I've opened a bug report: FB21322340 With a sample code and screenshots

I find How to replicate this problem: using a VideoCustomCompositor in AVPlayer let asset = AVURLAsset(url: Bundle.main.url(forResource: "Hand", withExtension: "mov")!) let composition = try await AVMutableVideoComposition.videoComposition(withPropertiesOf: asset) composition.customVideoCompositorClass = VideoCustomCompositor.self let playerItem = AVPlayerItem(asset: asset) playerItem.videoComposition = composition let player = AVPlayer(playerItem: [playerItem)]

The KTX format cubemap produced by this command is too large in size (128MB). Is there any way to reduce the size? Is there any documentation available for this command? Are there other methods to convert textures to KTX format? Does Reality Composer Pro only support KTX format for cubemaps?