convert a folder of mp4's to mp3's with ffmpeg?

Question

I have a folder mostly containing mp4 videos. I want to extract the audio of those videos.

for i in $(ls); do echo ffmpeg -i $i $i_mp3; done

This command doesn't take any concern for the none mp4 files, and it seems to be adding line breaks in the ls command.

basic audio extraction with ffmep is ffmpeg -i video.mp4 -f mp3 -ab 192000 -vn music.mp3 where vn is no video and acodec copy says use the same audio stream that's already in there; from Github — damadam, Dec 20 '19 at 08:59
I suggest you also to add a sed command, in order to remove the .mp4 extension on the filename, or your music filename would be for example music.mp4.mp3 — damadam, Dec 20 '19 at 09:01

score 7 · Accepted Answer · edited Dec 20 '19 at 10:02

7

The ls command is superfluous: filename expansion should be just enough. I did not understand the adding line breaks part of your question though... I suppose you had problems with blank spaces in filenames.

I would personally use a variant of the following command:

for f in *.mp4; do ffmpeg -i "$f" -vn "$(basename "$f" .mp4).mp3"; done

The basename part is just to remove the .mp4 suffix from $f. You can use some bash trickery instead, but I never remember the syntax.

edited Dec 20 '19 at 10:02

terdon

100,812

answered Dec 20 '19 at 09:20

ntd

168

Not only is it superfluous, it is also a very bad idea to parse the output of ls, and doubly so for media files which often have strange names. – terdon Dec 20 '19 at 10:00
4

The bash trickery is: "${f%.mp4}.mp3" :) – andrew.46 Dec 21 '19 at 00:57

convert a folder of mp4's to mp3's with ffmpeg?

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