HDbase-T and Video Over IP solutions were invented in the era of high definition video (HD). HD bandwidth requirements are low enough that these solutions work without significant user experience trade-offs. With 4K video, the bandwidth requirements exceed the capabilities of copper networking cables. In order to offer 4K video, feature trade-offs such as lower frame rates, reduced color palate, and/or HDR limitations are required by HDbase-T and Video Over IP solutions.
One of the primary tools used by HDbase-T and Video Over IP solutions is compression. Compression attempts to squeeze the size of data (video stream) in order to reduce the bandwidth required to send that data from point A to point B. In theory, there exists a type of compression called "lossless" compression. This means that no data is lost when compressing and decompressing. However, processing requires time which affects the user experience in the form of latency.
Most compression used by HDbase-T and Video Over IP is not "lossless". This means visual data typically colors are permanently lost during the process of compression and decompression. Clever marketers coined the term "visually lossless" to explain this data loss as something that most people would not notice.
There is a difference between compressed and uncompressed 4K video that most people can see. The best way to determine the truth is to see for yourself in a side-by-side comparison. Ask your integrator or visit a showroom to see what compression is really costing you.
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.
Video over IP is a satisfactory solution for deploying 1080p, but 4K video exceeds the limits of copper transmission technology. 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.