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I'm using the AVVideoCompositionCoreAnimationTool with a AVAssetExportSession to draw overlays into a video on iPhone.

particularly i'm looking to draw something really similar to Timecode into the video. I can do this witha custom CALayer (or layer delegate, either way). I have this working with one issue,

The problem is I can't see a way of calling setNeedsDisplay each frame on my custom CALayer so that I can change the type every frame through the drawInContext call.

Is there someway to ensure that drawInContext is called before rendering each frame of the video during export?

Thanks!

DShah
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James George
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  • Have you found an answer to this problem? I have the exact same issue related to question http://stackoverflow.com/q/7523541/913665 and so is John in http://stackoverflow.com/q/6022873/913665. Thanks for your help. – aLevelOfIndirection Oct 08 '11 at 09:45

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