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I am using aAVVideoCoreAnimationToolto render titles on top of a video composition.I used to use+videoCompositionCoreAnimationToolWithPostProcessingAsVideoLayer:inLayer:to instantiate the animation tool.However, I now need to use a custom compositor to render the video composition. I want to usevideoCompositionCoreAnimationToolWithAdditionalLayer:asTrackID:so that I have access to an asset track with the titles in my compositor.However, I can't get titles to render when adding the core animation layer as a track.In my custom compositor I have access to the track, i.e. I can get a pixelBuffer for the trackID I have assigned for the Core Animation layer when instantiating the animation tool. But these pixel buffers are empty.- (void)startVideoCompositionRequest:(AVAsynchronousVideoCompositionRequest *)request { CMPersistentTrackID titleTrackID = ... CVPixelBufferRef titlePixelBuffer = [request sourceFrameByTrackID:titleTrackID]; //titlePixelBuffer is valid pixel buffer but never contains any pixel data }When I set up the core animation tool the same way, but don't use a custom compositor, the title layer also isn't rendered.If I set up the animation tool using+videoCompositionCoreAnimationToolWithPostProcessingAsVideoLayer:inLayer:and don't use a custom compositor the title layer is rendered as it should.Is there anything I'm missing?(I am also adding the sourceTrackID of the title track to the composition's AVVideoCompositionInstruction instances)

I'm having some strange SwiftUI issues in a widget I'm building. Applying opacity to Text results in the Text not being rendered 	Text("hello") 		.foregroundColor(Color.green) 		.opacity(0.4) The above code fails to render (in preview and on simulator) for my widget target. It renders fine in a Playground. Applying trim to a Circle results in the Circle not being rendered 	Circle() 		.trim(from: 0.1, to: 0.5) Again, the above code fails to render (in preview and on simulator) for my widget target. It renders fine in a Playground. Does anyone have any ideas what could be causing this. I'm using Xcode 12.3

My app allows users to manually configure an output resolution for the videos they create. I notice that above a certain resolution videos can't be saved to the camera roll (it fails silently). Is there any documentation about what the maximum resolution (for different aspect ratios) is that can be saved to the camera roll? From experimenting on a iPhone 11 Pro it seems to be around 8.5 megapixel frame size, but am hoping there's a way to know without trial and error.