeg is<\/span> not<\/span> None<\/span>:<\/span>
\n duration =<\/span> (<\/span>self.<\/span>frame_count \/<\/span> self.<\/span>fps)<\/span> if<\/span> self.<\/span>fps ><\/span> 0<\/span> else<\/span> 0.0<\/span>
\n self.<\/span>worker =<\/span> FfmpegCropWorker(<\/span>
\n self.<\/span>video_path,<\/span> out_path,<\/span> (<\/span>x,<\/span> y,<\/span> w,<\/span> h)<\/span>,<\/span> duration,<\/span> ffmpeg)<\/span>
\n else<\/span>:<\/span>
\n reply =<\/span> QMessageBox.<\/span>question(<\/span>
\n self,<\/span> "\u672a\u68c0\u6d4b\u5230 ffmpeg"<\/span>,<\/span>
\n "\u672a\u68c0\u6d4b\u5230 ffmpeg，\u5c06\u4f7f\u7528 OpenCV \u5bfc\u51fa（\u4e0d\u4fdd\u7559\u97f3\u8f68）\u3002\\\\n\\\\n"<\/span>
\n "\u5982\u9700\u4fdd\u7559\u97f3\u9891，\u8bf7\u5148\u6267\u884c： pip install imageio-ffmpeg\\\\n"<\/span>
\n "（\u6216\u81ea\u884c\u5b89\u88c5 ffmpeg \u5e76\u52a0\u5165 PATH），\u7136\u540e\u91cd\u65b0\u6253\u5f00\u672c\u7a0b\u5e8f\u3002\\\\n\\\\n"<\/span>
\n "\u662f\u5426\u7ee7\u7eed\u5bfc\u51fa？"<\/span>,<\/span>
\n QMessageBox.<\/span>Yes |<\/span> QMessageBox.<\/span>No,<\/span> QMessageBox.<\/span>Yes)<\/span>
\n if<\/span> reply !=<\/span> QMessageBox.<\/span>Yes:<\/span>
\n self.<\/span>_close_progress(<\/span>)<\/span>
\n self.<\/span>act_save.<\/span>setEnabled(<\/span>True<\/span>)<\/span>
\n return<\/span>
\n self.<\/span>worker =<\/span> CropSaveWorker(<\/span>
\n self.<\/span>video_path,<\/span> out_path,<\/span> (<\/span>x,<\/span> y,<\/span> w,<\/span> h)<\/span>,<\/span> self.<\/span>fps)<\/span><\/p>\n

self.<\/span>worker.<\/span>progressChanged.<\/span>connect(<\/span>self.<\/span>progress_dlg.<\/span>setValue)<\/span>
\n self.<\/span>worker.<\/span>finishedOk.<\/span>connect(<\/span>self.<\/span>_on_save_done)<\/span>
\n self.<\/span>worker.<\/span>failed.<\/span>connect(<\/span>self.<\/span>_on_save_failed)<\/span>
\n self.<\/span>worker.<\/span>cancelled.<\/span>connect(<\/span>self.<\/span>_on_save_cancelled)<\/span>
\n self.<\/span>progress_dlg.<\/span>canceled.<\/span>connect(<\/span>self.<\/span>worker.<\/span>cancel)<\/span>
\n self.<\/span>worker.<\/span>start(<\/span>)<\/span><\/p>\n

def<\/span> _close_progress<\/span>(<\/span>self)<\/span>:<\/span>
\n if<\/span> self.<\/span>progress_dlg is<\/span> not<\/span> None<\/span>:<\/span>
\n self.<\/span>progress_dlg.<\/span>reset(<\/span>)<\/span>
\n self.<\/span>progress_dlg.<\/span>close(<\/span>)<\/span>
\n self.<\/span>progress_dlg =<\/span> None<\/span><\/p>\n

def<\/span> _on_save_done<\/span>(<\/span>self,<\/span> path:<\/span> str<\/span>)<\/span>:<\/span>
\n self.<\/span>_close_progress(<\/span>)<\/span>
\n self.<\/span>act_save.<\/span>setEnabled(<\/span>True<\/span>)<\/span>
\n QMessageBox.<\/span>information(<\/span>self,<\/span> "\u5b8c\u6210"<\/span>,<\/span>
\n "\u88c1\u526a\u89c6\u9891\u5df2\u4fdd\u5b58\u5230：\\\\n%s"<\/span> %<\/span> path)<\/span><\/p>\n

def<\/span> _on_save_failed<\/span>(<\/span>self,<\/span> msg:<\/span> str<\/span>)<\/span>:<\/span>
\n self.<\/span>_close_progress(<\/span>)<\/span>
\n self.<\/span>act_save.<\/span>setEnabled(<\/span>True<\/span>)<\/span>
\n QMessageBox.<\/span>critical(<\/span>self,<\/span> "\u5bfc\u51fa\u5931\u8d25"<\/span>,<\/span> msg)<\/span><\/p>\n

def<\/span> _on_save_cancelled<\/span>(<\/span>self)<\/span>:<\/span>
\n self.<\/span>_close_progress(<\/span>)<\/span>
\n self.<\/span>act_save.<\/span>setEnabled(<\/span>True<\/span>)<\/span>
\n self.<\/span>statusBar(<\/span>)<\/span>.<\/span>showMessage(<\/span>"\u5df2\u53d6\u6d88\u5bfc\u51fa"<\/span>,<\/span> 4000<\/span>)<\/span><\/p>\n

# —————- \u5173\u95ed —————-<\/span>
\n def<\/span> closeEvent<\/span>(<\/span>self,<\/span> event)<\/span>:<\/span>
\n self.<\/span>timer.<\/span>stop(<\/span>)<\/span>
\n if<\/span> self.<\/span>worker is<\/span> not<\/span> None<\/span> and<\/span> self.<\/span>worker.<\/span>isRunning(<\/span>)<\/span>:<\/span>
\n self.<\/span>worker.<\/span>cancel(<\/span>)<\/span>
\n self.<\/span>worker.<\/span>wait(<\/span>3000<\/span>)<\/span>
\n if<\/span> self.<\/span>cap is<\/span> not<\/span> None<\/span>:<\/span>
\n self.<\/span>cap.<\/span>release(<\/span>)<\/span>
\n self.<\/span>cap =<\/span> None<\/span>
\n super<\/span>(<\/span>)<\/span>.<\/span>closeEvent(<\/span>event)<\/span><\/p>\n

# ————————————————————————— #<\/span>
\ndef<\/span> main<\/span>(<\/span>)<\/span>:<\/span>
\n QApplication.<\/span>setAttribute(<\/span>Qt.<\/span>AA_EnableHighDpiScaling,<\/span> True<\/span>)<\/span>
\n QApplication.<\/span>setAttribute(<\/span>Qt.<\/span>AA_UseHighDpiPixmaps,<\/span> True<\/span>)<\/span><\/p>\n

app =<\/span> QApplication(<\/span>sys.<\/span>argv)<\/span>
\n app.<\/span>setStyle(<\/span>"Fusion"<\/span>)<\/span><\/p>\n

win =<\/span> MainWindow(<\/span>)<\/span>
\n win.<\/span>show(<\/span>)<\/span>
\n sys.<\/span>exit(<\/span>app.<\/span>exec_(<\/span>)<\/span>)<\/span><\/p>\n

if<\/span> __name__ ==<\/span> "__main__"<\/span>:<\/span>
\n main(<\/span>)<\/span><\/p>\n

\u7ed3\u8bed<\/h3>\n

\u672c\u6587\u8be6\u8ff0\u4e86\u4e00\u6b3e\u89c6\u9891\u88c1\u526a\u5de5\u5177\u4ece\u96cf\u5f62\u5230\u7a33\u5b9a\u7684\u5b8c\u6574\u8fc7\u7a0b\u3002\u901a\u8fc7 PyQt5 \u6784\u5efa\u4ea4\u4e92\u754c\u9762，OpenCV \u5b8c\u6210\u89c6\u9891\u89e3\u7801\u4e0e\u9884\u89c8，ffmpeg \u5b9e\u73b0\u5e26\u97f3\u8f68\u7684\u88c1\u526a\u5bfc\u51fa，\u4e09\u8005\u5404\u53f8\u5176\u804c\u3002\u5728\u5f00\u53d1\u4e2d\u9047\u5230\u7684\u5bfc\u5165\u9519\u8bef\u3001\u97f3\u9891\u4e22\u5931\u4e0e\u8fdb\u5ea6\u6761\u6b7b\u9501，\u5206\u522b\u5bf9\u5e94\u4e86\u6a21\u5757\u5212\u5206\u3001\u591a\u5a92\u4f53\u5bb9\u5668\u7406\u89e3\u548c\u8fdb\u7a0b\u95f4\u901a\u4fe1\u8fd9\u4e09\u4e2a\u5c42\u9762\u7684\u77e5\u8bc6\u3002\u7406\u89e3\u8fd9\u4e9b\u95ee\u9898\u7684\u672c\u8d28，\u4e0d\u4ec5\u6709\u52a9\u4e8e\u4fee\u590d\u5f53\u524d\u5de5\u5177，\u4e5f\u4e3a\u4eca\u540e\u5904\u7406\u66f4\u590d\u6742\u7684\u89c6\u9891\u5904\u7406\u4efb\u52a1\u5960\u5b9a\u4e86\u57fa\u7840\u3002\u8bfb\u8005\u53ef\u5728\u6b64\u57fa\u7840\u4e0a\u7ee7\u7eed\u6269\u5c55，\u4f8b\u5982\u589e\u52a0\u6279\u91cf\u5904\u7406\u3001\u81ea\u5b9a\u4e49\u7f16\u7801\u53c2\u6570\u6216\u5b9e\u65f6\u9884\u89c8\u88c1\u526a\u6548\u679c\u7b49\u529f\u80fd\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

\u5728\u89c6\u9891\u5904\u7406\u7684\u5b9e\u9645\u5de5\u4f5c\u4e2d，\u7ecf\u5e38\u9700\u8981\u5bf9\u753b\u9762\u8fdb\u884c\u5c40\u90e8\u88c1\u526a，\u4f8b\u5982\u53bb\u9664\u9ed1\u8fb9\u3001\u805a\u7126\u7279\u5b9a\u533a\u57df\u6216\u9002\u914d\u4e0d\u540c\u663e\u793a\u6bd4\u4f8b\u3002\u4e00\u4e2a\u76f4\u89c2\u6613\u7528\u7684\u88c1\u526a\u5de5\u5177\u5e94\u5f53\u5141\u8bb8\u7528\u6237\u5148\u9884\u89c8\u89c6\u9891\u5185\u5bb9，\u518d\u901a\u8fc7\u9f20\u6807\u62d6\u62fd\u9009\u62e9\u4fdd\u7559\u533a\u57df，\u5e76\u5728\u5bfc\u51fa\u65f6\u4fdd\u6301\u539f\u59cb\u6bd4\u4f8b\u4e0e\u97f3\u9891\u8f68\u9053\u3002\u672c\u6587\u5b8c\u6574\u8bb0\u5f55\u4e86\u4e00\u6b3e\u57fa\u4e8e Python\u3001PyQt5\u3001OpenCV \u4e0e ffmpeg \u7684\u89c6\u9891\u88c1\u526a\u5de5\u5177\u7684\u5f00\u53d1\u5386\u7a0b，\u4ece\u754c\u9762\u4ea4\u4e92\u5230\u540e\u53f0\u7f16\u7801，\u5e76\u6df1\u5165\u63a2\u8ba8\u4e86\u5bfc\u5165\u9519\u8bef\u3001\u97f3\u9891\u4e22\u5931\u4ee5\u53ca\u8fdb\u5ea6\u6761\u5361\u6b7b\u8fd9\u4e09\u4e2a\u5178\u578b\u95ee<\/p>\n","protected":false},"author":2,"featured_media":111624,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[1460,81,218,214],"topic":[],"class_list":["post-111625","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-server","tag-opencv","tag-python","tag-qt","tag-214"],"yoast_head":"\n\u89c6\u9891\u753b\u9762\u88c1\u526a\u5de5\u5177\u7684\u8bbe\u8ba1\u4e0e\u5b9e\u73b0\uff1aPyQt5\u3001OpenCV \u4e0e ffmpeg \u7684\u534f\u540c - 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