Hi,
- most important, my amp (Yamaha AX1) is capable of switching YUV input
signals (and add his OSD to it), but can't do RGB
no, the AX1 don't have a OSD via YUV (only with FBAS und Y/C).
That's *the* real reason... if you have more than one YUV device (VDR + something else) *or* you really need the OSD from the amp. My amp only switch S-Video, and does not add OSD, and it would not be a problem for me to directly connect the VGA output from the VDR to the display device, since the VDR is in fact the only valuable video device (VCR does not count as "valuable" : composite only, mono audio, etc.).
So the highest achievable quality for me is YUV
I googled for YUV + Matrox + DirectFB, but can't find anything else than overlay specifications : nothing about output signal type.
I'll think that Ati is the better choice, if you want YUV ... Greetings burki