iPad retina screen recording

Question

Two parts:

1. Correct me if I'm wrong, but there isn't a standard video file format that holds 2048 x 1536 frames? (i.e. recording the full resolution of the iPad retina is impossible?)

2. My app uses a glReadPixels call to record the screen, and appends the pixel buffers to an AVAssetWriterInputPixelBufferAdaptor. If the video needs to be resized to export, what's the best way to do this? I'm trying right now with AVMutableVideoCompositionLayerInstructions and CGAffineTransforms, but it's not working. Any ideas?

Thanks

Sam

Answer 1

1. Yes , it is possible. My app is also taking big frame video .

2. Don't use glReadpixels it causes a lot of delay especially if you record big frames as 2048 x 1536

Since iOS 5.0 you can use a faster way using texture cash (link)