Bug 173262 - Activate simulcast through addTransceiver
Summary: Activate simulcast through addTransceiver
Alias: None
Product: WebKit
Classification: Unclassified
Component: WebRTC (show other bugs)
Version: WebKit Nightly Build
Hardware: Unspecified Unspecified
: P2 Normal
Assignee: youenn fablet
Keywords: InRadar
Depends on:
Blocks: 220912
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Reported: 2017-06-12 06:24 PDT by Gustavo Garcia
Modified: 2021-01-25 09:12 PST (History)
16 users (show)

See Also:

Patch (17.04 KB, patch)
2021-01-25 00:44 PST, youenn fablet
no flags Details | Formatted Diff | Diff

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Description Gustavo Garcia 2017-06-12 06:24:44 PDT
I seems like Safari TP 33 has no support for simulcast streaming, which would be required for multiparty scenarios.  This is supported in Chrome and Firefox for VP8 and there is a patch in progress to add support also for H.264 [1]

The standard way to add simulcast support would be using RtpSender encodings + RID header extensions in the RTP packets [2]

Actual Result:
There is no way to enable simulcast in Safari for H.264.

Expected Result:
Safari supports simulcast for H.264 (and also VP8 if support for that is eventually added)

Build Date & Hardware:
Safari TP 33 on macOS 10.12.5

[1] https://bugs.chromium.org/p/webrtc/issues/detail?id=5840
[2] https://www.w3.org/TR/webrtc/#simulcast-example
Comment 1 Radar WebKit Bug Importer 2017-06-12 08:47:52 PDT
Comment 2 Philip Jägenstedt 2019-02-26 05:39:21 PST
FYI, there's an "Intent to Implement and Ship: Simulcast with PeerConnection AddTranceiver API in WebRTC" for this on blink-dev now:
Comment 3 youenn fablet 2019-02-26 08:33:58 PST
Simulcast activation through munging is supported.
The plan is to transition to addTransceiver
Comment 4 youenn fablet 2021-01-25 00:44:49 PST
Created attachment 418257 [details]
Comment 5 EWS 2021-01-25 09:12:43 PST
Committed r271797: <https://trac.webkit.org/changeset/271797>

All reviewed patches have been landed. Closing bug and clearing flags on attachment 418257 [details].