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Update S mode support description
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aboba authored May 8, 2024
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9 changes: 5 additions & 4 deletions index.html
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Expand Up @@ -393,10 +393,11 @@ <h3>Scalability modes</h3>
<p>
While the [[?AV1]] and VP9 [[?VP9]] specifications support all the
{{RTCRtpEncodingParameters/scalabilityMode}} values defined in the table, other codec
specifications do not. For example, VP8 [[?RFC6386]] 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 "S" modes, where multiple encodings are transported on a single RTP stream.
specifications do not. For example, VP8 [[?RFC6386]], H.264 [[?RFC6184]] and
H.265 [[?RFC7798]] only support temporal scalability (e.g. [="L1T2"=], [="L1T3"=]).
Also VP8 [[?RFC6386]], H.264 [[?RFC6184]] and H.265 [[?RFC7798]] only permit transport
of simulcast on distinct SSRCs, so that "S" modes (where multiple encodings are
transported on a single RTP stream) are not supported.
</p>
<table class=simple>
<tbody>
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