totem/Nautilus does not correctly play/preview some mp4 video files

[davros]

Nautilus previews do not display for some mp4 files. Totem does not play these files correctly. Audio plays, video does not. These worked in prior versions of Ubuntu and they also currerntly work with mplayer.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: libgstreamer0.10-0 0.10.36-1ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-26.41-generic-pae 3.2.19
Uname: Linux 3.2.0-26-generic-pae i686
NonfreeKernelModules: nvidia
ApportVersion: 2.0.1-0ubuntu8
Architecture: i386
Date: Mon Jul 9 21:10:02 2012
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release i386 (20120423)
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: gstreamer0.10
UpgradeStatus: No upgrade log present (probably fresh install)

[astro (bernard-godard)]

I have the same problem on 2 different systems with Ubuntu 12.04 (32 and 64 bits). I confirm
this was not a problem before 12.04.

Those videos still play OK in xine, vlc, mplayer.

See attached picture showing media information from VLC for 2 MP4 files:
- the one which has video in stream #0 and audio in stream #1 plays with totem-gstreamer and previews in nautilus.
- the one which has video in stream #1 and audio in stream #0 does not play with totem-gstreamer and does not preview in nautilus.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[astro (bernard-godard)]

My hypothesis that this happens only for MP4 media with audio in stream#0 is incorrect: I took a file that does not play with audio in stream#0 and video in stream#1 and reverted the order of the streams with MP4Box and totem still fails to play the file.