I am having the same problem with 7.10.

I have a very old and dark HP D2808 monitor.
In my /etc/X11/xorg.conf file, I have set this line 
  Gamma   1.6
to adjust the gamma correction.

However, in Ubuntu 7.10 Gutsy Gibbon, XVideo does not respect the X
Window system-wide gamma correction setting.

As a workaround, I can use xvattr to turn up the brightness, like so:
  xvattr -a XV_BRIGHTNESS -v 24
This is of course an imperfect substitute, because brightness != gamma, however 
it makes eg. RealPlayer XVideo and Totem Xvideo  videos watchable.

Despite the workaround, I feel that it is very important that the bug be
fixed and XVideo be made to respect gamma values and other settings.

-- 
totem overrides XV_CONSTRAST to wrong default value (Xv movies on i810/i945 
have horrible colour/gamma)
https://bugs.launchpad.net/bugs/32963
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