I reinstalled Utopic completely and the bug disappeared. (Before it was an upgrade from Trusty.)
** Changed in: gstreamer1.0 (Ubuntu) Status: New => Fix Released -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gstreamer1.0 in Ubuntu. https://bugs.launchpad.net/bugs/1391415 Title: totem does not play H264 any more Status in “gstreamer1.0” package in Ubuntu: Fix Released Bug description: Totem does not play H264 videos any more. It used to play them one or two weeks ago. Container does not matter, .mp4 and .mkv both don't work. AAC audio-only files do work (.m4a or .mkv containers.) If started from terminal, totem does show exactly the same messages when launched with MP4 like with WebM. But MP4 does not play, while WebM just works. Ubuntu version: 14.10 Video card: 00:02.0 VGA compatible controller: Intel Corporation Device 0a2e (rev 09) ubuntu-restriced-extras is installed. I tried to reinstall all gestreamer, totem and xorg-video-* packages. ProblemType: Bug DistroRelease: Ubuntu 14.10 Package: libgstreamer1.0-0 1.4.3-1 ProcVersionSignature: Ubuntu 3.16.0-24.32-generic 3.16.4 Uname: Linux 3.16.0-24-generic x86_64 NonfreeKernelModules: wl ApportVersion: 2.14.7-0ubuntu8 Architecture: amd64 CurrentDesktop: Unity Date: Tue Nov 11 09:32:41 2014 EcryptfsInUse: Yes InstallationDate: Installed on 2014-10-08 (33 days ago) InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2) SourcePackage: gstreamer1.0 UpgradeStatus: Upgraded to utopic on 2014-10-17 (24 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gstreamer1.0/+bug/1391415/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp