在转换成mp3时候提示缺少 lib..., 下面是升级ffmpeg方案:

Ubuntu does not officially bundle ffmpeg after ditching it in favor of the Libav fork. There is a PPA that is quite outdated, so it should not be used unless you're keen on running an old version of ffmpeg.
I honestly have to confess that I don't know why it won't work for your specific case—or how you got an ffmpeg running in the first place, since Ubuntu does not bundle it officially.

直接下载一个构件好的ffmpeg: Use a static build

A quick solution would be to simply download a recent static build (scroll down where it says Linux Static Builds). These all have libmp3lame bundled. Extract that build to some location, and copy ffmpeg to a directory in your PATH, e.g.:

cd ~/Downloads
tar xvf ffmpeg-*.tar.xz
cd !$
sudo mkdir -p /usr/local/bin
sudo cp ./ffmpeg ./ffprobe /usr/local/bin/
sudo chmod ugo+x /usr/local/bin/ffmpeg /usr/local/bin/ffprobe

Also make sure that /usr/local/bin is in your shell PATH.

ffmpeg -i psychologist_2020_02_04_SF3K25D8D_shd.mp4 -b:a 96k -vn psychologist-96.mp3

ffmpeg -i psychologist_2020_02_04_SF3K25D8D_shd.mp4 -map 0:a -c copy psychologist.m4a

m4a 比mp3质量高,体积小,MP3兼容很多设备,都有压缩牺牲了音频质量。

Example to extract audio stream #4:

ffmpeg -i input.mkv -map 0:a:3 -c copy output.m4a

  • -map 0:a:3 selects audio stream #4 only (ffmpeg starts counting from 0).
  • -c copy enables stream copy mode. This copies the audio and does not re-encode it. Remove -c copy if you want the audio to be re-encoded.
  • Choose an output format that supports your audio format. See comparison of container formats.
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