If all RGB decompression options are off but fast recompress sends RGB24 to XVID that definitely means, that the compressed material is RGB, not YUY2, I cannot see any other way. Or there is a bug somewhere.
Can you send me a few frames of the compressed material which is sent as RGB24 to XVID/other codecs?
I don't panic, but there may be either a bug or setup problem here, and if it's a bug, it definitely needs to be hunted down.
Thanks in advance, and sorry for taking your time!
EDIT: Thanks for the comments about 10 bit. Actually it's already well past the point of a wish to do it, but don't want to announce anything yet :)
Greets,
I.