Hi MrTibs,
I used FilterFactory once (just for one hour), to test an idea i had. (Btw. Later, i realized the idea with existing avisynth functions().
http://forum.doom9.org/showthread.php?s=&threadid=35923) Here's the link for FilterFactory:
http://forum.doom9.org/showthread.php?s=&threadid=35493
There you can find a link to the only documentation i could find for filterfactory. I also stated there that filterfactory is very limited and only works in RGB colorspace, so most of the work is done for converting from YUV2 to RGB and back. Filterfactory is also _veeery_ slow. whis is no surprise...
It would be a great idea to develop a more powerful version of filterfactory (for avisynth, i'd say) that has capabilities to do some standard tasks through precompiled (MMX, SSE, 3dnow!) code (e.g. colorspace conversion, convolution, dct, idct, ...)
This would be a great tool to do some rapid prototyping when having an idea!
bye,
Malcolm