change filter settings with GUI while playback

[hanfrunz]

Hello,

i'd like to to code an extension for my 3d-anaglyph filter. Sometimes it is neccesary to move one frame (let's say the left camera) a few pixels to enhance the 3D effect. Now i'd like to do this while playing. So all i need is a window poping up with 4 buttons (up,down, left and right). I saw something like that in the AVSMonitor filter. But the source code is a little bit too comment-less for me... ;)
Maybe somebody has the time to make another "Easy filter sample with external window" for me and all the others? I think it would be very, very cool changing filters while playing to find the best settings.

thanks,
Hanfrunz

[mf]

Such functionality like this:
DynamicParams(Filter())

would be sweet. I wonder if it'd work at a reasonable reaction speed though.