14.02.2022 | Ausgabe 1-2/2022

H.266 To The Rescue As Mobile (UHD Video) Traffi:c And Bandwidth Demands Continue To Grow Worldwide

Michael Grotticelli is an experienced editor
and regular contributor to FKT’s Tech Across
America column. // Image: Michael Grotticelli

Michael Grotticelli is an experienced editor and regular contributor to FKT’s Tech Across America column. // Image: Michael Grotticelli

TThe latest video codec, called the Versatile Video Codec (VVC or H.266), is promising to help stream content much faster and with less bandwidth than its predecessors. For consumers, video compression makes it easier to transfer these files over the internet without burning through data limits in a few minutes, and ensures smooth playback with minimal buffering. For example, a seven-minute 1080p video could roughly burn 200–600 MB of your data, depending upon the codec used.

These performance gains come at an opportune moment, as the centrality of efficient video encoding in modern life grows ever more apparent. A study by Ericsson released last year forecasts that, even as total mobile traffic worldwide is set to quadruple by 2026, the proportion of that traffic for which video accounts will grow from 66 % to 77 %, assuming that the industry employs efficient compression technology.

Some of the standards currently used across the web for video streaming are AV1, H.264, like H.265/HEVC (High-Efficiency Video Coded), VC-1, and Apple ProRes. Like VVC, most of these use a mathematical concept called Discrete Cosine Transform (DCT) that identifies redundant pixels in an image that could be that can be discarded while compressing it, without significantly affecting image quality.

Now we have VVC, which was developed by the Joint Experts Team (JVET) of the Telecommunication Standardization Sector (ITU-T) – specifically the study group 16, which began their work in the fall of 2017 and completed the final standard in July 2020. The team was formed by experts from the Moving Picture Experts Group (MPEG), the ISO/IEC group and the Video Coding Experts Group (VCEG) – part of the ITU-T group.

Fraunhofer Heinrich Hertz Institute, based in Germany, was one of the developers of the standard. Benjamin Bross, the head of the video coding systems group at Fraunhofer HHI, said that a more efficient codec became necessary as more phones and devices now support 4K image capture, file delivery and storage. When the standard was released, Fraunhofer HHI said that the HEVC standard takes up 10 GB of data to stream a 90-minute long 4K video file. In comparison, H.266 uses only 5 GB of data to stream the same file. Other members of the JVET include Apple, IBM, Huawei, and Nokia.

Bross said that along with the increase in video quality, data consumption is also increasing, and current broadband bandwidth is not able to keep. The idea then was to develop a codec that was 50 % more efficient than the current state-ofthe-art AVC.

So, what’s the advantage of H.266? The primary goal for any new video compression standard is to reduce the bandwidth a video takes up while preserving the fidelity as much as possible. Early tests suggest that H.266 achieves 40 %–50 % better compression rates than HEVC, which is currently used by Apple in iPhones. That could mean that you can stream an episode of your favorite series by using almost half the data.

The JVET decided to develop VVC for applications beyond video streaming. The standard has support for distributing 4K to 8K videos seamlessly, along with support for 360-degree videos. This could be useful in VR and AR applications. The new codec is designed in such a way that that users can access different regions of a frame directly in the bitstream. So a video streaming service could choose to stream regions of a scene that aren’t very important (or are redundant, like a talking head) in the scene in a lower resolution to save bandwidth.

Currently, India-based streaming platform MX Player is one of the few platforms of the world that has already adopted the H.266 standard to stream its content. Siddharth Mantri, chief product officer at MX Player, told news outlets that while the cost of mobile data has gone down in India, there are still bandwidth limitations that could throttle the quality of videos. He confirmed that the new standard offers the most advanced video compression standard available in the world, and reduces data usage by more than 50 %.

While MX Player prefers to compress and stream its content with H.266, depending on the device and network conditions, it might have to fall back to other standards such as AV1 or H.265 on some devices, until playback support for the new standard is included in processing chips used in playback devices. Other streaming players will also face this challenge and have to follow suit for a while. Mantri said that the company has been processing and sending content using the H.266 standard for about 20 % of its customer base and it has received no complaints.

While both the encoder and decoder are opensourced, it’s hard to develop them both for all companies. MX Player has built its own encoder, and has licensed the decoder from Tencent, one of its investors.

Licensing companies like MPEG-LA and Access Advance are working on usage licenses for H.266, with a pool of licenses from different right holders and developers.

Efficient video compression is critical in many respects to ongoing economic advancement worldwide. The bulk of video currently transmitted over the internet is encoded using the AVC codec (finalized in 2003), and we are approaching the upper limits technologically of what that codec can provide. VVC is poised to meet industry demands for video compression going forward.

Of course, while H.266 looks like an efficient and flexible standard on paper, it’ll take years for it to dethrone current standards such as H.265 and AV1. While HEVC was released in 2013, it was supported in iPhones only by 2017. Therefore we might see support for H.266 in chipsets by the middle/end of this year, and wider support in devices should follow soon after.


 

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