The Layer Refresh Request (LRR) RTCP Feedback Message draft-lennox-avtext-lrr-00 Jonathan Lennox Danny Hong Justin Uberti Stefan Holmer Magnus Flodman.

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Presentation transcript:

The Layer Refresh Request (LRR) RTCP Feedback Message draft-lennox-avtext-lrr-00 Jonathan Lennox Danny Hong Justin Uberti Stefan Holmer Magnus Flodman AVTEXT, IETF 92

Layer Refresh Request AVPF message to request refresh of one or more substreams of a layered media stream. – Without requiring full refresh of entire stream, as with FIR. Applicable to both temporal and spatial scalability. Applicable to SRST/MRST/MRMT. Lennox/Hong/Uberti/Holmer/F lodman AVTExt - Layer Refresh Request2

Layer Refresh Point Point after which a receiver, which previously had been able to decode only some (possibly none) of the layers of a source, can decode a greater number of its layers. Lennox/Hong/Uberti/Holmer/F lodman AVTExt - Layer Refresh Request3

Spatial Refresh Point S0 Lennox/Hong/Uberti/Holmer/F lodman AVTExt - Layer Refresh Request4 S1 S0 S1 S0 S1 S0 S1 … … … … Frame 3 is a Spatial Refresh Point for Layer S1.

Temporal Refresh Point T0 Lennox/Hong/Uberti/Holmer/F lodman AVTExt - Layer Refresh Request5 T1 T0 T1 T0 T1 T0 T1 … … … … Frame 6 is a Spatial Refresh Point for Layer T

Temporal Nesting T0 Lennox/Hong/Uberti/Holmer/F lodman AVTExt - Layer Refresh Request6 T1 T0 T1 T0 T1 T0 T1 …… For some temporal structures every frame is a temporal refresh point

Layer Refresh message Specify layer you want refreshed, optionally lowest layer you can currently decode. Description of layers, identification of layer switch points are codec-dependent. Draft includes sketch definitions for H.264- SVC, VP8, H.265, VP9. – Still a lot of details needed. Lennox/Hong/Uberti/Holmer/F lodman AVTExt - Layer Refresh Request7

Applicability to MRST/MRMT For SRST, straightforward. For MRST/MRMT, could we just use FIR? – FIR semantics not actually specified for multistream cases: does it refresh the individual stream, or the whole source? – A “refresh the whole source” semantic is useful for MRST/MRMT. – So this draft proposes that FIR means “whole source,” and uses LRR for “individual layer,” even for MRST/MRMT. Lennox/Hong/Uberti/Holmer/F lodman AVTExt - Layer Refresh Request8

Way forward WG Adoption? Lennox/Hong/Uberti/Holmer/F lodman AVTExt - Layer Refresh Request9