Does not look like a libav bug to me. Decide if you want -extra or not and install the packages accordingly.
** Changed in: libav (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to libav in Ubuntu. https://bugs.launchpad.net/bugs/1418145 Title: package libavcodec53 (not installed) failed to install/upgrade: conflicting packages - not installing libavcodec53:i386 Status in libav package in Ubuntu: Invalid Bug description: i cant play media files wirthout this ProblemType: Package DistroRelease: Ubuntu 13.10 Package: libavcodec53 (not installed) ProcVersionSignature: Ubuntu 3.11.0-26.45-generic 3.11.10.12 Uname: Linux 3.11.0-26-generic i686 ApportVersion: 2.12.5-0ubuntu2.2 AptOrdering: libavcodec53: Install libavutil-extra-51: Configure libavcodec53: Configure Architecture: i386 Date: Wed Feb 4 23:09:59 2015 DuplicateSignature: package:libavcodec53:(not installed):conflicting packages - not installing libavcodec53:i386 ErrorMessage: conflicting packages - not installing libavcodec53:i386 InstallationDate: Installed on 2015-01-22 (13 days ago) InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release i386 (20131016.1) MarkForUpload: True SourcePackage: libav Title: package libavcodec53 (not installed) failed to install/upgrade: conflicting packages - not installing libavcodec53:i386 UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/libav/+bug/1418145/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp