HDR Video is it the same as 10bpc? - Page 1
Forum section: electronics / general

author: Howardlong
author_rank: Super Contributor
timestamp: June 08, 2017, 12:35:03 pm
content: FolksHere's a nerd question for the HTPC guys.I have a mobo (Asrock Z270 Fatal1ty ITX/ac populated with an i7-7700k) that says it'll do up to 12bpc through the integrated graphic's HDMI 2.0b port. There is an FAQ item on setting it up for UHD BluRay which is my application, but I can't get the compatibility app to show it's HDR compatible.My monitor (Philips BDM3275UP) is HDMI 2.0b compliant and supports 10bpc when connected to a GTX1080, but I don't get this option when connected to the integrated graphics via the HDMI 2.0 port.I can play UHD BluRays at 4K (UHD) resolution, but I get a warning it's not HDR (as expected from the compatibility report) so you get visible banding in certain scenes.So, is 10bpc synonymous with HDR or am I misunderstanding something?

author: NiHaoMike
author_rank: Super Contributor
timestamp: June 08, 2017, 04:19:15 pm
content: HDR10 is 10 bits/color. Dolby Vision is 12 bits/color and has stricter standards to comply.

author: mariush
author_rank: Super Contributor
timestamp: June 08, 2017, 04:29:19 pm
content: I would say it's "at least" 10 bits.Right now HDR is a mess, a few competing standards. Just 10bpc doesn't make a video HDR, the video itself has to be encoded using another color space (bt.2020 instead of bt.709) and should be encoded accounting for the much higher range of brightness (for ex up to 1000 nits , while regular TVs and monitors have only up to 300-500nits)

author: RGB255_0_0
author_rank: Frequent Contributor
timestamp: June 08, 2017, 05:43:42 pm
content: HDR10 is 10bit but 10bit isn't HDR. Your monitor doesn't support HDR - likely limited by the brightness requirements.

author: Howardlong
author_rank: Super Contributor
timestamp: June 08, 2017, 06:08:20 pm
content: Quote from: RGB255_0_0 on June 08, 2017, 05:43:42 pmGlorious comfusion! So the monitor supports 1.07bn colours, i.e., 2^30, or 10 bits each of R, G, B.But that is not HDR10.So, what is the difference between HDR10 and 10bpc, and how does the source know? Is there some meta information in the EDID or something?

author: Howardlong
author_rank: Super Contributor
timestamp: June 08, 2017, 06:12:43 pm
content: Quote from: mariush on June 08, 2017, 04:29:19 pmAh OK, well I guess the consumer's shafted again then. The requirements for DRM'd UHD content, and especially UHD BluRay, is hard enough as it is without adding a further complication of needing to upgrade the monitor which I *assumed* at 10bpc was HDR.

author: RGB255_0_0
author_rank: Frequent Contributor
timestamp: June 08, 2017, 06:44:24 pm
content: Quote from: Howardlong on June 08, 2017, 06:08:20 pmThere is some data transported along with the HDMI signal:http://www.hdmi.org/manufacturer/hdmi_2_0/hdmi_2_0a_faq.aspxHDR is an absolute mess right now. Some stuff looks great, some stuff looks terrible. All down to the colourist, which makes it entirely subjective.

author: mariush
author_rank: Super Contributor
timestamp: June 08, 2017, 06:50:12 pm
content: Yeah.If you're curious, i have some test videos here :LINKIf you have a HDR TV, you may see a difference if you play them from a usb stick or from network, between tv and monitor when it comes to colors.Also note that your video player may ignore by default the fact that your monitor can do 10bpc ... it may actually decode the video but then convert it from 10 bits per color to 8 bits per color because that's more compatible and easier to work with. Or, it may only be able to do 10bpc in full screen mode (pretend it's a video game and reserve the whole monitor for rendering at 10bpc)If you have your desktop configured at 10bpc, you must go in your preferred movie player and make sure it renders the video on a 10bpc "surface" and doesn't just take it down to 8bpc.InMedia Player Classic Home Cinemayou can simply press Ctrl+J to see how the video is rendered.I'd suggest downloadingLife_of_ Pi_draft_Ultra-HD_HDR.mp4(~300 MB) and if you want,Sony_4K_HDR_Camp.mp4(~ 1.1 GB)Life of Pi is 4K 24fps :VideoID : 1Format : HEVCFormat/Info : High Efficiency Video CodingFormat profile : Main 10@L5.1@HighCodec ID : hev1Codec ID/Info : High Efficiency Video CodingDuration : 54 s 375 msBit rate : 44.8 Mb/sWidth : 3 840 pixelsHeight : 2 160 pixelsDisplay aspect ratio : 16:9Frame rate mode : ConstantFrame rate : 24.000 FPSOriginal frame rate : 23.976 (24000/1001) FPSColor space : YUVChroma subsampling : 4:2:0 (Type 2)Bit depth :10 bitsBits/(Pixel*Frame) : 0.225Stream size : 290 MiB (99%)Writing library : ATEME Titan KFE 3.7.0 (4.7.0.2002)Color range : LimitedColor primaries :BT.2020Transfer characteristics :SMPTE ST 2084Matrix coefficients : BT.2020 non-constantMastering display color primar :R: x=0.680000 y=0.320000, G: x=0.265000 y=0.690000, B: x=0.150000 y=0.060000, White point: x=0.312700 y=0.329000Mastering display luminance :min: 0.0200 cd/m2, max: 1200.0000 cd/m2Sony video is 4K at 60fps :VideoID : 1Format : HEVCFormat/Info : High Efficiency Video CodingFormat profile : Main 10@L5.1@HighCodec ID : hvc1Codec ID/Info : High Efficiency Video CodingDuration : 2 min 7 sBit rate : 75.6 Mb/sMaximum bit rate : 123 Mb/sWidth : 3 840 pixelsHeight : 2 160 pixelsDisplay aspect ratio : 16:9Frame rate mode : ConstantFrame rate : 59.940 (60000/1001) FPSColor space : YUVChroma subsampling : 4:2:0 (Type 2)Bit depth :10 bitsBits/(Pixel*Frame) : 0.152Stream size : 1.12 GiB (100%)Encoded date : UTC 2016-02-03 07:59:49Tagged date : UTC 2016-02-03 08:01:32Color range : LimitedColor primaries :BT.2020Transfer characteristics :SMPTE ST 2084Matrix coefficients :BT.2020 non-constantMastering display color primar :R: x=1.000000 y=1.000000, G: x=1.000000 y=1.000000, B: x=1.000000 y=1.000000, White point: x=1.000000 y=1.000000Mastering display luminance :min: 0.1000 cd/m2, max: 0.5000 cd/m2