Convert an MP3 from 48000 to 44100 Hz?

Question

I have some MP3s that are in 48000 Hz sampling frequency. I'd like to burn them to CD, so I have to reduce the sampling frequency into 441000.

How to do that using ffmpeg?

score 93 · Answer 1 · edited Jul 06 '17 at 07:06

93

ffmpeg doesn't look to be the appropriate tool; I'd normally use sox for audio-only files.

$ sox file1.mpg -r 44100 file1-enc.mpg

If you want to try using ffmpeg anyway, I think the correct command would be

$ ffmpeg -i file1.mpg -ar 44100 file1-enc.mpg

edited Jul 06 '17 at 07:06

Community

answered Mar 05 '11 at 05:11

geekosaur

Yes sox is much better for audio, thanks for the tip! – Michael Pliskin Jan 04 '12 at 11:17
9

ffmpeg supports sox resampler since 1.1 – Benja Apr 10 '14 at 15:04
2

``sox`` didn't directly work with MP3s for me. I had to install ``libsox-fmt-mp3`` – gsmafra Mar 21 '16 at 18:58
27

`ffmpeg` is a _perfectly_ appropriate tool, though it may be overkill in a way. – leftaroundabout Aug 10 '18 at 15:44
3

And if you need constant bitrate (CBR), you can add something like `-b:a 64k` (https://trac.ffmpeg.org/wiki/Encode/MP3). – Ryan Feb 18 '19 at 15:41
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Command to use sox resampler with the ffmpeg is `ffmpeg -i file1.mpg -af aresample=resampler=soxr -ar 44100 file1-enc.mpg`, see [FFmpeg Wiki](https://trac.ffmpeg.org/wiki/FFmpeg%20and%20the%20SoX%20Resampler). – Ivan Shatsky Nov 17 '19 at 12:13

1 Answers1