There is a thread on nvnews about the component out in Linux, but no real conclusions yay or nay. Someone here (Cory?) built his own, but I never did get all the details. Seemed pretty simple from what I remember.Ooops... I just re-read what I was accused of accomplishing. The circuit I built converterted RGBHV (i.e. VGA) at 480i frequencies to *composite* (and s-vid). It wasn't component.
The RGBHV->component is a much easier circuit, though. There are lots of instructions on the 'net for how to build a transcoder for that. The toughest part is figuring out which gain matrix is correct for RGB->YPbPr... there seem to be a few different ones floating about.
Also, one minor caveat that I think most people happily ignore is that component video is supposed to have bipolar sync signals. Unlike the TTL-like signals of RGBHV, component sync is supposed to be nominally zero, go negative for a bit, then posititive for a bit, then back to zero. It keeps the DC level of the sync signal zero so DC restoring circuits aren't necessary.
I don't recall any of the DIY transcoders doing that, but they seem to work all the same.
-Cory
************************************************************************* * Cory Papenfuss * * Electrical Engineering candidate Ph.D. graduate student * * Virginia Polytechnic Institute and State University * *************************************************************************
_______________________________________________ mythtv-users mailing list [email protected] http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
