qt 启动 ffmpeg 进程，并且读取ffmpeg的转换进度。 从ffmpeg的输出中提取进度，要点是在编码前捕获 Duration 值，并在编码期间捕获 time=... 值。
需要将 项目中的 ffpmeg.exe 以及 dancing.mp4 拷贝到应用程序目录下去
QProcess 实时读取ffmpeg进度 https://zhuanlan.zhihu.com/p/86206831
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Read ffmpeg output by qt
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