It uses ffmpeg for audio/video files, unoconv for document files and PythonMagick library for image file conversions. It 'converts every MP4 in the current directory to an MP3', preserves the original name of the file, and 'to use it for an flv or avi or whatever, simply change both instances of mp4': for f in *.mp4 do ffmpeg -i "$f" -vn -c:a libmp3lame -ar 44100 -ac 2 -ab 192k "$" doneįF Multi Converter is a simple graphical application which enables you to convert audio, video, image and document files between all popular formats, using and combining other programs. In addition, following a suggestion by evilsoup, you could also use the following one-liner. Save it in a text editor and make it executable with chmod +x yourscriptname. In addition, the following script, which I have modified, ( credit to the original creator), preserves the original name of the file in the newly converted file, which may be useful for you.
(After uninstalling any ffmpeg files, I compiled ffmpeg from source using this guide) I found that the most reliable way to allow ffmpeg to use proprietary formats was to build it from source, although you can see if it works with jfreak53's method if you do not wish to build from source. I have extracted the audio from mp4 and m4a files and converted them to mp3 format many times it is very useful when a lot of podcasts come in m4a or mp4 format.
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