Can you reproduce this on latest feisty? Also can you please provide some more information about the actual codec used in the file, mkv (matroska) is only a container format that could contain almost everything
** Changed in: gstreamer0.10-ffmpeg (Ubuntu) Sourcepackagename: gstreamer0.10-ffmpeg => gst-plugins-good0.10 Status: Unconfirmed => Needs Info -- HR matroska playback very slow https://launchpad.net/bugs/64258 -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs