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Using Quartz Composer to Switch Automatically between Two Video Sources

Subject: Using Quartz Composer to Switch Automatically between Two Video Sources
From: Jeffrey Weekley <email@hidden>
Date: Tue, 1 Jul 2008 13:14:44 -0700
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Delivered-to: email@hidden

Help!

We'd like to record a screen capture of some 2D/3D graphics, but switch to a presenter when nothing is happening on the screen.

We're trying to build a QC that will take two video sources off of a server (the easy part) and composite them into one QT movie (another easy part). The hard part is switching between sources based on which source is moving. We'll also be taking ONLY the audio from the speaker camera. So, it really comes down to a way to choose which video stream to select based on which has more changing pixels.

I saw this at WWDC 2007's Podcast Producer session for educators, but can't find any example code.

Any ideas?

Thanks!

-Jeff W.
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