No audio channels (only video) when converting/exporting media formats

Hi,
Last year i bought a license for quicktime 7 but i still have problems when converting.
Als with the new iTunes7 the problem still relies.
When i am converting a mpeg file to the m4v in iTunes the problem is the same.
It doens't matter which media format i get, but after the conversion is done... there are no audio channels!
When u look at the movie info option in the quicktime menu, you can see an video channel, but no audio. the orginal files do get video and audio channels...
about 6 months ago i contacted apple support for this, but the problem still relies..
Does anybody know a fix or maybe Apple can investigate this important bug!! In the past i have used Videora iPod coverter that does the job correct and muchhh faster, but i want quicktime to do that!!!
Regards,
Rick Beemsterboer

Quicktime has never exported the sound from muxed mpeg-1 or -2 files: QT Mpeg Limitations
You can run a separate demuxer to get the audio stream out or just use this freeware that exports both video and audio from mpegs to other formats: Mpeg StreamClip

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No audio channels (only video) when converting/exporting media formats

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