Gangmax Blog

在Ubuntu上从mp4文件中提取音频并转换为mp3格式

废话不多说，命令如下：

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mplayer -ao pcm ./a.mp4 -ao pcm:file="outfile.wav"
lame -h -b 192 outfile.wav a.mp3

原文来自这里。虽然我没有尝试，但是该命令貌似应该支持其它视频格式(比如avi)。命令行真是强大啊！

Added on “2021-09-17”.

From here. The method above uses “mplayer” while the current method uses “ffmpeg” which is more common.

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# 1. For FFmpeg with Constant Bitrate Encoding (CBR):
ffmpeg -i video.mp4 -vn \
       -acodec libmp3lame -ac 2 -ab 160k -ar 48000 \
        audio.mp3

# 2. Use Variable Bitrate Encoding (VBR):
ffmpeg -i video.mp4 -vn \
       -acodec libmp3lame -ac 2 -qscale:a 4 -ar 48000 \
        audio.mp3

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