This is an interesting and detailed proposal, thank you. We wonder about using multiple tracks and (for example) extractors, but the response is that a given SVC track cannot easily stop you from switching to the base layer. The proposal straddles media-specific and file-format general, in that what constitutes the sub-track needs media-specific definition. Should this be covered in e.g. the tier definitions? We wonder how often this arises in practice, and the use cases. Some asked whether SVC layer switching should be also used for program content selection switching; aren’t program selection and layer selection more properly orthogonal? Some felt that this was OK if it brought coding efficiency.
On this and the preceding contribution, some delegates asked for time to study both the use cases and the proposal, and the proponent graciously agreed to re-present these in the next meeting.
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