Quicktime Player X can't open certain .mp4/.m4v

I have a few h.264 -mp4/m4v files that QTX can't open, but Quickview and QT7 handles with ease. The files have been made using Handbrake.
Examining the info windows in QT7 on one movie that does work and one that does not, does not tell me much. they seem pretty identical.
Info copied from opened files in QT7
Not working
JVT/AVC Coding, 720 × 384, Millioner
AAC, Stereo (L R), 48,000 kHz
Working:
JVT/AVC Coding, 704 × 400, Millioner
AAC, Stereo (L R), 48,000 kHz
Suggestions? I cant reinstall QT on 10.7.3, can I?

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
... And if none of those work, there is a possibility that, that video file may be corrupted.

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