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.
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.