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Possible Duplicate:
Convert mp4 to mp3

Hello everybody,

Could you please suggest me a quick way to convert just the audio of movies from AC3 to MP3 ? I would like to get a new Avi with the same video, but different audio (mp3). OS: windows 7.

(I do not need to convert video, just audio)

thank you !

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marked as duplicate by Ƭᴇcʜιᴇ007, studiohack Mar 20 '11 at 20:31

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

possible duplicate of Convert mp4 to mp3 and/or Convert windows media video stream to mp3 audio? – Ƭᴇcʜιᴇ007 Mar 20 '11 at 16:31

You can do it with ffmpeg. Try a command line like this:

ffmpeg -i <input_filename> -f <container> -vcodec copy -acodec libmp3lame -ar 44100 -ab 128k -ac 2 <output_filename>

Replace the <> stuff with whatever filenames and containers you are using. Do note that this will downmix surround to 2 channel audio.

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Could downmixing be avoided by removing -ac 2? – grawity Mar 20 '11 at 17:03
@grawity mp3 doesn't support more than 2 channels – Mr Alpha Mar 22 '11 at 8:45
any graphical software please :) ?? – iAsk Mar 22 '11 at 21:39

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