I got the GT. If you remember, one of the things I wanted to look at was CPU utilization. On my P4-2.4ghz w/ Nvidia 6800 and the OnAir viewer set to hardware decoding and Overlay, I get processor utilization in the 40-50% range. The most efficient setting I can get from BeyondTV4.4 is 80-90%. The only way to get the Hardware decoding set to -on- in BTV4 is to turn on 3d instead of Overlay.
With both the OnAir viewer and BTV, when I have 3d rendering turned on instead overlay, I get a superior picture but processor utilization reaches 100% for extended periods, so I get stuttering. I would be interested to hear an explanation from anyone as to why 3d rendering takes so much more processing than overlay. BTW, I am viewing this at 1080p. I am guessing it's better because the 3d rendering is actually improving the picture beyond source-quality in the same way ffdshow might. But I tried turning off those nvidia enhancements and still had an overloaded processor.
When I am not viewing HD content, my processor can ~just barely~ handle 3d rendering. I have to say, I am deeply impressed with how much the picture gets improved by the 3d engine. My first product suggestion is to put in an option to use 3d rendering when the content is not HD. I guess there are some stations that would broadcast their non-HD source-content in HD, upconverting on their end. I guess it wouldn't be any easier for a processor to handle that vs. True HD-source-broadcasts. Alternatively, if we could configure per-station preference for using 3d or overlay would help. Some substations always broadcast non-HD.
Originally Posted by rpertusio
Often each channel will broadcast different aspect ratios throughout the day. (For instance... 1920x1080 during Primetime, and 720x480 during the evening news.) I would like some feedback from other members here to see if this is a must have feature.
Ryan, In this quote you were referring to a suggestion for station-specific ration selection, but I think it's relevant here, too. I'd like to second this suggestion for improving ratios, but maybe refine it a little bit. It seems that the OnAir viewer is automatically stretching everything (without preserving aspect ratio) to fit the fullscreen view. The stuff that's still showing left-and-right horiz bars I think has been upscaled by the broadcaster. Is there a way to disable that so that it displays the original size... or better yet zooms to fill vertical but preserves aspect ratio? That might eliminate the concern about per-channel ratios. It would for me.
If not... relating to per-channel settings, for me, I'd be referring to per-subchannel settings. Your statement about the different broadcast formats isn't true for the subchannels; not in my area, anyway. The subchannels are almost never broadcasting anything in high-def. My local Fox affiliate broadcasts TheTube (music videos) in like 320x240. So automatic zoom to fill the vertical would be perfect for that. And if I could run *that* through the 3d renderer instead of overlay, it would look great and my processor could handle it.
By the way, I bought the VBOX USB tuner first, but wasn't happy with BTV's processor utilization and some other things related to how BTV hogs my system. So I decided (between DVICO and OnAir) to go with OnAir GT after re-reading this thread to see how few people were having troubles and how responsive Ryan is to inquiries, help requests, and suggestions.