What is HDMI 2.1? Everything you need to know
Posted on 19 December 2017

What is HDMI 2.1? Everything you need to know

19th December 2017 by Adam Smith from WhatHiFi


HDMI 2.1 will make it possible to pass through 8K and even 10K content with HDR. But how close are we to that super high-definition future?

Most people probably don’t give much thought to their HDMI cables. “If it ain’t broke, don’t fix it”, as the old adage goes. Your current cables, connecting your Blu-ray player to your television, projector or soundbar work perfectly well, and that’s all that matters, right?

But the HDMI Forum – the organisation that manages updates and information about cables – is already looking towards the future, with HDMI 2.1. This new standard has increased bandwidth, supports higher frame rates, and can carry not just 4K but up to 10K video from your source to your screen.

So while you won’t have to rip out your cables and rush down the shops for replacements before Christmas, you should be aware of what the future of television is aiming to bring…


What does HDMI 2.0 do?


For those that don’t know the specs of their current cables, let’s get up to speed. HDMI 2.0 came out in 2013, and its main party-piece was being able to pass 4K content at 60fps (frames per second) - that’s video of 3840 x 2160 resolution, refreshed 60 times per second.

That high frame-rate is best utilised by 4K video games that need to track lots of different objects like whizzing bullets or speedy enemies - most films are made in 24fps, and television programmes are 25fps (or 30fps for shows made in the USA).

A few years later a small update, HDMI 2.0a, made the link between televisions and players capable of carrying HDR (High Dynamic Range) images as well, with HDMI 2.0b coming soon afterwards with support for HLG (Hybrid Log Gamma). Until now, that’s been the top standard for most consumers.

What does HDMI 2.1 do?

 Essentially, HDMI 2.1 has the capability to double-down on what HDMI 2.0a can manage. 2.1-standard cables will be able to easily outstrip the 4K limit, sending a maximum of 10K content at 120fps down the pipe.

All those extra pixels – six times that of standard 4K video – require greater bandwidth to send the information across. HDMI 2.1 cables are up to the task, with an upper limit of 48Gbps (Gigabits per second) rather than 18Gbps.

HDMI 2.1 will also be able to support Dynamic HDR. This allows the television to adjust its picture based on frame-by-frame information in the manner Dolby Vision and HDR10+ operate. Since a dark landscape might have different contrast requirements than that of a brighter scene, the ability to make instant adjustments should mean your movies and TV shows look their best.

The new standard has a few more improvements too: it should reduce the amount of time it takes to go from a blank screen to your content.

And for game consoles and virtual reality headsets, HDMI 2.1’s Variable Refresh Rate and Quick Frame Transport features should result in a smoother experience.

Finally, HDMI 2.1 is also ready to support eARC – an update to the ARC (Audio Return Channel) connection which means that you can now send DTS:X and Dolby Atmos soundtracks from your TV to your audio system, helping you get greater audio excitement from compatible movies and shows.

Will I have to buy a new television?


                                                 Sharp's 70-inch 8K TV

Right now, you won’t. But you might have to in the future - it depends on what you’re looking to use HDMI 2.1 for. With regards to eARC, the HDMI Forum says it’s unclear whether your existing ARC connection will be able to work with it. That’s because it’s up to the manufacturers whether it will be available through a firmware update. We expect to hear more about this in due course.

In the FAQs on the Forum, it says “manufacturers can produce products that are compatible with both eARC and ARC. However, eARC is not defined to be backwards compatible with ARC”.

Likewise, it’s possible Dynamic HDR will be available via a firmware update, but it looks like that’s down to the manufacturers too. Right now, we’ll just have to wait and see. But we expect televisions manufactured in 2018 or 2019 to probably have HDMI 2.1 ports rather than HDMI 2.0.

We’re yet to see any company bring out the first commercially viable 8K television, so there’s no need to put off buying a new TV now because you’re waiting for something else down the line.

Will I have to buy new cables?


Yes, although there’s no need to just yet. You’ll have to wait for the relevant hardware and software to become available before the need to join it together becomes an issue.


When can we expect to see these updates?
The earliest we would expect to see news of more 8K televisions and eARC-supported audio equipment will be at the Consumer Electronics Show (CES) in Las Vegas next month.

We’ll be reporting from the show, so check back here in the New Year for all the latest news on HDMI 2.1 and more.


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