Originally Posted by conan48
4K 3D is supported, but only at 24hz
Forget about the Hobbit or any other movies shot at 48fps or possibly 60fps in the future (Avatar sequels)
I'm hoping the HDMI 2.0 spec. and the upcoming Blu-ray update will, in addition to the 4K related capabilities, also add support for 1080p 3D at up to 60Hz. That would at least offer the choice of viewing high frame rate movies in either 4K @ 24Hz or 1080p @ up to 60Hz. It's my understanding that The Hobbit for the HFR presentations was shown in theaters at 4K @ 48Hz for 2D but for 3D it was at 2K resolution.
Since HDMI 2.0 supports up to 18 Gbps let's do a little math to see how much 4K requires:
First remember that HDMI video information that has already been decoded that can be bit-for-bit displayed. In the worst case (i.e., with sRGB format or YCbCr with 4:4:4 chroma subsampling), when we talk about 8-bit color depth that is 24 bits total per pixel to convey the full color information. Likewise for 10-bit color depth that is actually 30 bits per pixel and for 12-bit color depth that is actually 36 bits per pixel.
For 4K resolution (actually 3840 x 2160 pixels) video at 60Hz the worst case data rate required to just convey the bit mapped image information (not including any data headers, digital audio, or anything else) is:
8-bit color depth:
3840x2160x24x60 = 11.044 Gbps
10-bit color depth:
3840x2160x30x60 = 14.930Gbps
12-bit color depth
3840x2160x36x60 = 17.916Gbps
So as you can see 4K can be very demanding in terms of bandwidth when you are using a 60Hz refresh. At 30Hz all of the above total Gbps would be cut by 50% and at 24Hz these number would be reduced by 60%. Also using other than 4:4:4 chroma subsampling will reduce the data rate at the expense of chroma (i.e., color) resolution.
I still have not seen specific details as to what bit depths and chroma subsampling types HDMI 2.0 supports at 4K resolution when operating at 24Hz, 30Hz, 48Hz, 50Hz, and 60 Hz
.Edited by Ron Jones - 9/15/13 at 12:25pm