FFmpeg.exe 可用于视频截取片段，更改分辨率帧率等，window实测可用

截取：ffmpeg.exe -i input.ts –vcodec copy –ss 00:00 –t 00:10 out.ts 转换：ffmpeg.exe -i 2160p_30fps.mp4 -s 1920x1080 -r 60 1080p_60fps.mp4