14 Jul 2019, 23:30
There is another factor. On the Samsung 8k demos, I have seen stores showing them at fullhd or ultra HD instead of 8k. Not only that, they are too compressed and look horrible. Bland surfaces with fuzzy borders. You need high quality sources to get the best benefits out of 8k. Even ultra bluray is too low bit rate for me. We are talking about prosumer compression rates or more. That's around 600mb/s h265 plus. At 300mb/s, it's low. So, some fancy encoding tricks needed for streaming, to give perceived value to 8k content. And h266/267/268/h269/h270, or the Redray codec). You can double, or quadruple, that datarate again for extra quality compared to original lossless cinema camera footage retaining the visual contrast range. 75mb/s+ quality streaming is a must in the mean time to get you to level theoretically at h268. H266 is around, and h267 I think I heard was being fast tracked. I forget if they were fast tracking h268, but that puts them at Bluray quality per pixel at h267, which is what the industry wants, which is like low end prosumer, instead of the much better high end prosumer with 4:2:2 12 bit. The redray codec was originally demonstrated at 7 or so mb/s years ago, and described as flawless or whatever, by cinema people who came to the release event. I called BS in that, that by the time you stream it and to get actual high quality, it would be at similar rates to what we now see. But, the 7 or so mb/s, probably equates to barely visually lossless, which equates to streaming 8k at under 30mb/s. It might have been 9 mb/s with sound data. We had a similar claim the previous decade for Adams platform over here, that when it caner to streaming fell off. That might had been more compression than red ray. As you use more extreme high compression techniques the file becomes more fragile for streaming, so extra data recovery options can come into play, packing it with a lot of non image data. My own simple codec design might out do red ray, at under 20mb/s for 8k, and the design I'm pursuing from the 1990's is aimed at lossless at a number of times more than red ray, but this would need a lot of data recovery options but aimed at getting a lossless 8k stereo image at the same data rate as the Red ray small data rate demo.
Last edited by Steve on 15 Jul 2019, 02:44, edited 1 time in total.