AVAssetReaderTrackOutputMBS.assetReaderTrackOutputWithTrack(track as AVAssetTrackMBS, outputSettings as dictionary) as AVAssetReaderTrackOutputMBS

Type	Topic	Plugin	Version	macOS	Windows	Linux	iOS	Targets
shared method	AVFoundation	MBS AVFoundation Plugin	13.2	✅ Yes	❌ No	❌ No	✅ Yes	All

Returns an asset reader wrapping a specified track, with optional output settings.

track: The track from which the reader should source sample buffers.
outputSettings: A dictionary of output settings to be used for sample output. Pass nil to receive samples as stored in the track.
You use keys from one of AVAudioSettings.h, AVVideoSettings.h, or <CoreVideo/CVPixelBuffer.h>, depending on the media type and the output format you want.
Initialization fails if the output settings cannot be used with the specified track.
Those keys are available in AVFoundationMBS class.