1393572 - When starting a webrtc call, audio already playing in other tabs or applications breaks

Status: NEW

(Core :: WebRTC: Audio/Video, defect, P3)

Description

[Nico Grunbaum [:ng, @chew:mozilla.org]]

When starting a webrtc session[0] in a tab (Tab A) while audio is playing[1][2] in another tab (Tab B), the audio from the call works fine, but the audio from Tab B loops a small sample. If I close Tab A, the other tab stops playing audio. If I then start another call (Tab C), the same loop will begin playing again. This continues until I close Tab B.

If I start audio in Tab B after starting a webrtc call, everything works as expected.


[0] https://jsfiddle.net/jib1/qs830j4j/
[1] https://freemusicarchive.org/
[2] https://soundcloud.com/

Comment 1

[Nico Grunbaum [:ng, @chew:mozilla.org]]

This was observed on macOS Sierra 10.12.6 using Nightly.

Version 	57.0a1
Build ID 	20170824100243

Comment 2

[Nico Grunbaum [:ng, @chew:mozilla.org]]

After using mozregression I have not been able to reproduce this.

Comment 3

[Nico Grunbaum [:ng, @chew:mozilla.org]]

A couple of notes: 
It is not limited to other tabs. This happens when I play audio in VLC. 
I can't seem to get it to happen when using my standard MOZ_LOG settings. Given this, I am attempting again to find a regression range.

Comment 4

[Nico Grunbaum [:ng, @chew:mozilla.org]]

10:29.93 INFO: Narrowed inbound regression window from [e4d9cb33, acb1bd24] (3 builds) to [219ca191, acb1bd24] (2 builds) (~1 steps left)
10:29.93 INFO: No more inbound revisions, bisection finished.
10:29.93 INFO: Last good revision: 219ca1919e9b96af351978d00366176ae507304a
10:29.93 INFO: First bad revision: acb1bd24c64d2f24e87930bcff4bace242d1d3a8
10:29.93 INFO: Pushlog:
https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=219ca1919e9b96af351978d00366176ae507304a&tochange=acb1bd24c64d2f24e87930bcff4bace242d1d3a8

This range includes Bug 1381015, which seems like a likely candidate.

CCing Alex.

Comment 5

[Alex Chronopoulos [:achronop]]

Thanks for the description Nico, I will try to repro here.

Comment 6

[Bulk Bug Changes for mreavy's org]

Mass change P1->P2 to align with new Mozilla triage process

Comment 7

[Alex Chronopoulos [:achronop]]

Hi Nico, if I remember well we couldn't repro this in Austin. Can you please try once again, when you can, and tell me if this is still an issue. Thanks.