Try running them from a terminal/console and see if they (totem/mplayer)
produce any error output.
Then add it here :-)
** Changed in: totem (Ubuntu)
Status: New => Incomplete
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totem + mplayer dont start playing films (avi, mov etc)
https://bugs.launchpad.net/bugs/404407
You received t
Could you provide some instructions to reproduce this?
For instance, did you open the video clip by clicking it, or from the
menus within Totem?
Also, if possible, could you provide info about the file path and perhaps also
the filename?
(Could it for instance be caused by special characters?)