I’m aware of web sites that do it, but those usually take a longer time to upload, convert, then re-download. I’m looking for some free software, or method of converting the mp4 video file into an mp3 audio.
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Here is a step by step guide to rip DVD and convert any videos to other video formats and audio formats for iPod touch/classic/video/nano, iPhone, Zune, PSP, video capable MP3 players, YouTube, Myspace, etc. Meanwhile, it can also support output almost any audio/video format including Video format (H264, MP4, WMV, AVI, MOV, RM, 3GP, flv, SWF, mpeg-1, mpeg-2, VCD, SVCD, DVD, etc.) and Audio format (AC3, AAC, MP2, MP3, MP4, RA, WMA, etc.). It is easy-to-use and the converting speed is fast!
http://www.freedvdripper.org/dvdvideoguide/dvd-video-conversion-guide-with-ultimate-dvd-video-converter.html
Also, you can find some other software:
http://www.ask.com