H.264 playback stutter in QuickTime Player 7.5.5

I've read one or two posts about stuttering H.264 playback, with hints about the latest QT version being the problem - is that the case?
I've been encoding to H.264 for over a year, and love it, but have recently noticed this problem. I most often use 720p25 format (1280x720 progressive, 25fps), at 6Mbps, encoding from a progressive source (Photo-JPEG or HDV 720p) in Compressor. My latest programme has a fairly fast-moving tracking shot, which is on the limit of what is acceptable in progressive video. Even so, watching the H.264 encode in QT Player (vsn 7.5.5) it stutters really badly. On investigation I note that when nudging through the video, frame by frame, the picture only advances every other frame, going forwards. Somewhat bizarrely it advances every frame going backwards! When I play the same file in the VLC player it plays smoothly, as does an MPEG-2 encode from the same source file (Apple Intermediate Codec 720p25).
Does anyone have any clues as to what the problem might be?
Kevan
Message was edited by: Kevan Pegley
Message was edited by: Kevan Pegley

Kevan Pegley wrote:
I'm puzzled by your note about reinstalling the revised version of Perian 1.1.1. You literally just put the file 'Perian-morelogging.component.zip' into /Library/QuickTime/ as is? Why would you not unzip it first?
{quote:title=Will : Hi ! wrote:}{quote}
When I install the newer Perian 1.1.1 provided there (manually, by placing the unzipped Perian.component in /Library/QuickTime/), the stuttering problems seems to go away.
Anyway, here's what I did in detail:
Re-install Perian 1.1.1 (stuttering came back).
Then, unzip the new Perian component, which gives me a new Perian.component file.
Finally, replace (overwrite) the existing Perian.component with the new one (in the Macintosh HD > Library > QuickTime folder).
I've done what you suggest, but I've no idea if it's doing anything at all, since QT Player plays an H.264 file without it anyway.
Kevan
My instructions above are only useful if you absolutely need Perian. Personally, I decided to stop using it. Since I do a lot of transcoding, I prefer to leave QuickTime as clean as possible, and usually use VLC for playback instead.

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