https://bugzilla.wikimedia.org/show_bug.cgi?id=41909
Web browser: ---
Bug #: 41909
Summary: Playing a large Theora file causes Firefox to lock up
with 100% CPU
Product: MediaWiki extensions
Version: unspecified
Platform: All
URL: http://commons.wikimedia.org/wiki/File:Webcam_CT_trans
missions.OGG
OS/Version: All
Status: NEW
Severity: normal
Priority: Unprioritized
Component: TimedMediaHandler
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected], [email protected]
Classification: Unclassified
Mobile Platform: ---
Today, a 26MB video file was featured on the English Wikipedia main page, see
URL field above. Clicking the "play" button in Firefox causes the browser to
become unresponsive, using 100% of one core. The browser does respond to clicks
after a delay of 10s or so, but never appears to repaint. Closing the tab is
possible and causes the CPU usage to stop.
Observed with the current version of Firefox on Ubuntu 12.04, with a default
profile and in safe mode.
Playing the same file using Firefox's video capabilities but without TMH
involved does work. Once the file is loaded into the browser's cache, the bug
stops happening and the video will play correctly. The bug can be reproduced
again by clearing the cache with the "clear your recent history" feature.
I tried enabling EmbedPlayer.NativeControls but it didn't help.
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