OK the Totem developers at GNOME Bugzilla say this is a packaging problem and that "Some libraries that the gst-libav package relies on are missing." If I try "apt-cache search gst-libav" I see this is "gstreamer1.0-libav", which is already installed.
I have followed their advice and filed a new bug for the gst-libav1.0 package: https://bugs.launchpad.net/ubuntu/+source/gst- libav1.0/+bug/1751769 -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to totem in Ubuntu. https://bugs.launchpad.net/bugs/1751578 Title: Totem no longer plays MP4s, despite correct plugins installed Status in totem package in Ubuntu: Incomplete Bug description: Recently I tested several video players, and after uninstalling them I can no longer view MP4 videos. I do have the necessary gstreamer plugins installed, however Totem incorrectly reports "Required plugin could not be found". I've posted a related question here: https://askubuntu.com/questions/1008762/how-can-i-restore-totems- ability-to-play-mp4-videos I'm on Ubuntu 16.04.4 LTS running Totem 3.18.1-1ubuntu4 --- ApportVersion: 2.20.1-0ubuntu2.15 Architecture: amd64 DistroRelease: Ubuntu 16.04 InstallationDate: Installed on 2017-07-21 (219 days ago) InstallationMedia: Ubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64 (20170215.2) Package: libgstreamer1.0-0 1.8.3-1~ubuntu0.1 PackageArchitecture: amd64 ProcVersionSignature: Ubuntu 4.13.0-36.40~16.04.1-generic 4.13.13 Tags: xenial Uname: Linux 4.13.0-36-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: _MarkForUpload: True To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/totem/+bug/1751578/+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
