How to tell what type of sample is requested by MediaStreamSource.SampleRequested?

MediaStreamSource.SampleRequested handler gets MediaStreamSourceSampleRequestedEventArgs which has s StreamDescriptor.
The StreamDescriptor has property Name, but it does not seem to work. When the MediaStreamSource is created, both VideoStreamDescriptor and AudioStreamDescriptor have their Name property set, but Name is null in the SampleRequested handler.
Hong

I think check the object type (e.g. if (args.Request.StreamDescriptor is VideoStreamDescriptor)...) is a hack. This will not work if there are more than one streams of the same type (e.g. audio). I would still like to know the official
way of doing this. I am also curious about the usage of the Name property.
Hong

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How to tell what type of sample is requested by MediaStreamSource.SampleRequested?

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