1152580 - MSE YouTube 4K video stops playing/unable to toggle "Play" + "Pause" controls

Status: RESOLVED WORKSFORME

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

Description

[Stephen Donner [:stephend] Not actively reading bugmail]

(Please note, the steps to reproduce in this comment don't directly correlate to the log I'll attach/link to -- but they should help.)

Build ID: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:40.0) Gecko/20100101 Firefox/40.0

Display adapter type NVIDIA Quadro K600
  Total available graphics memory 17123 MB
        Dedicated graphics memory 1024 MB
        Dedicated system memory 0 MB
        Shared system memory 16099 MB
  Display adapter driver version 9.18.13.4752
  Primary monitor resolution 1920x1200
  DirectX version DirectX 10 

STR:

1. On desktop nightly, load https://www.youtube.com/watch?v=I54vzcQmnKY
2. Play around with setting it to 4K, letting it buffer/play a bit, then dropping it down to 240p/360p, again letting it buffer, then playing
3. Soon after #2 starts playing, go back to the beginning of the video, and now change to 4K

Expected Results:

1. Starts buffering at/to 4K video, then playing eventually
2. The "Pause" button should let you toggle back to "Play"

Actual Results:

1. Appears to be stuck (AJAX spinner), although I do see a few GET requests for the thumbnails, if I hover over the seek bar
2. Toggling Pause/Play button has no effect

(Here's a screencast, which, again, sorry, doesn't directly correlate to the STR given or the log file, but exhibits the problem.)

Comment 1

[Stephen Donner [:stephend] Not actively reading bugmail]

I'm unable to attach the logfile due to its size, so here it is: https://drive.google.com/a/mozilla.com/file/d/0B_gOai245yuJUHBHUzhiaHpUcDg/view?usp=sharing

Comment 2

[Stephen Donner [:stephend] Not actively reading bugmail]

And, sorry, forgot the link to the screencast (it's in Flash): http://screencast.com/t/x6nZD7B9

Comment 3

[Stephen Donner [:stephend] Not actively reading bugmail]

In case it helps further, here's a new screencast + logfile, which both directly correlate, showing the same problem.

Build ID: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:40.0) Gecko/20100101 Firefox/40.0

Built from: https://hg.mozilla.org/mozilla-central/rev/1ad65cbeb2f4

1) Screencast: http://screencast.com/t/5HvBErXl
2) Logfile: https://drive.google.com/a/mozilla.com/file/d/0B_gOai245yuJVzBvUG84Q1dlZGM/view?usp=sharing

Comment 4

[Anthony Jones (:ajones, :kentuckyfriedtakahe, :k17e)]

4k works pretty well these days. Is this still an issue for you?

Comment 5

[Stephen Donner [:stephend] Not actively reading bugmail]

(In reply to Anthony Jones (:kentuckyfriedtakahe, :k17e) from comment #4)
> 4k works pretty well these days. Is this still an issue for you?

Sorry for the delay in responding; I haven't seen this since.

Marking as WORKSFORME.