Join Date: Apr 2007
Location: Calgary, Shaw Cable
An HD DVD player outputting 1080i vs 1080p SHOULD look the same if the TV does proper 1080i inverse telecine. If it looks worse, the TV is not deinterlacing the 1080i properly.
The thing about 1080i60 is that it actually gives you the best of a few worlds. Right now I think most 1080p implementations are 24fps and 30fps. Until there are mainstream 1080p60 implementations, 1080i60 still has much use. For example, it can encode 1080p24 just fine using a 3:2 cadence and inverse telecine will give you 1080p24 at the other end. It can also encode 1080p30 at a 2:2 cadence and assuming a proper deinterlacer (that can detect it should be able to weave) you will get 1080p30 displayed. The last choice would be true 1080i60 and with a proper deinterlacer, some parts will be bobed and some parts will be weaved, giving anywhere from 1080p30 to 540p60 resolution depending on what is in the scene. Stills or near stills should have full spacial resolution and motion should have full temporal resolution. In short, with good deinterlacers, I don't think 1080p will matter until 1080p60. If we ever hit that!
1080i60 is really the only way to handle all of that. 1080p24 can't encode 30fps sources and 1080p30 can't encode 24fps sources. 1080i60 can do it all right now. So could 1080p60, but the bandwidth requirements would double.
1080p progressive displays are definitely relevant in all this, but I am not sure 1080p transmissions matter unless they are going to be 60fps.
Please correct me if I am wrong because this is my understanding.
120hz as has been pointed out is indeed a benefit if it does 24fps sources using a 5:5 pattern, and also if it uses interpolation or dark frames to improve motion.