Play video with alpha channel in iOS?

Is it possible to play a video with alpha channel in you iPhone app?

I'm thinking UIView with a subview (the movie view) and play a movie with alpha channel in that v开发者_如何学Pythoniew..

Is this possible?

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Take a peek at the "APNG" app on the app store. This app is a free demo that shows how animations with an alpha channel can be implemented in an iOS app using the .apng file format. One can also take a peek at h.264 with an alpha channel for a detailed description about how a pair of h.264 videos can be used to implement a video with an alpha channel.

APNG app

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It looks like there's no way to do this with iOS provided solutions. But according to this answer to a similar question you might succeed with ffmpeg. The problem with ffmpeg is that GPL/LGPL are incompatible with Apple's terms so you can't use it in an app for the App Store.