Compression Compromise

Friends don't let friends compress video

The Compression Compromise: HDBaseT and Video Over IP Tradeoffs

Compression wasn’t much of an issue until HDR came along because the bandwidths still fit within the 10G limit supported by HDBaseT, SDVoE, and Video over IP, but that’s changing as more and more HDR content becomes available, and compression is resulting in compromises that are readily visible.

Compression is image or video processing done to reduce the file size often resulting in a tradeoff between picture quality and data. It has become a key component for 4K video with the transition of HDR and higher frame rate content because some links between the source and the display just cannot support the full bandwidth.

Compression of real time video uses lossy compression techniques because they provide large compression ratios and allow for fast processing. However, this is done at the expense of throwing away data deemed to be less important assuming that in most cases the viewer won't notice the difference - often coined "visually lossless compression." This lossy compression takes great video content and degrades it using methods such as lowering the frame rate causing blurring, reducing HDR's 1.1 billion colors to the standard 8-bit color with only 16.8 million colors causing banding artifacts, or full color/intensity 4:4:4 chroma to 4:2:0 chroma-subsampling.

The good news is that there is no need to compromise! The Real4K HDMI Optical Adapters and Extenders support the full 18 Gpbs video, completely uncompressed and all transmitted over a single optical fiber. The compression compromise is simply unnecessary. Ask your integrator or visit a showroom to see what compression is really costing you with a side-by-side comparison.

 

 

Common Tricks Used by “Faux K” Solutions

 

Reducing the maximum allowable frame rate from 60fps (60Hz), which can create motion artifacts.

Limiting the 4:4:4 color schema to a subsampled 4:2:0, which throws away half of the image data.

Losing high dynamic range (HDR), which takes away the deep contrast that makes current display technology so incredible.

Compressing the 4K signal, which throws away signal data and can create latency issues.

Making Video Over IP Work

Video over IP is a satisfactory solution for deploying 1080p, but 4K video exceeds the limits of copper transmission technology over any meaningful distance. The concept at its core is not a bad idea, but in order to implement 4K Video over IP without performance trade-offs, solutions would need a much faster, fiber optic IT infrastructure. Data networking solutions using fiber have specific data rates that go from 1G to 10G to 40G. These data rates are not the same data rates that are used in video transmission (18G, 24G, 48G). In order for Video Over IP solution to deliver uncompressed 4K video, they would need a very expensive 40G IT infrastructure, and this would not even be sufficient for uncompressed 8K in the near future.

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