How to "demux" a video i.e. get sound from a video?

I got the following tips from the apple site but does anyone knows where I can get a 3rd party program to deal with this problem (videos which are "muxed"?
"When you export a video (like VCD) for iPod play, you may come across a situation in which the converted video doesn't contain any audio when you play the file in QuickTime Player, iTunes, or on your iPod. If this is the case, the original video file may be in a format that contains muxed (multilplexed) audio and video, and cannot be exported with audio.
To determine if your movie file is muxed, follow these steps:
Open the original movie file in QuickTime Player.
From the Window menu, choose Show Movie Info.
Click the More Info disclosure triangle in the Movie Info window (if it's closed).
Note the entry next to Format.
If the format is "MPEG1 Muxed" or "MPEG2 Muxed," the audio portion of the file may not be retained with QuickTime Pro or iMovie. You may want to consider using a third-party utility to convert the muxed file to a format that does allow you to edit or export (known as demuxing).

Hi, iPodian!
MPEG Streamclip is a good tool.
You can also check out the following two links:
http://shep.thefridgeowl.com/tutorial/files/0SEx.html
http://www.macupdate.com/info.php/id/9830
Hope this helps you out with demuxing/converting the audio.
Also, here's a tool for changing AC3 audio to AAC, which you may find useful, since the iPod can't handle AC3 audio files and you may run into this on some of the rips you do:
http://denisx.dyndns.org/bd4go/
Gary

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