Feature request for ffdshow:chroma interpolation

[CavalloPazzo]

To Milan:
I asked 4 it some times ago into another thread (http://forum.doom9.org/showthread.php?s=&threadid=27676) and you said "I could try to use xvid (or mplayer) colorspace conversion routines to convert YV12 to RGB, force RGB output from ffdshow and see the results".
I completely forgot about my request (maybe you too) since I read this post on Xvid forum
http://www.xvid.org/modules.php?op=modload&name=phpBB2&file=viewtopic&t=814

requesting the same thing. This thread also contains a comparison in which it's possible to see how images looks with and without chroma interpolation.

Now a question (maybe stupid because I'm not an expert): Interpolation is possible only coverting to RGB or even converting to planar YUV (this should be less cpu demanding).
Thnks

[vinouz]

Yes. On my first DVD encode, which was "les rivières pourpres" (a french movie), I noticed the beginning titles, which were plain red, had this problem. As I saw it on our home DVD, these 2x2 blocks didn't appear, I was a bit surprised thinking that chroma wasn't interpolated (was DivX4.12) on DivX. (as this is quite simple. You certainly can just have a simple add/sar interpolation. It's quick, easy to code and gives quite good effect. On plain resolution doubling, this simple optimised bilinear gives almost no difference with bicubic). But yes there wasn't.
Anyways the problem is not so big, as all previous encodes will benefit from this little thing whenever it's done.
But I'd really appreciate to see it soon :).

BTW, thanks Milan for all your great work.