Closed Bug 1067558 Opened 7 years ago Closed 6 years ago

[E10S] The HTML5 YouTube player freezes video with only audio still playing


(Core :: Audio/Video, defect)

Windows 7
Not set



Tracking Status
e10s m3+ ---


(Reporter: achwaqkhalid, Assigned: handyman)



User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:29.0) Gecko/20100101 Firefox/29.0
Build ID: 20140915030204

Steps to reproduce:

- Go to YouTube opt-in for the HTML5 player at ( assuming that E10S is enabled this will take 3 times to load in comparison to a non e10s window (see here:

- Click on a video

Actual results:

- The video will freeze after 3 to 5 seconds of playback with only the audio still playing

NB: MSE is already enabled in About:config

Expected results:

You already know ;)
Blocks: e10s
Depends on: 1000686
Are you testing with Firefox 29 or a Nightly build?  MSE isn't expected to work in 29, you need to be testing against Nightly.
(In reply to Matthew Gregan [:kinetik] from comment #1)
> Are you testing with Firefox 29 or a Nightly build?  MSE isn't expected to
> work in 29, you need to be testing against Nightly.

No! i'm of course on the latest nightly channel 35.0a1
Component: Untriaged → Video/Audio
Product: Firefox → Core
Version: 29 Branch → Trunk
tracking-e10s: --- → ?
See Also: → 1067785
See Also: 10677851064847
Assignee: nobody → davidp99
I can confirm that, especially when you start scrolling down fast with video playing. Problem is that happens with flash as well.
I don't think the issue depends solely on e10s! With it disabled i still experience this issue even with embedded videos, enabling e10s will just add up
Turns out this was a duplicate - bug 1077086.
Closed: 6 years ago
Resolution: --- → WORKSFORME
Duplicate of bug: 1077086
1st - I don't know about you guys but i'm still dealing with this issue (The YouTube video will freeze after 3-5 seconds with only audio playing and then resume later

2nd - why would this be marked as duplicate of bug 1077086 ?!! that video plays fine for me, while this bug is about the YouTube player...


- i'm running 230 tabs (23 are fully loaded, 4 pinned)

- dom.ipc.processCount is set to 4
Flags: needinfo?(epinal99-bugzilla)
Flags: needinfo?(davidp99)
Resolution: DUPLICATE → ---
Hi Achwaq,

The bug you are describing is different than the bug in the initial description.  The initial description doesn't mention video resuming later.  To debug it, I used these steps:

0. Set media.mediasource.enabled
1. Open an e10s window
2. Go to youtube and play a video

The video would play for about 3-5 seconds (different each time) and then freeze.  Usually, the audio would continue but sometimes not.  This was exactly the reported behavior for this bug and it is similar to the behavior described in bug 1077086... and it is gone with that patch (indeed, I just re-verified this).

I have not seen behavior where the video pauses for an extended period (how long?) but eventually resumes.  If you still see this and you believe that it's not a network issue then feel free to file a new bug describing that behavior.  Please be sure to provide a detailed description and complete steps to reproduce it.
Flags: needinfo?(epinal99-bugzilla)
Flags: needinfo?(davidp99)
Yes David, I confirm that it's not a network problem since the buffering is still occurring (i even restarted my router to get rid off any network problem possibility) and according to a network monitoring tool only firefox is using the network at that moment, i didn't mention that the video will resume later because it's arbitrary (sometimes it resumes, sometimes it doesn't)

the hang period (video freeze) depends on how busy the main parent firefox.exe is (how many tabs are open, how many child process are loaded (dom.ipc.processcount) and for how long the browser was running....) unless i'm wrong i don't think we are experiencing with the same running environment since i have 230+ tabs now and my machine is running 7 days per week + firefox is always running (restart just for updates)

the only workaround that i'm using so far is when opening a YouTube video link i will pause it at 0-1 second until firefox.exe is free enough and then resume the playback (although sometimes this doesn't work)
I'm reclosing this as a duplicate.  Achwaq, you can file a new bug for the behavior you are seeing.  If you do, please include the information you posted in comment 10 as well as anything else that might be relevant to reproducing the behavior.  In particular, be sure to mention any settings that you might have manually changed.  This can be easily done by posting the Troubleshooting Information (from the Firefox '?' menu).

FYI, things like settings values and somewhat unusual things like "I have many, many tabs open" or "I've been running for many weeks straight" affect our debugging process.  Making these points upfront will help a lot.

For the time being, I'd recommend not changing dom.ipc.processcount from its default value.
Closed: 6 years ago6 years ago
Resolution: --- → DUPLICATE
Duplicate of bug: 1077086
I am seeing this too with youtube MP4 content using the MSE/DASH player.

Can reproduce it consistently...

Behaviour is a few video frame appearing still from time to time... audio is good
Well! funny how disabling Adblock Plus actually will fix all my previously reported e10s issues, the freeze at the beginning of the video is gone now.

but as mentioned in comment 18 by Cresto in bug 1060406 why is this "layers.acceleration.force-enabled" not enabled by default?
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