[Bug 70234] videos are re-thumbnailed when watching with totem

[amnesia]

Public bug reported:

For example an xvid .avi file ist always getting re-thumbnailed, even
while watching the movie. Actually, every time I close totem, I see the
icon change from that temporary "thumbnailing" icon to the real
thumbnail picture (takes about 3 seconds here).

Didn't see this happen with mplayer.

This happens in edgy and dapper.

** Affects: totem (Ubuntu)
     Importance: Undecided
         Status: Unconfirmed

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videos are re-thumbnailed when watching with totem
https://launchpad.net/bugs/70234