What are the features of the HDMI 2.1?

As a new interface standard, HDMI 2.1 can optionally support the following new features:

HDMI 2.1 complies with a new interface standard and supports the following new features:

1. The appearance and specifications of the port are the same as the current HDMI port.
2. Higher requirements for data line performance and anti-interference ability.
3. The bandwidth is increased to 48 Gbps, which is 2.67 times from HDMI 2.0 (18 Gbps) (optional support)
4. Carry up to 10K@120fps video signal (optional support)
5. New audio and video features: dynamic HDR, enhanced audio return channel eARC (optional support)
6. New game features: variable refresh rate VRR, fast frame transfer QFT, automatic low latency mode ALLM, fast media switching (optional support)
7. New video signal compression format: VEAS DSC 1.2a (optional support)

Note that because the above new features are not mandatory support, it is not necessary for the device to support HDMI 2.1port to support the above features. The specific support of each feature needs to be based on the actual support of the device.

Explain:
Since the function items of HDMI2.0 are covered by HDMI2.1, the functions equivalent to HDMI2.0 are a subset of HDMI2.1, so some devices may only support the functions of HDMI2.0 and do not support any new features of HDMI2.1 , but it is also marked HDMI2.1;
So what needs to be understood is that HDMI2.1 is a name, and the new features are optional but not mandatory; and the function of HDMI2.0 is also a part of HDMI2.1, so it can be called HDMI2.1

And HDMI2.1a adds a new feature on the basis of HDMI2.1: Source-based tone mapping (source-based tone mapping), this function can better present the HDR picture effect, and the color display of the image is more accurate . This new feature, like the new feature of HDMI2.1, is optional but not required.

Description:
1. HDMI 2.0 supports a bandwidth capacity of 18 Gbps, while HDMI 2.1 supports a rate of 48 Gbps. The increase in bandwidth enables HDMI 2.1 to transmit more information, which also means that images transmitted through HDMI 2.1 support higher resolutions and higher frames. rate.
2. Both the output terminal and the port must support HDMI2.1, and the transmission wire also needs to support HDMI2.1 to experience HDMI2.1.