Black screen while sound plays - but works in VLC

I got some .h.264 QuickTime .mov files, they open up and usually show the first frame, then it is black, but the sound continues.
I've tried converting them to mp4 or other files from QuickTime player and that doesn't help.
I'm on QuickTime X, Snow Leopard here.

I got some .h.264 QuickTime .mov files, they open up and usually show the first frame, then it is black, but the sound continues... I've tried converting them to mp4 or other files from QuickTime player and that doesn't help.
Generally speaking, if the QT player cannot play the content, then QT apps or third party apps that rely on the embedded QT structure/components are usually unlikely to be able to convert them properly unless the issue is simply one of trying to play too much data on an old and underpowered system. Since you say they play correctly in VLC, try using VLC to convert or re-pack the data or try HandBrake for the conversion.
As to the original source of the problem, there is insufficient information to make any guesses at this time. For instance, QT applications do not normally like proprietary or "enhanced" versions of MPEG-4/AVC content which hybridize features/capabilities of higher profiles/levels in lower profile/level combinations.

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