Updated mediawiki/extensions
Project: mediawiki/extensions/TimedMediaHandler  7710d019e8e3d46a302fef055e83044bc0d6034d
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seek up to 3 seconds before seekpoint to extract frames

default keyframe interval is 64 frames in GStreamer and ffmpeg2theora.

Change-Id: I57c15057697434920003275941c824428454d0c2