Thomas,

Your patch is a good start towards getting this fixed, but it's not
working correctly yet. I noticed you said it was a rounding issue, can
it be fixed? In case you think that decreasing these values by just a
few points isn't bad, remember that the values get decreased upon *each*
invocation of totem (and possibly other players), again and again. After
about 5-6 invocations, totem causes XVideo output to become washed out.

To illustrate:
1. Fresh start -> first totem invocation
   Name: XV_COLORKEY
-   Current value: 66046
+   Current value: 66051
   Name: XV_BRIGHTNESS
    Flags: XvGettable XvSettable 
-   Current value: 0
+   Current value: -1
   Name: XV_CONTRAST
-   Current value: 128
+   Current value: 126
   Name: XV_SATURATION
-   Current value: 512
+   Current value: 509

2. Fresh start -> second totem invocation
   Name: XV_COLORKEY
-   Current value: 66046
+   Current value: 66051
   Name: XV_BRIGHTNESS
-   Current value: 0
+   Current value: -2
   Name: XV_CONTRAST
-   Current value: 128
+   Current value: 124
   Name: XV_SATURATION
-   Current value: 512
+   Current value: 506

Etc.

Again, my video card: 00:02.0 VGA compatible controller: Intel
Corporation 82852/855GM Integrated Graphics Device (rev 02)

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