Re: QuickTime playback jitter

When playing a movie inside QC Tiger, because the movie patch time has to be driven by QC (through its timebase), the movie must be played frame by frame tracking the current time value, instead of being really "played aysnchronously". That's why you have no sound and why with some codecs, there's a performance hit.

You can try changing codecs, increasing your disk bandwidth, but there's no real way to work around this unless you use write your own Cocoa app that plays the movie normally and pass the frames to QC.

On Jul 13, 2007, at 7:23 AM, Johnson, Mark P. - Duluth wrote:

It seems to me that the BIG difference between playing back a video, and

Quartz Composer, is all the extra processing going on in the Graphics Card.

I would try limiting the Frame Rate of Quartz Player to whatever the frame

rate of the video is, and see if it isn't a factor of Quartz trying to act

like a hyperactive puppy and discover new things to do every fraction of a

second.

Did anyone mention if they were playing the video to a Billboard or a

Sprite?

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