Taken from Etremetech
Video and the TX-SR875
The Onkyo SR875 has a Silicon Optix Reon video processor built in, which does an excellent job of upscaling standard-definition video. We used Silicon Optix's own HQV DVD video quality test, piping the video in native 480i format through a Yamaha DVD-S2300.
The Onkyo allows you to scale any input to 1080p and pipe it out the HDMI monitor output. As expected, the Onkyo unit scored a solid 120 (out of a possible 130), with only minor issues visible in the HQV noise reduction tests. (We did our best to set the Sony HDTV to do no processing, including disabling noise reduction and edge enhancement.)
The same can't be said for the DVD upscaling from either the Sony BDP-S300 or Toshiba HD-A20 players. Neither scored better than 80 on the HQV test, and the BDP-S300 couldn't pass the racetrack 3:2 pulldown testpretty disappointing for a $500 product.
Part of the problem with both players is that they output only at one resolution over HDMI. If you set them for 1080p (or 1080p/Auto in the case of the Sony), then they upscale DVD content using their own internal video processors. The Onkyo's Reon processor can't help in those cases. For that reason alone, you might want to keep your older DVD player around, set it to 480i, and let the Onkyo do the upscaling and de-interlacing.
I should note that, HQV tests aside, most actual DVD content looked pretty good on both players. Though the Sony flunked the HQV 3:2 pulldown test, a number of DVDs subjectively looked better to our eyes than the Toshiba HD-DVD unit.
For that reason alone, you might want to keep your older DVD player around, set it to 480i, and let the Onkyo do the upscaling and de-interlacing.
hmm that means you have to send in native resolution for the Reon processor to work.
We still dont know if the Yamaha DVD-S2300 is connected through HDMI!!!!!