Convert mp4 to mp3

Camtaf · 2022-09-19 15:03:58

Convert mp4 to mp3

I have a load of mp4 files with spaces in their names, the first line replaces the spaces with _ so that the second line can convert them to mp3.

#!/bin/sh

for f in *; do mv "$f" `echo $f | tr ' ' '_'`; done

for X in *.mp4;do ffmpeg -i $X $X.mp3;done

Head_on_a_Stick · 2022-09-19 15:26:46

The second line can work with spaces in the filenames as long as you double-quote the variables, like this:

for X in *.mp4;do ffmpeg -i "$X" "$X".mp3;done

Unless you actually want to remove the spaces anyway.

To remove the spaces with bash use

for f in *\ *.mp3; do mv "$f" "${f// /_}" ; done

The "${f// /_}" bit uses bash's parameter expansion mechanism to search and replace the given pattern.

See https://wiki.bash-hackers.org/syntax/pe … nd_replace for more on this. It won't work with /bin/sh though.

EDIT: oh, hello Keith. Didn't realise it was you :-)

Last edited by Head_on_a_Stick (2022-09-19 15:40:31)

Camtaf · 2022-09-20 15:06:21

Yep, it's me again....

Thanks for the extra info though, this kind of thread gets read by more than those who post them, so any extra is always welcome.

Head_on_a_Stick · 2022-09-22 13:45:12

I really should have spotted this but victorvas over at daemonforums noticed that the output files need the ".mp4" bit stripping before adding the ".mp3" suffix, so:

for X in *.mp4; do ffmpeg -i "$X" "${X%.mp4}".mp3; done

EDIT: moved second close quote to before the dot. Meh.

Last edited by Head_on_a_Stick (2022-09-22 13:48:24)

Camtaf · 2022-09-22 14:47:36

Yes, I had to remove the .mp4 too, again, I used sed.

##To remove .mp4 from *.mp4.mp3 files
for file in *; do mv "$file" $(echo "$file" | sed -e 's/.mp4././g'); done

xinomilo · 2022-09-22 16:57:20

how about this:

find . -type f -name '*.mp4' -exec bash -c 'ffmpeg -i "$0" "${0/%mp4/mp3}"' '{}' \;

i've had this for ages (copied from some gist someplace), still works fine afaik.

zapper · 2022-11-08 05:47:04

xinomilo wrote:

how about this:
find . -type f -name '*.mp4' -exec bash -c 'ffmpeg -i "$0" "${0/%mp4/mp3}"' '{}' \;
i've had this for ages (copied from some gist someplace), still works fine afaik.

I usually do this, which looks like it was suggested above...

for i in *.mp3; do ffmpeg -i "$i" "${i%.*}.opus"; done

Btw, this works for changing to others, such as flac, or ogg, etc...

I don't think there are many ways to keep the video format though if this is what you after...

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#1 2022-09-19 15:03:58

Convert mp4 to mp3

#2 2022-09-19 15:26:46

Re: Convert mp4 to mp3

#3 2022-09-20 15:06:21

Re: Convert mp4 to mp3

#4 2022-09-22 13:45:12

Re: Convert mp4 to mp3

#5 2022-09-22 14:47:36

Re: Convert mp4 to mp3

#6 2022-09-22 16:57:20

Re: Convert mp4 to mp3

#7 2022-11-08 05:47:04

Re: Convert mp4 to mp3

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