8K HDMI monitors for Teranex Mini 8K

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ShepSiegel

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8K HDMI monitors for Teranex Mini 8K

PostTue Jun 18, 2019 8:03 pm

We love that the Teranex Mini 8K can take four 12G SDI streams from a decklink card and make a 4320p60 raster. But we are confused about the four HDMI 2.0 outputs from the Teranex box. Are they 4:1 interleaved HDMI 2.0 streams or something else? We know it's early-days for 8K, but what consumer 8K monitors are known to work with the Mini 8K? We are looking at the Samsung Q900RB 8K sets - but its not clear that would work with the Mini 8K - as a single HDMI link would require the data rates of HDMI 2.1 . Hoping some from the Blackmagic dev and sales team can chime in with options. Thanks in advance. -Shep
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Jack Fairley

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Re: 8K HDMI monitors for Teranex Mini 8K

PostTue Jun 18, 2019 9:51 pm

Tech specs say quad link HDMI 2.0 output for 8K. I think that TV is using a single HDMI 2.1 connection for 8K.
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Andrew Kolakowski

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Re: 8K HDMI monitors for Teranex Mini 8K

PostWed Jun 19, 2019 9:19 am

If TV has HDMI 2.1 then there is tiny chance it will work with Teranex (over quad connection). Quad connection has to be implemented in TV and this is rather done on pro units, not consumer ones. Don't count on easy plug and play solutions for 8K (specially cheap ones).

This this doesn't seems to be even able to properly handle 8K. It has limited support for 8K (60p at 4:2:0 only), like 4K TVs had at the beginning (using old hacked HMDI chips):
https://www.forbes.com/sites/johnarcher ... 9d6ace2102
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Dave Del Vecchio

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Re: 8K HDMI monitors for Teranex Mini 8K

PostFri Jun 21, 2019 3:23 am

With quad link SDI connections, there are two primary signal formats:
  • Square Division Quad Split - each cable carries 1 quadrant of the image
  • 2 Sample Interleave (2SI) - every 2-pixels alternate between different cables
With Square Division, each cable carries 1/4 of the image, so each signal can actually be viewed independently if desired. With 2SI, you kind of need to recombine all of the samples (de-interleave them) to construct a full frame of video.

Square Division is a little bit simpler to implement, but it does have some downsides, particularly in terms of latency. Since all of the quadrants really need to be clocked together so they can be displayed at the same time, you kind of have to wait until you get the full frame so that you can divide it up and start transmitting (or technically the delay is only 1/2 a frame because once you have the top two quadrants of a frame, you can process the lower two quadrants line by line in real time).

With 2SI, there's almost no latency, since every two pixels go out to a different cable, there's no waiting around for a big chunk of the frame to split up. There's some more background and tradeoffs of the different approaches here:
https://blog.rossvideo.com/how-to-go-uh ... -equipment

Anyhow, getting back to the Teranex Mini 8K, from the tech specs it looks like the Teranex Mini supports both Square Division and 2SI signal formats on its SDI inputs. However, I don't think there is any standard for HDMI video over 4 connectors.

My guess is that the Teranex probably uses the square division quad split approach on its HDMI outputs, with each cable carrying one quadrant of the image. This is based on the fact that in the product pages there is some reference to using quad split to build a video wall from 4 monitors.

In terms of 8K TV options, the Sharp LV-70X500E can handle 8K video over 4 HDMI 2.0 connectors, but it seems like it is only being sold in Europe. Pretty much all of the consumer-oriented 8K TVs being released in 2019 are using HDMI 2.1 to input 8K video over a single connector.

I'm doubtful we are going to see many 8K TVs with the quad HDMI input option moving forward. It seems like everything is going the HDMI 2.1 route now that HDMI 2.1 chips are becoming more available.

Hopefully, the Teranex Mini 8K is firmware upgradeable to add HDMI 2.1 support allowing 8K video over a single cable. Otherwise you are going to need multiple screens to monitor in 8K in most cases.

Incidentally, HDMI 2.1 adds a bunch of new stuff to the HDMI spec (as if there weren't enough in there already). For example, HDMI 2.1 adds Display Stream Compression (DSC 1.2, also used in DisplayPort) to enable 8K60 video at higher than 4:2:0 sub-sampling, but still fit it within the 48 Gbps bandwidth spec.
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Andrew Kolakowski

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Re: 8K HDMI monitors for Teranex Mini 8K

PostFri Jun 21, 2019 10:57 pm

Dave Del Vecchio wrote:Hopefully, the Teranex Mini 8K is firmware upgradeable to add HDMI 2.1 support allowing 8K video over a single cable. Otherwise you are going to need multiple screens to monitor in 8K in most cases.

Incidentally, HDMI 2.1 adds a bunch of new stuff to the HDMI spec (as if there weren't enough in there already). For example, HDMI 2.1 adds Display Stream Compression (DSC 1.2, also used in DisplayPort) to enable 8K60 video at higher than 4:2:0 sub-sampling, but still fit it within the 48 Gbps bandwidth spec.


Well- without a clear statement I would not buy this box with HDMI in mind as it's most likely not HDMI 2.1 chip. If chip is not 2.1 capable then firmware update won't help. It was the same story with HDMI 1.4 modded vs. real HDMI 2.0 based devices.

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