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Video tutorial on making a video mixer using Gem and pix-objects. 

This video is suitable for those who have a beginning understanding of Pure Data and GEM. It does not cover the installation process:    

http://www.archive.org/details/PureDataVideoMixer


http://www.youtube.com/watch?v=H9Wy7eNpTkw

note: For best resolution download the video from archive.org