I have a video (1280 x 720 Photo JPEG) that plays back fine in Quicktime but only achieves 18-20 FPS in Quartz Composer so I get a jerky motion. I would really like to play this back in QC. My Laptop is a Powerbook Pro 2.16GHz 2GB the GPU is RadeonX1600. Just interested as to why this might be.
The Movie Loader patch has terrible performance :( (We are fighting with this too on a project) -- for slightly better framerates, try opening the inspector panel, and making the patch run in "Asynchronous" mode. You'll lose the ability to jump to arbitrary times, but you'll gain the ability to play audio from the movies -- depending on what you're trying to do, this may be completely useless and unhelpful, or it might get you a few more fps.
<mode type="nerd">The movie loader patch performs poorly perhaps in part because it requires the composition's frame time each frame. Because the composition often runs at a different framerate than the movie, the movie loader has to wait till the next composition frame to see exactly when it is. Because of this, it can't simply decode "the next frame", because that's not correct with respect to time. Quicktime has an advantage here, in that it can run at whatever framerate it wants, and can just decode the movie sequentially (jumping to arbitrary points is possible, but not the common case), which is pretty cheap for most codecs. seeking to a given frame/time though is maybe a bit more expensive, and QC effectively does this every frame.
</mode> -- [ christopher wright ] [EMAIL PROTECTED] http://kineme.net/
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