312281 2026-04-14 09:47:25 -0700 Audio issues observed when joining Cisco Meeting Server meetings using Safari 2026-05-18 07:46:43 -0700 1 1 1 Unclassified WebKit WebRTC Safari 26 Mac (Apple Silicon) macOS 26 RESOLVED FIXED InRadar P1 Major --- 1 sheelasadashiv youennf webkit-bug-importer youennf oldest_to_newest 2200237 0 sheelasadashiv 2026-04-14 09:47:25 -0700 Users joining Cisco Meeting Server meetings via Safari browser experience audio problems that impacts the reliability of audio communication. Steps to reproduce: 1. Join a Cisco Meeting Server meeting from Safari 2. Stay connected for several minutes 3. Observe intermittent audio disruptions Safari version - 26.3.1 macOS - Tahoe 26.3.1 2202787 1 webkit-bug-importer 2026-04-21 09:48:12 -0700 <rdar://problem/175260977> 2210479 2 youennf 2026-05-13 06:14:59 -0700 *** Bug 312908 has been marked as a duplicate of this bug. *** 2210481 3 youennf 2026-05-13 06:18:05 -0700 @Sheela, do you have repro steps that we could use? Is it reproducible using Webex Safari client ? If you can share a sysdiagnose privately (youenn@apple.com), with the time where the issue reproduced, that would be useful too. 2210483 4 youennf 2026-05-13 06:22:11 -0700 Looking at the sysdiagnose in https://bugs.webkit.org/attachment.cgi?id=478546 comment 8, I see that we constantly add/remove the same audio source via IncomingAudioMediaStreamTrackRendererUnit::addSource/removeSource. This is quite unexpected and might trigger some audio issues. @Sheela, can you characterise the audio issues? Is it that audio gets choppy? 2210489 5 youennf 2026-05-13 06:38:16 -0700 I tried reproducing with Webex but could not so far. I did not see all the IncomingAudioMediaStreamTrackRendererUnit logging that I saw in the sysdiagnose. 2210490 6 youennf 2026-05-13 06:41:45 -0700 I can reproduce the IncomingAudioMediaStreamTrackRendererUnit logging when changing of audio speakers. In the sysdiagnose I mentioned, it is as if the page is sometimes trying several times per second to change of audio speaker. 2210854 7 sheelasadashiv 2026-05-14 04:06:37 -0700 (In reply to youenn fablet from comment #4) > Looking at the sysdiagnose in > https://bugs.webkit.org/attachment.cgi?id=478546 comment 8, I see that we > constantly add/remove the same audio source via > IncomingAudioMediaStreamTrackRendererUnit::addSource/removeSource. > This is quite unexpected and might trigger some audio issues. > > @Sheela, can you characterise the audio issues? Is it that audio gets choppy? Yes, the audio is choppy and disruptive, making it difficult to hear clearly. 2210857 8 sheelasadashiv 2026-05-14 04:10:38 -0700 Bumping up the priority to P1, as this issue is being observed by VIPs and executives from multiple customers who are escalating it to Cisco Executives. Therefore, we need a quick fix. 2211647 9 youennf 2026-05-18 00:47:18 -0700 @Sheela, can you provide more info on how to reproduce and/or provide a sysdiagnose? 2211652 10 youennf 2026-05-18 02:04:52 -0700 IncomingAudioMediaStreamTrackRendererUnit logs can happen when adding/removing tracks of the rendered audio. I'll work on a fix to prevent this case. @Sheela, it would be good if you can send me another sysdiagnose that converts this is the root cause. 2211655 11 youennf 2026-05-18 02:13:31 -0700 Pull request: https://github.com/WebKit/WebKit/pull/65094 2211733 12 ews-feeder 2026-05-18 07:46:41 -0700 Committed 313415@main (0ea009b4f3b9): <https://commits.webkit.org/313415@main> Reviewed commits have been landed. Closing PR #65094 and removing active labels.