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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: 4, Funny) by Anonymous Coward on Thursday November 30 2017, @04:52AM
Video used to be much simpler when it was analogue. It was all SECAM, PAL, NTSC or 576i.
If it was SECAM, it was D-SECAM, MESECAM or French SECAM, depending on where you were.
If it was PAL, it was PAL-M, which was like NTSC; PAL-N, which was like NTSC and like PAL-M; PAL-I; PAL-B/G or PAL-60, another one that is like NTSC.
And if it was NTSC, it was always NTSC-M, except when it was NTSC-J; NTSC-N, also known as NTSC50; PAL-M, which was like PAL but also like NTSC; or PAL-N, which was also like both PAL and NTSC.