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POiOS: Video as GL texture with alpha transparency
 

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  1. POiOS: Video as GL texture with alpha transparency
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    <p>I'm trying to figure out the best approach to display a video on a GL texture while preserving the transparency of the alpha channel. </p> <p>Information about video as GL texture is here: <a href="https://stackoverflow.com/questions/4237538/is-it-possible-using-video-as-texture-for-gl-in-ios">Is it possible using video as texture for GL in iOS?</a> and <a href="https://stackoverflow.com/questions/5621627/ios4-how-do-i-use-video-file-as-an-opengl-texture">iOS4: how do I use video file as an OpenGL texture?</a>. </p> <p>Using ffmpeg to help with alpha transparency, but not app store friendly is here: <a href="https://stackoverflow.com/questions/4796626/iphone-display-a-semi-transparent-video-on-top-of-a-uiview/4796877#4796877">iPhone: Display a semi-transparent video on top of a UIView?</a></p> <p>The video source would be filmed in front of a green screen for chroma keying. The video could be untouched to leave the green screen or processed in a video editing suite and exported to Quicktime Animation or Apple Pro Res 4444 with Alpha.</p> <p>There are multiple approaches that I think could potentially work, but I haven't found a full solution.</p> <ol> <li>Realtime threshold processing of the video looking for green to remove</li> <li>Figure out how to use the above mentioned Quicktime codecs to preserve the alpha channel</li> <li>Blending two videos together: 1) Main video with RGB 2) separate video with alpha mask</li> </ol> <p>I would love to get your thoughts on the best approach for iOS and OpenGL ES 2.0</p> <p>Thanks.</p>
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    1. COFor me it is totally unclear what you want to do. How do you get the video to the app?
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    2. COMost likely stored locally in the main bundle
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    3. COYou could always do the color keying in the shader, it's a pretty simple operation.
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