| If you do have the freedom to make one video (some do not) you should have better luck with the Image Texturing Properties patch than Cropping. Cropping requires us to create a copy of the sub-region internally, whereas texturing properties should just play with the GL commands to slide the image around.
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Image Texturing Properties - Split.qtz
Description: application/quartzcomposer
On Jun 3, 2010, at 8:29 AM, vade wrote: Have you deduced what the actual performance bottleneck is? Playing 20 videos, or even one very high resolution, 60FPS movie can, depending on your hardware, disk subsystem, and chosen codec, bring a computer to its knees rather quickly
Have you done 'sanity tests' and made sure that these 20 movies play alright in quicktime (all playing simultaneously?) and dont drop frames. One thing to note is that the QC movie player ought to be set to asynchronous for maximum performance (it can read ahead a few frames and buffer rather than decode always just in time). Also check GL profiler and look at your video memory usage while in QC, as QC will be 'heavier' texture usage wise, and if you get into territory where you are just near, or over your physical VRam, OS X will begin to swap it out, making anything on the GPU terribly slow.
On Jun 3, 2010, at 10:39 AM, luca palmili wrote: Hi,
I need to play 20 videos in my composition, each one in a separate quad. If I use 20 sprites linked with 20 players, performance drop down.
I tried to pre-render videos in one single video in high resolution, use 'image crop' to crop multiple parts from it, and then send the cropped images to 20 sprites, but I still got low FPS.
I tried also to write a custom plugin that render a simple quad (following this example) and use UV coords to crop the high-res video using glTexCoord() for each vertex: performance growed up a bit, but I'm still under 60 FPS.
Is there another way to solve this kind of problem?
Thank you,
Luke
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