No audio on mov files

I've batch captured some video using Adobe Premiere CS5. In trying to play these clips with Quicktime, most of the clips have no audio.
Using the inpsector, I noticed a difference in audio formats.
Clips where the audio doesn't play, show: Linear PCM, 16 bit little-endian signed integer, 32000 Hz, 4.0 (_ _ _ _)
Clips where the audio does play, show: Linear PCM, 16 bit little-endian signed integer, 32000 Hz, 4.0 (L R _ _)
All of the clips play correctly (with audio) in Premiere. I even uploaded one of the problem clips to Vimeo and it plays the audio fine as well. So it appears the audio is there. but for some reason Quicktime does not recognize it.
I copied one of the problem files to another Mac and the lack of audio problem persisted. Both Macs are running Lion.
Any advice is appreciated.

Quicktime X is a great little piece of software. However, Quicktime X is very finicky on which codec/file format it can decode/play.
Luckily, there are DOZENS of alternative video/media players and extensions available for the Mac. Some of them are even FREE. Some of the better FREE ones include...
PERIAN (quicktime extension)
http://www.macupdate.com/app/mac/22923/perian
QUICKTIME 7.6.6
http://support.apple.com/kb/DL923
VLC Media Player
http://www.macupdate.com/app/mac/5758/vlc-media-player
NICEPLAYER
http://www.macupdate.com/app/mac/15136/niceplayer

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