I think the problem is not exactly gstreamer related, although it affects most 
gstreamer-based players, and all non-gstreamer players work fine.
The reason I think it is not gstreamer-related is that the following command 
seems to successfully play the problematic files:

gst-launch-0.10 playbin uri=file:///<problematic file>

I assume gst-launch-0.10 will use the same gstreamer backend that totem
and other gstreamer players as using. I have no clue why they fail and
gst-launch works, but I thought this might help find out exactly where
the problem comes from.

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https://bugs.launchpad.net/bugs/973014

Title:
  Fails to decode many common video files encoded as AVC 1 Baseline -
  L2.1, Baseline - L1.1

Status in “gstreamer0.10” package in Ubuntu:
  Confirmed

Bug description:
  *Adjusted description so as not to show as email to non logged in people
  Most affected files are   [email protected], [email protected] *

  Those would be the most likely to fail to be decoded but not limited to.
  These files are commonly found online though many users will have locally.
  Also affected  other than totem, banshee would be the mozilla-plugin & 
minitube.
  Typically the audio will play with no video though sometimes neither

  Attached is a cut small sample file, noting the file plays fine in all non 
gstreamer players & in all gstreamer players in 11.10 & earlier
  The file should be playable in totem, banshee & firefox with totem-mozilla 
plugin installed but only audio is decoded

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: libgstreamer0.10-0 0.10.36-1
  ProcVersionSignature: Ubuntu 3.2.0-21.34-generic-pae 3.2.13
  Uname: Linux 3.2.0-21-generic-pae i686
  NonfreeKernelModules: nvidia
  ApportVersion: 2.0-0ubuntu3
  Architecture: i386
  Date: Tue Apr  3 21:33:08 2012
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Beta i386 (20120301)
  ProcEnviron:
   TERM=xterm
   PATH=(custom, user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: gstreamer0.10
  UpgradeStatus: No upgrade log present (probably fresh install)

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