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Clarify sequence header aggregation with base layer #241

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Clarify sequence header aggregation with base layer #241

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2 changes: 1 addition & 1 deletion av1-rtp-spec.md
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Expand Up @@ -261,7 +261,7 @@ If more than one OBU contained in an RTP packet has an OBU extension header, the

If a sequence header OBU is present in an RTP packet, then it SHOULD be the first OBU in the packet. OBUs that are not associated with a particular layer (and thus do not have an OBU extension header) SHOULD be in the beginning of a packet, following the sequence header OBU if present.

A sequence header OBU SHOULD be included in the base layer when scalable encoding is used. When simulcast encodings are transported on the same SSRC (an "S" mode), a sequence header OBU SHOULD be aggregated with each spatial layer. This ensures that if an intermediary removes simulcast encodings from the bitstream before forwarding, the modified bitstream will still be decodable.
A sequence header OBU SHOULD be aggregated with the base layer when scalable encoding is used. When simulcast encodings are transported on the same SSRC (an "S" mode), a sequence header OBU SHOULD be aggregated with each spatial layer. This ensures that if an intermediary removes simulcast encodings from the bitstream before forwarding, the modified bitstream will still be decodable.


### 5.1 Examples
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