No Audio When Playing an MPEG 2 File

Hello,
I have Quicktime Pro and the MPEG plugin. I have played several different MPEG files in different players and audio is present. When I play one of these files in Quicktime, all I get is video. There is obviously audio embedded as one of the streams in the MPEG file.
Why doesn't Quicktime play the audio portion of the file?
Thanks,
Gary Young

Some mpeg-2 files use AC3 encoding for the audio stream and the Apple mpeg2 component does not play that form of audio.
http://www.apple.com/quicktime/mpeg2/faq.html
If you just want to play those problem files (not trancode to other formats) you could try this alternate player, as it plays the sound in most mpeg-2 files:
VLC

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