I'd seen something that suggested that AVAssetWriter could write ProRes in MXF files, likely as part of MTRegisterProfessionalVideoWorkflowFormatReaders() and/or VTRegisterProfessionalVideoWOrkflowVideoDecoders/Encoders. All of this is undocumented. Is it possible to use AssetReader/Writer to handle MXF-wrapped ProRes? (without writing MXF handlers from scratch).
