Public bug reported:

I'm using WebKitGtk (with PyGI and Python3, although my hunch is that's
irrelevant) for a video browser.

Playback using the <video> element works awesome, but when I switch from
one video to the next by changing the video.src from the DOM with
JavaScript, I get this error in the terminal:

GStreamer-WARNING **: wrong STREAM_LOCK count 0

Once this happens, the app freezes up.  The next video doesn't play, and
I can't do anything... not even close the app.  After the timeout, I can
force quite.

Haven't yet spotted a pattern to this.  It doesn't happen every time...
sometimes I can play, say 5 videos or so before this happens.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: libwebkitgtk-3.0-0 1.6.1-5build1
ProcVersionSignature: Ubuntu 3.2.0-6.12-generic 3.2.0-rc6
Uname: Linux 3.2.0-6-generic x86_64
ApportVersion: 1.90-0ubuntu1
Architecture: amd64
Date: Tue Dec 20 02:08:35 2011
EcryptfsInUse: Yes
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Beta amd64 (20110921.2)
SourcePackage: webkit
UpgradeStatus: Upgraded to precise on 2011-12-01 (18 days ago)

** Affects: webkit (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug dmedia novacut precise running-unity

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https://bugs.launchpad.net/bugs/906784

Title:
  GStreamer-WARNING **: wrong STREAM_LOCK count 0 after changing HTML5
  video.src

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