Video conversion from MPG to MP4 loses its audio

Try to convert a .mpg file to .mp4 (so that you could watch it in your iPod video), iTunes 6.0.2.23 does the conversion but there's no sound, only the video part works. I tried to do the same conversion using QuickTime 7.0.4, again the video part of .mp4 filefine, but the audio part was mute.
Could the iTunes/QuickTime programmer who wrote this conversion routine take a look at this problem.
Regards,
Nushin

This is actually by design, not a bug. Albeit a stupid design, IMO.
Quicktime cannot cope with muxed MPEG files. You can work around this shortcoming in many different ways though. I've detailed two of these ways here: http://discussions.apple.com/thread.jspa?messageID=1171379&#1171379

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