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BUNDLE and the same RTP header extension ID pointing to different uris

From: Iñaki Baz Castillo <ibc@aliax.net>
Date: Tue, 31 Jan 2017 23:00:54 +0100
Message-ID: <CALiegfnV-E2Jj3kA2s7BL67EaCgT6z08nbeYFH1=RH-PabcH-A@mail.gmail.com>
To: "public-webrtc@w3.org" <public-webrtc@w3.org>
Hi, Firefox creates a SDP offer as follows (simplified):

a=group:BUNDLE sdparta_0 sdparta_1

m=audio 9 UDP/TLS/RTP/SAVPF 109 9 0 8
a=extmap:1 urn:ietf:params:rtp-hdrext:ssrc-audio-level
a=extmap:2 urn:ietf:params:rtp-hdrext:sdes:rtp-stream-id

m=video 9 UDP/TLS/RTP/SAVPF 120 121 126 97
a=extmap:1 urn:ietf:params:rtp-hdrext:sdes:rtp-stream-id

This is, it uses the same id 1 to indicate different RTP header
extensions within the *same* RTP session (as both, the audio and the
video streams, are bundled).

AFAIR this is a bug because the ID of RTP header extensions within the
same RTP session must be unique. Am I wrong?

Iñaki Baz Castillo
Received on Tuesday, 31 January 2017 22:01:55 UTC

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