Colorspace Conversion Nightmare

I'm a little frusrated right now, so bear with me. I know the developers here are mostly volunteering their work, but could people PLEASE compile filters that work in all colorspaces? I am having a nightmare in converting a particular clip. I have a RGB32 avi video of the Return of the King cartoon. It appears to be progressive (no interlacing at all) @29.97fps (every fifth frame is a repeat). It also has a moderate amount of noise. Using AVISynth 2.51, I am encoding with Nandub so the output must be either RGB or YUV. Right off the bat, Decimate does not accept RGB32, so I must convert to YUV or YV12. But then I apply Msmooth, and it does not accept YUV! Only RGB32 or YV12. BUT WAIT THERE'S MORE! Then I want to apply Msharpen and IT only accepts YUV or RGB32! Im screwed. There is no way to apply the filters I want without MULTIPLE colorspace conversions. The real killer is that Msmooth does not accept YUV and/or that Decimate does not accept RGB32. What other options are available to me? I would prefer to stay entirely in RGB32, but will accept ONE conversion to YUV if necessary. Thanks.

I would suggest that you look into other filters that all work in the same colorspace. Check the FAQ at and you'll find more links to filters than you ever wanted to see. In your case it would seem like the best option to find a sharpener that supports YV12 (asharp is the only one I've personally used, but there are several others that you'll find in the FAQ).

Well the trouble is that some filters are a real hassle or nearly impossible to code in some colorspaces. Iirc correctly Donald said something like this about his Decomb stuff in RGB.

Ok fine, Decomb can output to YUV. I am willing to make one conversion. But since Decomb is most likely going to be the FIRST filter applied, you'd think all his other filters would accept Decombs output natively, without ANOTHER conversion being necessary.