[PLEASE HELP!] .m4v and .mpeg4 Audio Export problems (QT 7 pro)

When i try to export any clips to .m4v (movie to ipod) or .mpeg4 the video is exported but has no sound. When i select "export to .mpeg4" and click on "options" it says "audio: no audio track in source movie". This is the same message displayed on all the clips i have tried to export.
Does anyone know how i can record the audio for .m4v files or .mpeg4 files?
Thankyou so much in advance for your help.
.BenX
  Windows XP  

I'm using Quicktime Pro v 7.0.4 on Mac. I tried exporting Quictime mpeg4 to iPod format and get only video but no audio! And I'm talking Apple all the way. These files were made from a Sony digital camera with the digital video record option.
Believe most (if not all) Sony digital cameras still use MPEG video format. As such, the files contain a "muxed" stream consisting of blocks of video data interspersed with blocks of audio data for A/V synchronization. As Kirk alluded to above, QT is a "frame-to-frame" sync application and does not fully support "muxed" (e.g., MPEG1, MPEG2, VOB, some AVI, MJPEG, etc.) formats.
I do use a 3rd party program called Snapz Pro X to capture to .mpeg4 and these files export just fine to iPod format!
Good solution for capturing streamed video but not the best here. As you suggested, use a third party, MPEG based application like iSquint (free) or, better yet, MPEG Streamclip (free) for one-step conversion with audio.
I tried to convert the mpeg4 format to MOV format and then convert MOV to m4v but no audio there.
No surprise here. If you check your first MPEG4 file you will see that no audio track was present following the initial conversion and no amount of further conversions will add a non-existent audio track.

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