No sound when changing formats.

Hi there,
appologies if I'm being a total retard about this, but when I export from quicktime pro to change the format of file, the new file never has any sound.
Is there some really obvious setting I have overlooked? If not I can provided more info about my system versions and settings etc.
Thanks in advance.
Dan

appologies if I'm being a total retard about this, but when I export from quicktime pro to change the format of file, the new file never has any sound.
This usally happens when the source file contains a "muxed" stream of audio and video data (e.g., MPEG1, MPEG2, VOB, some AVI formats, some MJEPEGs, etc). The problem stems from your attemt to mix two different technologies. QT Player/Pro is a "frame-to-frame" synchronization application. "Muxed" files, on the other hand, contain a single stream of data in which blocks of video data are interspersed with blocks of audio data in order to mainatain synchronization. The normal solution in this case is to use a hybrid application like MPEG Streamclip (free), iSquint (free), etc. MPEG streamclip is a more general solution in that it can convert "muxed" files to any QT compatible format (or any format for which you have a QT compatible codec component) but requires you have the MPEG-2 component ($$) or use the KL QT alternative tools package (free) which includes its own MPEG-2 component. Other application like iSquint were designed for conversion to iPod, PSP, or similar target formats and, therefore, may be more limited in scope than you desire.
((ADDED: a bit slow when it comes to typing. Kirk beat me to the answer.))

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