Bug 189690 – [MacOS] Firefox subscribing to WebRTC H.264 video coming from Safari 12 freezes

• Component: WebRTC
• Status: RESOLVED FIXED

[Adam]

Today Safari updated to 12 and I noticed that it broke WebRTC video going to Firefox.

Steps to repro:

1. Go to app.rtc (or talky.io, or meet.tokbox.com) on Safari 12 and join a room.
2. Join the same room in Firefox 62 (or 60)

Result: The video displays and then immediately freezes in Firefox.

The same issue is not there for Safari 11, it is also not there if you use Safari on iOS 12, only on Desktop from Mac OS.

I filed a bug with Mozilla about this as well https://bugzilla.mozilla.org/show_bug.cgi?id=1492038

[Radar WebKit Bug Importer]

<rdar://problem/44546919>

[youenn fablet]

Thanks for the report.
I am not able to reproduce that myself with STP 65/Firefox 64 in https://safari.opentokrtc.com/.
Could you provide more information on the setup (Firefox in which OS, MacOS hardware)?

[Dag-Inge Aas]

Created attachment 350014 [details]
opentok-firefox-nightly-safari-12

[Dag-Inge Aas]

I was able to replicate this issue in Firefox Nightly 64.0a1 (2018-09-17) as well as stable in Confrere. Attached you'll find a screenshot of the error on OpenTok as well in Firefox Nightly (Stable just crashes when I try to enter that url).

Let me know what else you need, youenn

[Dag-Inge Aas]

I was not able to reproduce the issue with Safari Technology Preview Release 65 (Safari 12.1, WebKit 13607.1.5.2).

My setup is:
macOS High Sierra version 10.13.6
Macbook Pro 15 inch 2017
2,9GHz Intel Core i7
16GB LPDDR3
Radeon Pro 560/Intel HD Graphics 630

[youenn fablet]

Thanks Daginge, I was able to reproduce the issue on Safari 12.

[Adam]

Mozilla say this seems to be an encoder error on the Safari side:
https://bugzilla.mozilla.org/show_bug.cgi?id=1492038#c21

[youenn fablet]

Fixed on Firefox side.