Hi The files play nice in totem there is no problem and they are all matroska files with the mimetype video/x-matroska. Attached is an example in jaunty it shows the Ubuntu logo in Karmic a thumbnail is produced. If there is something else I can do let me know.
** Attachment added: "example.mkv" http://launchpadlibrarian.net/32633665/example.mkv -- videos embedded pictures are no longer used as thumbnails https://bugs.launchpad.net/bugs/437580 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs