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Clarification on scalabiltyMode support #24

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Jan 31, 2020
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Clarification on scalabiltyMode support #24

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Clarification on scalabiltyMode support
aboba Jan 24, 2020
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aboba Jan 24, 2020
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aboba Jan 24, 2020
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12 changes: 9 additions & 3 deletions index.html
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Expand Up @@ -82,9 +82,9 @@ <h2>Terminology</h2>
(<dfn>MRST</dfn>), also defined in [[RFC7656]] Section 3.7, refers to
implementations that transmit all layers within a single transport, using
multiple RTP streams with a distinct SSRC for each layer. This specification
only supports <a>SRST</a> transport. Codecs with RTP payload specifications
supporting <a>SRST</a> transport include VP8 [[RFC7741]], VP9 [[VP9-PAYLOAD]]
and H.264/SVC [[RFC6190]].</p>
only supports <a>SRST</a> transport, not <a>MRST</a>. Codecs with RTP payload
specifications supporting <a>SRST</a> transport include VP8 [[RFC7741]], VP9
[[VP9-PAYLOAD]] and H.264/SVC [[RFC6190]].</p>
<p>This specification references objects, methods, internal slots and dictionaries defined in
[[!WEBRTC]], including the <dfn>RTCPeerConnection</dfn> object (defined in Section 4.4),
the <dfn>RTCError</dfn> object (defined in Section 11.1),
Expand Down Expand Up @@ -261,6 +261,12 @@ <h3>Scalability modes</h3>
identifiers and characteristics, are provided in the table below. Additional information
on the scalability modes, including dependency diagrams, is available in [[AV1]]
Section 6.7.5.</p>
<p>While [[AV1]] and VP9 [[VP9-PAYLOAD]] implementations can support
all the modes defined in the table, other codecs cannot. For example, VP8
[[RFC7741]] only supports temporal scalability (e.g. "L1T2", "L1T3"). H.264/SVC
[[RFC6190]], which supports both temporal and spatial scalability, only permits
transport of simulcast on distinct SSRCs, so that it does not support the
"S" modes (where multiple encodings are transported on a single SSRC).</p>
<table style="border-width:0; width:60%" border="1">
<tbody>
<tr>
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