====== Ubuntu - Sound - Convert MP4 to MP3 ======

<code bash>
ffmpeg -i x.mp4 -vn -acodec copy x.mp3
</code>

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<code bash>
ffmpeg -i "x.mp4" -b:a 320k -vn x.mp3

ffmpeg -i "x.mp4" -b:a 192k -vn x.mp3
</code>

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<code bash>
ffmpeg -i in.mp4 -q:a 0 -map a out.mp3
</code>

<WRAP info>
**NOTE:**  The **q** option can only be used with libmp3lame and corresponds to the LAME -V option.

See [[https://trac.ffmpeg.org/wiki/Encode/MP3|Encoding VBR (Variable Bit Rate) mp3 audio]].

</WRAP>

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===== Converts every MP4 in the current directory to an MP3. =====

Preserves the original name of the file.

<code bash>
for f in *.mp4; do ffmpeg -i "$f" -vn -c:a libmp3lame -ar 44100 -ac 2 -ab 192k "${f/%mp4/mp3}"; done
</code>

<WRAP info>
**NOTE:** To use it for an flv or avi or whatever, simply change both instances of mp4.
</WRAP>



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===== References =====

https://trac.ffmpeg.org/wiki/Encode/MP3