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TECH BLOG / September 20, 2019

8K Playback with 12G SDI Interface



By Mauricio Alvarez-Mesa, PhD

Spin Player is a software media player that allows to play very high resolution video including 4K, 8K, and 16K using standard PC systems. The Player is based on Spin Digital high-performance HEVC/H.265 decoder and Spin Digital optimized video rendering engine.

An important component of the video playback chain is the output interface. Spin Digital currently supports video rendering with GPUs that include up to 4 DisplayPort outputs which can be combined to form a single 8K frame.

More information about the recommended systems for 8K playback using GPUs can be found in a previous edition of our tech blog

https://spin-digital.com/tech-blog/recommended-systems-8k-playback/

With GPUs, however, it is not always possible to have a full control of the video output as the device can perform automatic color conversions. In addition, HDR formats are not properly  supported when using multiple DisplayPort outputs as in the case of 8K playback.

Spin Player now supports 12G SDI output for 8K HEVC video playback. The SDI support is addressed for professionals requiring maximum control of the video processing and display chain. In this tech blog we describe the use cases, requirements and systems needed for 8K playback using SDI interfaces

12G SDI for 8Kp60, 8Kp120, and Beyond

12G SDI offers the bandwidth required for the transmission of uncompressed 8K (7680x4320px) video at 60 Hz with 4:2:2 10-bit format, by using a quad-link 2SI 12G configuration as specified in the SMPTE ST 2082-12 standard.

For 8Kp60 the 12G interface requires a single SDI board and only 4 12G SDI cables as opposed to two devices and 16 cables as with 3G SDI

12G SDI can also be used for 8Kp120 playback for High Frame Rates (HFR) or 8K 3D (stereoscopic) applications by using two 12G SDI boards. Spin Player already supports this feature called multi-device, which allows to combine several output devices to create a single output. This feature supports different operation modes including: clone (same output in all devices), tiled (single video frame across multiple devices), and alternate (interleaved output among devices).

By using multiple 12G SDI cards it is also possible to support resolutions beyond 8K including 16Kp60 for very-large scale visualization systems.

System Configuration for 8K Playback with 12G SDI

For 12G SDI playback Spin Digital recommends the AJA 12G Kona 5 board. The Kona5 board allows to play 8K video using a single device (1 board with 4 12G SDI links).

https://www.aja.com/news/user-stories/566

8K HEVC Media Player with 12G SDI at IBC 2019. Spin Player is connected to the Sharp 8K TV through four AJA Kona 5 convertors.

When using SDI as output interface, the video rendering process (color conversion, pixel format conversion, chroma subsampling, etc) is performed on the CPU. Spin Digital has developed an optimized library of video processing filters called SpinFilter for CPU video processing and rendering. Spin Player selects and configures automatically this optimized CPU rendering library.

FormatRecommended BitratePlatform
8Kp60
4:2:2
10-bit
200 - 250 Mbps- CPU:
Server: Intel Xeon Platinum 8260 (24 cores), or
Workstation: Intel Xeon W-3265 (24 cores)
- Memory: 48 GB (6x 8GB, DDR4-2933)
- SDI: 1x AJA Kona 5
- OS: Windows 10 64-bit
8Kp60
4:2:2
10-bit
*Post-processsing
200 - 250 Mbps- CPU: 2x Intel Xeon Gold 6240 (2x18 cores)
- Memory: 192 GB (12x 16GB, DDR4-2933)
- SDI: 1x AJA Kona 5
- OS: Windows 10 64-bit
8Kp120
4:2:0
10-bit
*Post-processing
200 - 250 Mbps- CPU: 2x Intel Xeon Platinum 8260 (2x24 cores)
- Memory: 192 GB (12x 16GB, DDR4-2933)
- SDI: 2x AJA Kona 5
- OS: Windows 10 64-bit

*Post-processing: when adding post-processing video filters such as color conversion (color gamut conversion) and tone mapping (HDR to SDR conversion) the video renderer requires more computing performance. This translates into more CPU cores for the cases when color gamut conversion or tone mapping are needed.

Display Systems for 8Kp60

Spin Player with 12G SDI output can be used for 8K playback on 8K TVs (using SDI to HDMI conversion) or 8K projectors that accept 12G SDI directly.

8K TV with HDMI Input

Display system for 8Kp60 using Spin Player with 12G SDI and an 8K TV with HDMI 2.0

Some 8K TV models accept 4x HDMI 2.0 inputs. A player with SDI interface can be used in combination with 4x 12G SDI to HDMI converters that can be acquired commercially from different vendors including AJA or Black Magic.

8K Projector with SDI Input

Display system for 8Kp60 using Spin Player with 12G SDI and an 8K Video Projector

Some recent projectors support 8K resolution and accepts directly 12G SDI as input interface. Spin Digital presented in May 2019 a demonstration of 8K playback at the Festival de Cannes using Spin Player with 12G SDI and the Insight laser 8K projector from Digital Projection.

Note and Disclaimer

These recommendations are based on internal tests performed by Spin Digital. This information is provided “as is” and it does not imply any warranty or assurance. If you have more specific requirements, please contact us.

Spin Digital and Spin Player are a trademarks of Spin Digital Video Technologies GmbH.

Other trademarks remain the property of their owners, and are used here for descriptive purposes.

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