I made some experiments with some files having top running alongside and
ready to fire `pkill nautilus`: looks like I found a testcase to
reproduce this. Make a directory, put video file in mkv container
(matroska) into it (mv file to that directory with shell) and watch for
nautilus eating memory. It looks like this: file appears in directory,
gnome-video-thumbnailer eats some cpu making its job, then movie
thumbnail appears instead of standard videotape icon, and nautilus cpu
usage begin to increase, as its memory consumption. If not killed, its
residual memory goes up to all available, then virtual memory jumps up
to 1 gib (I've got 1gib installed), everything else swaps out till
system stops responding.

Tried this on different mkv files: with Xvid, h.264 video, different
audiostreams (mp3, ac3), resolutions (nearly-vga to hdtv) -- all the
same.

-- 
nautilus eat memory, locks desktop
https://bugs.launchpad.net/bugs/187547
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