up vote 7 down vote favorite
2
share [g+] share [fb]

I downloaded a few MP4-encoded videos from which I'd like to extract the audio stream into MP3 files for easy listening on my digital player.

Most likely, VLC can do this, but the instructions followed on their forums gave out a "bubbly" sound file.

Here are the files specs:

  • Audio mp4a 44100Hz
  • Video avc1
link|improve this question
60% accept rate
Are you certain of the file specs you've listed here? Often the bubbly sound indicates that you're resampling the audio. – JDB Oct 19 '10 at 20:04
feedback

4 Answers

up vote 5 down vote

Use ffmpeg:

ffmpeg -i input_file.mp4 -vn -abr 128k -acodec libmp3lame output_file.mp3

(Don't forget to adjust the audio bitrate, -abr, otherwise you might get a huge file even for a low quality source.)

link|improve this answer
feedback
up vote 5 down vote

if you prefer a GUI, grab SUPER © (Simplified Universal Player Encoder & Renderer), it will do the job (and much more).

SUPER © is a GUI to FFmpeg, MEncoder, MPlayer, x264, musepack, monkey's audio, true audio, wavpack, ffmpeg2theora and the theora/vorbis RealProducer plugIn.

Drag & drop any Audio file or even any Video/Audio file and EXTRACT the Audio part by converting it to

aac
ac3
amr_nb
amr_wb
ape   Monkey's Audio (Lossless)
flac   FLAC (Lossless)
mmf
mp2
mp3
mpc
ogg   FLAC (Lossless)   or   Vorbis High Quality
tta    True Audio (Lossless)
wv    WavPack (Lossless)
wav
wma

SUPER © is freeware.

link|improve this answer
Thanks, Super did it. I then combined the MP3 files into a single file using "Merge MP3". – OverTheRainbow Jan 15 '10 at 18:14
1  
you're more than welcome. SUPER is truly the Swiss Army knife for multimedia file conversion. – Molly7244 Jan 15 '10 at 18:18
2  
but god, what an awful site. can they hide that download link any deeper?? – quack quixote Jan 16 '10 at 8:47
2  
Yup, their web site sure needs an overhaul. Super's UI is also a bit "unusual" ;-) – OverTheRainbow Jan 18 '10 at 9:56
feedback
up vote 1 down vote

If you are on a Mac, a simpler method in the future may be to right-click on the the file in the Finder, choose "Get Info", and change the extension from .mp4 to .m4a. Then open it in iTunes and convert it to an mp3.

link|improve this answer
feedback
up vote 1 down vote

Use Yamb to extract the raw audio (mp4a is AAC) then use a suitable MP3 encoder.

link|improve this answer
feedback

Your Answer

 
or
required, but never shown
discard

Not the answer you're looking for? Browse other questions tagged or ask your own question.