Thank you for reporting this bug to Ubuntu. Ubuntu 10.10/Maverick reached EOL on 4/10/2012. See this document for currently supported Ubuntu releases: https://wiki.ubuntu.com/Releases
I've tried recreating this bug with Precise and was unable to, given the information you've provided. Please upgrade to the latest version and re-test. If the bug is still reproducible, please provide terminal output of opening an .mkv using totem command in terminal. Do feel free to report any other bugs you may find. ** Changed in: gstreamer0.10 (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gstreamer0.10 in Ubuntu. https://bugs.launchpad.net/bugs/1008943 Title: some files donot play on movieplayer To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gstreamer0.10/+bug/1008943/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs