A workaround I just found:
go to /usr/share/thumbnailers
edit totem-video.thumbnailer
instead of using totem-video-thumbnailer use ffmpegthumbnailer -i %u -o %o 
after having installed it
then cancel the folder ~/.thumbnails/
Finally logout and login

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https://bugs.launchpad.net/bugs/977048

Title:
  Totem fails to play mp4 files originating from youtube

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

Bug description:
  In precise beta 2, Totem fails to plays mp4 files downloaded from youtube via 
Minitube or the Firefox DownloaHhelper plugin.
  Totem does not crash, but displays a black screen.

  As a result, totem-video-thumbnailer fails to create a proper snapshot to be 
used as a thumbnail for those videos in Nautilus (it aborts with a 
  "totem-video-thumbnailer couldn't process file: 'video.mp4'
  Reason: Took too much time to process."
  error message)

  This is a regression as everything was fine in 11.10 using the same
  videos. Moreover, other media players such as VLC or SMPlayer have no
  trouble playing the video.

  Steps to reproduce
  - Download a video from youtube using minitube or the DownloadHelper Firefox 
plugin
  - check that Nautilus does not display a snapshot of the video as a thumbnail
  - check that Totem fails to properly plays the video, although it does not 
crash
  - check that it is not the case in 11.10

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: libgstreamer0.10-0 0.10.36-1
  ProcVersionSignature: Ubuntu 3.2.0-22.35-generic-pae 3.2.14
  Uname: Linux 3.2.0-22-generic-pae i686
  ApportVersion: 2.0-0ubuntu4
  Architecture: i386
  Date: Mon Apr  9 10:11:47 2012
  InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release i386 (20110427.1)
  SourcePackage: gstreamer0.10
  UpgradeStatus: Upgraded to precise on 2012-03-29 (10 days ago)

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