The retro gaming community would be eternally grateful if we could come up with a single IC that can take RGB + Composite Sync signals and convert them to YPbPr. Older game console output 240p until the Nintendo 64, which could output 480i or 240p. Ideally the chip could accept either signal and output them as YPbPr without any other changes.
I know this chip must exist, as the video encoder used on older Super Nintendos does this. Although the YPbPr is outputted it is not intended to be displayed, and does not have correct Pb and Pr signals (colors are washed out a little). If they had a chip that did it in 1991 there must be a chip that is available now that does it. We're not exactly keen on cannibalizing SNESes for this purpose. The older video encoders in SNESes that could do this are Rohm's BA6591AF and BA6592F as found in datasheet:
http://mikejmoffitt.com/BA6592F.pdf
Sorry that datasheet is in Japanese.
Would really love an American TI part that could do this job!