you can use frame differencing perhaps, and a histogram on the difference?

Attachment: FrameDifference.qtz
Description: application/quartzcomposer




On Jul 7, 2008, at 3:13 PM, Jeffrey Weekley wrote:

Thanks to Chris W. for his reply using a QC Histogram approach, but since neither screen capture nor speaker video source changes all that much, we weren't able to generate a delta that was wide enough to elicit a switch from one source to another.

I _know_ I saw such a composition at the WWCD last year ('07), but I can't find that example online or in the developer directory with XCode.

Does anyone have this, because I think it's just what we're looking for.

In a nutshell, here's the problem again:

One Video Screen Capture + One Camera Video (plus audio). We want to be able to post both videos to a directory, bring them into QC and switch between the video sources, based on whether or not something is happening on the screen capture. Most of the time, it's subtle, like a mouse move. The audio from the camera plays through out. We then want a Quicktime movie from the QC.

Any ideas?

Thanks in advance.

-Jeff W.
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