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

You will need to shift bytes by doing a memcpy or other copy operation. Modifying the pointers will leave them unaligned, which may or may not be within the capabilities of any underlying hardware (DMA bus widths, tile granularity, etc.)