In Ubuntu 11.10, I can't play .mkv and some .flv videos in Totem (some other .flv videos do work). I don't get any messages, they just don't play. I see only the first frame of the .mkv or .flv video freezing on Totem where it says "Playing" at the left-bottom, the time stays 0:00 / 0:00 and the audio is automatically muted every time I play any .mkv or .flv video.
When I right click in Nautilus to see the properties of these not-playing files I get a popup window saying "Creating Properties window. You can stop this operation by clicking cancel." -- and that is all I get. From the files that do play, I do get a properties window.
DistroRelease: Ubuntu 11.10
Package: libgstreamer0.10-0 0.10.35-1
ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
Uname: Linux 3.0.0-12-generic x86_64
Date: Thu Nov 3 19:21:35 2011
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111011)
PATH=(custom, no user)
UpgradeStatus: No upgrade log present (probably fresh install)