6.11.1 ffmpeg 视频转换

ffmpeg -i input.mp4 -s:v 1280x720 -b:v 2000k -r:v 25 -c:v h264 -c:a ac3-b:a 128k -r:a 44100 -ac 2 output.mp4
:v视频参数,:a音频参数,-ac声道。

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