1360880 - YouTube says "If playback doesn't begin shortly, try restarting your device."

Status: REOPENED

(Core :: Audio/Video: Playback, defect, P2)

Description

[Tim Guan-tin Chien [:timdream] (please needinfo)]

Attachment: Screen Shot 2017-04-30 at 10.44.01 AM.png

STR:

1. Close the laptop lid without closing Firefox
2. A few hours later, open the lid again, login, and try to see some YouTube vidyo.

Expected:

1. Firefox works.

Actual:

1. YouTube says "If playback doesn't begin shortly, try restarting your device"

Note:

Please see screenshot. I've turned on the "Stats for nerds" dialog before taking screenshot and this is what it says:

Resolution:
1920 x 1080@30
Optimal Resolution:
1920 x 1080@30
Volume:
100%
Stream Host:
r3---sn-ipoxu-un5z
Stream Type:
https
CPN:
fbf59TVvFqr2Xc1n
Mime Type:
video/mp4; codecs="avc1.640032"
DASH:
yes (264/251)
Connection Speed:
47339 Kbps
Buffer Health:
32.0 s
Network Activity:
0 KB
Dropped Frames:
-

Comment 1

[Blake Wu [:bwu][:blakewu]]

Tim, 
Thanks for firing this bug. :-)
Just would like to double confirm that you open a tab to watch youtube before you close your laptop lid and would like to resume it after opening the lid, right?

Comment 2

[Tim Guan-tin Chien [:timdream] (please needinfo)]

No. I open the YouTube tab *after* computer goes to sleep (if I remember correctly).

Comment 3

[Blake Wu [:bwu][:blakewu]]

I hit the same problem today. Once this problem happens, no video streaming can work, even in other tab or in new tabs. After checking with JW, it seems a libcube problem since if we play video-only file, it can play well. But if we play local file, it can play well. We have not figured out yet what causes libcube stop reporting audio position on audio streaming cases.

Comment 4

[Blake Wu [:bwu][:blakewu]]

Chunmin, 
Per discussing today, I have kept the environment. Let's see if we could do something to get some ideas from my laptop tomorrow.

Comment 5

[C.M.Chang[:chunmin]]

Sure. It would be better if we could have some debugging information/tools when media elements get stuck.

Comment 6

[C.M.Chang[:chunmin]]

The video will get stuck if cubeb_stream_get_position keeps returning same value. I am not sure if it's the cause. Just guess. Bug 1267511 has similar issue, but there is no enough info for digging into the problem. I think we can start from adding debugging info here.

Comment 7

[C.M.Chang[:chunmin]]

Attachment: guess: block video by stopping returning new audio position

Comment 8

[C.M.Chang[:chunmin]]

Attachment: guess: block video by stopping returning new audio position

The previous patch is not for this bug. Correct it.

Comment 9

[C.M.Chang[:chunmin]]

(In reply to Chun-Min Chang[:chunmin] from comment #6)
> The video will get stuck if cubeb_stream_get_position keeps returning same
> value.
cubeb_stream_get_position keep returning same value means that AudioUnit is deadlocked[0, 1, 2].

[0] http://searchfox.org/mozilla-central/rev/a14524a72de6f4ff738a5e784970f0730cea03d8/dom/media/AudioStream.cpp#503
[1] http://searchfox.org/mozilla-central/rev/a14524a72de6f4ff738a5e784970f0730cea03d8/media/libcubeb/src/cubeb_audiounit.cpp#2642
[2] http://searchfox.org/mozilla-central/rev/a14524a72de6f4ff738a5e784970f0730cea03d8/media/libcubeb/src/cubeb_audiounit.cpp#503-504

Comment 12

[Blake Wu [:bwu][:blakewu]]

It is different from bug 1335512.

Comment 13

[Emma Humphries ☕️🎸🧞‍♀️✨ (she/they) [:emceeaich] (Pacific Time) use needinfo]

This is an assigned P1 bug without activity in two weeks. 

If you intend to continue working on this bug for the current release/iteration/sprint, remove the 'stale-bug' keyword.

Otherwise we'll reset the priority of the bug back to '--' on Monday, August 28th.

Comment 14

[Bulk Bug Changes for mreavy's org]

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

Comment 15

[Blake Wu [:bwu][:blakewu]]

Tim,
Have you seen this bug recently?

Comment 16

[Tim Guan-tin Chien [:timdream] (please needinfo)]

I am not sure... I think I do from time to time.

Comment 17

[Mike Ratcliffe [:miker] [:mratcliffe] [:mikeratcliffe]]

I see this bug on OSX every time there is a Firefox Update... the update downloads but if I don't restart the browser to apply the update then YouTube behaves as described by the OP.

I have heard my wife complaining about the same thing on her Windows laptop.