1559521 - twitch stream pausing

Status: NEW

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

Description

[kokispro1]

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:67.0) Gecko/20100101 Firefox/67.0

Steps to reproduce:

Opened https://www.twitch.tv and watched a stream.

Actual results:

The stream froze every now and then and had to be paused and unpaused in order for it to play again.

Expected results:

Stream shouldn't have frozen/paused in the first place

Comment 2

[Darkspirit]

(kokispro1 from comment #0)

Firefox/67.0

Oops, then this is not a duplicate of bug 1559284. Sorry!

Comment 3

[Darkspirit]

Could you please open about:support, click on "Copy text to clipboard", paste it into a text file and upload it here (Attach File)? Thanks!

Comment 4

[kokispro1]

Attachment: info.txt

Comment 5

[Darkspirit]

Failure Log
(#0) Error: WMF VPX video decoding is disabled due to a previous crash.
(#49): CP+[GFX1-]: WMF VPX video decoding is disabled due to a previous crash.
[...]

Comment 6

[Bryce Seager van Dyk [:bryce] (he/him) - Not reading bugmail]

I believe I've seen this issue. To make sure we're seeing the same thing, does the audio keep playing while the video is paused?

Comment 7

[kokispro1]

The audio does not keep playing if I remember correctly. I'd say I'm 75% sure it doesn't keep playing but I'll have to confirm once it happens again.

Comment 8

[kokispro1]

Scratch that. The audio does keep playing!

Comment 9

[Bryce Seager van Dyk [:bryce] (he/him) - Not reading bugmail]

Thanks for checking and confirming that. I'm pretty sure I've seen the same issue on my home desktop. Audio continues, but video freezes and doesn't resume even after waiting for minutes. Pausing and resuming the video gets the video playing again. Sometimes happens within minutes, sometimes can watch for hours without issue.

I've seen this on nightly, updating flags accordingly.

I am traveling, but will ad my relevant system info to this bug next week and will try and dump more info.

Comment 10

[Darkspirit]

(Just to mention it even though comment 4 is not using WebRender: bug 1553969 could still occur on 67 when using an alternative Twitch player.)

Comment 12

[Andreas Pehrson [:pehrsons]]

Bryce, have you had any chance to get back to this? If you can narrow down what it takes to reproduce, perhaps we can find someone else that's also able. Bug 1571282 makes it sound like it can be repeated consistently.

Comment 13

[Bryce Seager van Dyk [:bryce] (he/him) - Not reading bugmail]

I've been keeping an eye out, and see it still happening, but do not have a reliable repro. My current conjecture:

• The issue may be load based. Often see it at the start of twitch streams, which I imagine is a high load state due to filling buffers and what not.
  • I usually see this on my personal machine while I'm watching a stream and playing games myself. If I see this happening mid stream, it's possibly the result of the game increasing load.
• The issue is not impacted by if twitch is in high or low latency mode, I've seen it happen in either. That said, if you're stalled and switch modes it will break the stall (much like changing resolution or pausing and playing).

I normally repro this on a personal machine, which is not as setup for Firefox debugging as my dev devices. However, this is something that I'd like to take some more time to look at. Holding NI.

Comment 14

[Bryce Seager van Dyk [:bryce] (he/him) - Not reading bugmail]

Jeffery, you mentioned in bug 1571282 that you see this when you start a twitch video. Are you seeing this with live streams as well as VoDs? Does it always happen every time you open a video, or only sometimes?

Comment 15

[jeffreylam221]

Both live streams and VoDs I am facing the problem. From my experience today. The freezing happens every time I play the video, even if I replay it or drag back the time.
https://clips.twitch.tv/SincereAntediluvianNeanderthalUnSane
For this video, It consistently freezing at 1-8 seconds. The sound and video time will keep going. In Chrome, I can play this video very smoothly.

PS: I have a video recorded my screen but I don't find a place to upload it.

Comment 16

[Bryce Seager van Dyk [:bryce] (he/him) - Not reading bugmail]

Thanks for the update! There's an "Attach New File" button at the bottom of the header on this bug that should let you upload your recording to this bug -- it would be useful to see.

If you force the video resolution/quality to be really low on the twitch video, does it still stall?

Comment 18

[BugBot [:suhaib / :marco/ :calixte]]

Redirect a needinfo that is pending on an inactive user to the triage owner.
:jimm, since the bug has high priority, could you have a look please?

For more information, please visit auto_nag documentation.

Comment 19

[ssamet.samo]

Hello,
I am having the same problem with the latest version of Mozilla,
I have good internet 300 mbps and PC setup rtx 3080, dual monitor,

Problem as described above:
Freezes time to time frequently, audio continues, stream video freezed, if you want to continue stream video, you need to pause and play or refresh the current stream tab.

Thank you in advance.

Comment 20

[ssamet.samo]

Attachment: OK

Comment 21

[ssamet.samo]

Comment on attachment 9301547 [details]
OK

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