Converting RGBA to ARGB (glReadPixels -> AVAssetWriter)

Question

I want to record images, rendered with OpenGL, into a movie-file with the help of AVAssetWriter. The problem arises, that the only way to access pixels from an

Answer 1

What happens if you put an extra 128 bytes of slack on the end of your buffer? It might be that OpenGL is trying to fill 4/8/16/etc bytes at a time for performance, and has a bug when the buffer is non-aligned or something. It wouldn't be the first time a performance optimization in OpenGL had issues on an edge case :)