6.11.4 ffmpeg 提取音频

知道视频中的音频编码时:ffmpeg -i in.mp4 -c:v none -c:a copy out.mp3
不知道编码,需要转换时:ffmpeg -i in.mp4 -c:v none -c:a ac3 -b:a 128k -r:a44100 -ac 2 out.ac3

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