This is a demo of a custom QC source patch that generates glitch on the graphics card. This patch lets you choose from various texture formats, which results in different output and glitch 'styles' from reading video card memory. You can of course specify the width and height of your output image - which you can then use as any normal mixing source, like a QT movie for example.

You can also generate a circular buffer of FBOs which the patch will play through, allowing for a kind of glitch animation. This patch will be released as part of a new Glitch plugin for Quartz Composer.