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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Video conversion from .avi to .mp4

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Visit and download Vuze - http://www.vuze.com/app
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I am looking for best practice for video conversions.
I am downloading adobe recordings via this method:
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Best practice video conversion from download
mach5kel
to:
jsb152
05/21/12 01:03 PM
Please respond to jive-509399086-9dnu-2-2mvb7
Re: Best practice video conversion from download
created by mach5kel in Connect General Discussion - View the full
discussion
Yes, I use this as a last resort, as the quality of capture this was is
signifcatnly lower. As well as it is a much more time consuming process. I
sometimes have over 50 parts of 1 hour video. To use camtasia, you need
first to record it, then it must be saved in a camtasia format, and then
lastly rendered into avi or wmv. Therefore, it is does take awhile.
Really, I feel there shouldnt be so many errors in the conversion process,
but I am finding the FLV recordings themselves have problems. This last
file I am looking at, even the recording playback on adobe connect, has
serious issues with audio and video sync. A problem that is all too common
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Can some recommend a video converter from VOB to MP4

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Video conversion from MPG to MP4 loses its audio

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