Originally Posted by Johnla
Actually I think it just proves that the scaler functions of this AVR, and others like it. Are not anywhere near as 'high end', as many people were thinking/hoping that they would be.
When set to 720p output mode, the Onkyo 875/905 deinterlace 1080i channels to 1080p, and then rescale that 1080p output to 720p.
Onkyo evidently decided it was best not to mess with 1080p24 and 1080p60 inputs, and just pass those signals as is, regardless of the output mode selected on the AVR. There is justification for doing it that way. Suppose, for example, you had a 768p display like a 2006 Panasonic PX60/PX600 plasma. In that case, you'd want to output Blu-ray and HD-DVD as 1080p to the Panasonic, but SD might be preferable to output at 720p. Of course, you might trade off some quality with 1080i channels by outputting at 720p rather than 1080p to that Panasonic 768p display.
As a practical matter, I don't think the lack of processing for 1080p inputs matters as much as some members suggest. The Sigma Designs decoder found in most Blu-ray players does excellent 1080p->720p scaling -- comparable to most modern video processors. I can't think of any scenario where you'd need to scale a 1080p signal to 720p in a VP. I know some first-generation HD-DVD players with the Broadcom BCM7411 decoder didn't produce particularly good 720p output, but those products didn't offer 1080p output anyway, so you'd just output 1080i to the AVR, which would deinterlace it to 1080p and then rescale it to 720p for output.
On a dedicated $2000-$3000 video processor, you would expect options to customize every aspect of the output for every input, but I think it has become clear at this point that Onkyo decided to provide the bare minimum of configuration options, probably to reduce both user and design complexity in a mass market product. That is not altogether surprising, but it is disappointing, as many (including myself) were hoping Onkyo might provide options comparable to the Toshiba HD-XA2. Perhaps Denon will provide such options with its AVR-5308ci to help justify its price premium.