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

Using buffer+1 will mean the data is not written at the start of your malloc'd memory, but rather one byte in, so it will be writing over the end of your malloc'd memory, causing the crash.

If iOS's glReadPixels will only accept GL_RGBA then you'll have to go through and re-arrange them yourself I think.

UPDATE, sorry I missed the +1 in your malloc, StilesCrisis is probably right about the cause of the crash.