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The High-Definition Multimedia Interface 2.1 specification has been released. The total transmission bandwidth has been increased to 48 Gb/s from the 18 Gb/s of HDMI 2.0 (or a maximum data rate of 42.6̅ Gb/s from 14.4 Gb/s). The new data rate is effectively tripled to 128 Gb/s when using Display Stream Compression (DSC).
Using DSC, HDMI 2.1 cables can transmit 4K (3840×2160) @ 240 Hz, and 8K (7680×4320) as well as UW10K (10240×4320) at 120 Hz. Without DSC, you will be able to transmit 4K @ 120 Hz, 5K (5120×2880) @ 120 Hz, 8K @ 60 Hz, and UW10K @ 30 Hz. Keep in mind that color depth and chroma subsampling also affect the necessary data rate.
The specification also adds new features such as dynamic high-dynamic-range support (you read that right - the first "dynamic" refers to "dynamic metadata that allows for changes on a scene-by-scene or frame-by-frame basis"), Variable Refresh Rate, Quick Frame Transport, Quick Media Switching, and Auto Low-Latency Mode:
This new version of the HDMI specification also introduces an enhanced refresh rate that gamers will appreciate. VRR, or Variable Refresh Rate, reduces, or in some cases eliminates, lag for smoother gameplay, while Quick Frame Transport (QFT) reduces latency. Quick Media Switching, or QMS, reduces the amount of blank-screen wait time while switching media. HDMI 2.1 also includes Auto Low Latency Mode (ALLM), which automatically sets the ideal latency for the smoothest viewing experience.
- Here is the HDMI Forum's PPT PDF explaining HDMI 2.1.
- Here are the data rates and cables required for various resolutions/bit depths/chroma. Resolutions requiring Display Stream Compression are indicated.
- Here is another table showing the various color depths and chroma subsampling levels.
Also at the HDMI Forum, AnandTech, Tom's Hardware, and The Verge.
Previously: HDMI 2.1 Announced
(Score: 5, Interesting) by jmorris on Thursday November 30 2017, @05:01AM
Yea ordering can matter. And it sometimes takes a long time for all of the DRM to lock in. I put in a BD movie and it blanks several times as the menu is coming up. Hit play and it goes through the cycle again, lights blinking on the amp, the TV blinking the new connection notification, etc. It isn't mode switching since I locked the player to always output 1080p60 and it still does it. It is wretched. And it is utterly pointless since I have an HDCP stripping HDMI splitter I could put in that line if I wanted to have to buy another one for the place where it is now. HDCP is totally broken. Of course with UHD and HDMI 2.1 they will be trying again. Once more, with feeling!
Then there is the BS where I put a music disc in the BD player, turn on the amp and it, no matter what I disable, insists on finding a way to force the TV to power up. Wanna bet the player is wanting to negotiate HDCP or some such bull crap reason?