(yet another thread) About GL rendering and recording: pixelated images

Alright. I know there have been a lot of threads and writing about this subject - and I've been digging through it all day, but I haven't found a satisfactory explanation yet.
I've attached a patch - using the asyncread method of of recording to quicktime. It *does* record to quicktime and it does record at the correct size, but the pixelation is unacceptable. I know I could use another program to do screen-grabbing, but isn't there a better way to get a high resolution recording from jit.render?