I see this problem is reproducible only when playerItem.seekingWaitsForVideoCompositionRendering = true is set. Otherwise I have not been able to reproduce it so far.

It will take time to prepare a minimally reproducible sample code, I shall definitely do that. But in any case I need a workaround or alternative way to detect seek has finished.

I think in this case, CIContext may also need to be initialised with metalDevice, correct?

@YuAo, I saw your kernel code. I don't understand why 0.5 offset has been added in both x and y coordinates when you compute `vec2 redCoord = samplerTransform(toneCurveTexture,vec2(textureColor.r * 255.0 + 0.5 + toneCurveTextureExtent.x, toneCurveTextureExtent.y + 0.5)); ?

Why do we need to add 0.5 offset I wonder?

Sure I would file a bug!

Ok I see that. But when I record video using AVCaptureVideoDataOutput, I do see some elements in AVVideoCompressionPropertiesKey dictionary through recommendedSettings. I am not sure what would be the result to omitting AVVideoCompressionPropertiesKey, but is there a way to copy this dictionary from input video file for instance (I can't find a way to do this though)?

I want to use my custom export session class that uses AVAssetReader/Writer as I am using it in my workflow. How to correctly adapt it to ProRes videos?

Thanks for the answer. I will definitely post it on Swift forums.

This way certainly works but it is a legacy way of observing properties. I was thinking if there is modern Swift KVO based method for the same. Sorry to omit those details in my question here , I should have mentioned the details like i mentioned on stackoverflow.(https://stackoverflow.com/questions/69505085/swift-kvo-addobserver-observevalue-for-class-objects)

I am wondering why this limitation, what kind of technical reasons stop it?

I don't see these icons, how do I see them?

Value needs to adhere to protocol Interpolable and Codable. And Interpolable protocol includes just one function that returns interpolated value from value A to value B by a float amount. So all math types Int, Float, Double, and types such as CGRect, CGAffineTransform, UIColor that can be interpolated, Value can be that type.

But then I have to update EffectModel with EffectModel where ever object of type EffectModel was used. I just want to avoid touching EffectModel.

Ok I used trigonometry to calculate the new extent. Formulas work! Thank you so much for clarifying.