I'd actually thought about making some sort of library which would record the screen video and audio from the microphone. It would be quite useful for devs to plug in to their app.
Mr Jack - I wonder why you're bothering with doing delta stuff yourself? UIGetScreenImage() is pretty quick (and is an approved API now) and if you use just drop the images straight onto disk then I can't really see it being an issue. Then you can compress them afterwards. Or did you try that way and find it was better to do what you did?
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