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Cause: The HTML 5 video implementation of Firefox relies on a bugfix only available in GStreamer versions 1.2 and higher.
Consequence: Versions of GStreamer < 1.2 will cause random seeking problems such as deadlocks and hangs.
Fix: Upgrade to a GStreamer version >= 1.2
Result: Seeking behaviour in HTML 5 video in Firefox is reliable.
Description of problem:
HTML5 videos stop working after some use
Version-Release number of selected component (if applicable):
firefox-31.4.0-1.el7_0.x86_64
xulrunner-31.4.0-1.el7_0.x86_64
How reproducible:
always
Steps to Reproduce:
1. start clean Firefox profile
2. play html5 video (on sites like http://vimeo.com/ or http://video.aktualne.cz/ )
3. jump to several positions in the video
Actual results:
* html5 videos stop playing (loading): loading graphic shows forever
* no more html5 videos from any web site can be played (no matter the refreshes)
* firefox process keeps being around after window close, must be terminated manually (I'll attach a backtrace)
Expected results:
no such problem appears:
* videos can be played and jumped indefinitely
* something wrong in one page should be resolved with reload, with no interference to other tabs
* firefox process always exits after window close
Additional info:
tested in fresh profile in safe mode with all plugins disabled
The mozilla code relies on clearing the audio and video buffer counters when it sees a FLUSH_STOP event on the appsink sinkpad using a probe.
In 1.0, however there was a bug where the probe would not be emitted for FLUSH_STOP which would then cause:
- mVideoSinkBufferCount and mAudioSinkBufferCountare not cleared
- DecodeAudioData() blocks the mGstThreadsMonitor
- DecodeAudioData() tries to pull a sample from the appsink and blocks
- meanwhile new samples are pushed into appsinks, which causes NewVideoBuffer()
and NewAudioBuffer to be called.
- NewVideoBuffer() and NewAudioBuffer try to lock mGstThreadsMonitor and
deadlock
543b92a856b81b0a07e99fc27dc4aa6de3c0aeb7 that was released in 1.2 should fix it. Since we rebase to 1.4 in RHEL7.2 this issue should be fixed automatically.
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://rhn.redhat.com/errata/RHEA-2015-2221.html