This is actually bug in ATI drivers.
When you request info about brightness etc and if it's supported at all, ATI
reset all to 0.
This happens if you are using ffdshow.
When you press Play, FFDshow will try to get info, if color controls are supported and ATI reset them to 0.
It's not visible in other players, because they use default video renderer and usually they not provide interfaces for color controls.
Try to disable FFDshow and it won't be reset to 0 anymore.
You can reproduce this for ex. in graphedit, if you insert Overlay mixer (which provides interface for setting brightness, contrast etc) and ffdshow and then render file.
Or try to force other players to use Overlay mixer and it will be the same.
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