This is a weird XCode 13 beta bug (including beta 5). Metal Core Image kernels fail to load from the library giving error 2021-08-26 12:05:23.806226+0400 MetalFilter[23183:1751438] [api] +[CIKernel kernelWithFunctionName:fromMetalLibraryData:options:error:] Cannot initialize kernel with given library data. [ERROR] Failed to create CIColorKernel: Error Domain=CIKernel Code=6 "(null)" UserInfo={CINonLocalizedDescriptionKey=Cannot initialize kernel with given library data.} But there is no such error with XCode 12.5. The kernel loads fine. Only on XCode 13 beta there is an error.

AVAudioSession API for setting stereo orientation on supported devices (iPhone XS and above) is completely broken on iOS 15 betas. Even the 'Stereo Audio Capture' sample code does not work anymore on iOS 15. Even AVCaptureAudioDataOutput fails when setting stereo orientation on AVAudioSession. I am wondering if Apple Engineers are aware of this issue and whether this would be fixed in upcoming betas and most importantly, iOS 15 mainline.

Is it necessary for AVVideoCompositionInstruction (custom) to have atleast one video asset track? If one needs to just generate video out of motion graphics and pictures, does one still need to add dummy video track added to composition first?