Teranex Mini HDMI-SDI 12G 2160p50 not working?

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kal_jez

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Teranex Mini HDMI-SDI 12G 2160p50 not working?

PostTue Oct 08, 2019 6:39 am

Hi All

I'm trying to use a Teranex Mini HDMI-SDI 12G to ingest a PC input into a ATEM Constellation.
The Constellation is set at 2160p50 and I'm running the output to a 12G Ultra HD screen, the output of the Constellation is working fine on the screen at 2160p50 (both for multiview and mix out, bars etc). My problem is that I'm not seeing the output of the Teranex at 2160p50, it works fine when I set the PC to 2160p25 but not at p50. The strange thing is that I can see the PC image on the small screen on the Teranex (with 2160p50 correctly showing as the resolution).

The signal doesn't work on the Constellation or directly into the monitor and I even tried it on our Atmos and I've tried it with 2 different Teranex units. Doesn't work if I manually set the resolution and/or if I use Force UHD option. Setup works fine at 1080p50, 2160p25 etc.

I am missing something or does the unit not actually support 12G out? The SDI out LED is lit up.

Thanx for any ideas...
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kal_jez

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Re: Teranex Mini HDMI-SDI 12G 2160p50 not working?

PostWed Oct 09, 2019 1:11 am

Hi All

Just quick update, I managed to get this working by changing the Display Port to HDMI adaptor, went through a couple to get it to work properly, what confused me is that the small screen on the Teranex was showing the image so I assumed it should be working. Perhaps the monitor screen needs to be a little more informative on the signal status etc.

Thanx
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Dave Del Vecchio

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Re: Teranex Mini HDMI-SDI 12G 2160p50 not working?

PostWed Oct 09, 2019 4:18 am

HDMI 2.0 which is used for 2160p50 and 2160p60 signal formats also introduced YUV 4:2:0 chroma sub-sampling. Earlier versions of the HDMI specification (1.4 and earlier) which support resolutions up to 2160p30 were limited to YUV 4:2:2 color sub-sampling (as well as YUV 4:4:4 or full RGB 4:4:4).

So why is this relevant? Well, the Teranex Mini HDMI to SDI 12G converters do not seem to handle 2160p50 or 2160p60 video signals with 4:2:0 sub-sampling well.

When sending a 2160p50 or 2160p60 video signal @ 4:2:0 sub-sampling over HDMI into the Teranex Mini and connecting the 12G SDI output to various other Blackmagic gear (HyperDeck 12G, Duplicator 4K, Smart Videohub 12G, Teranex Express 12G), most of them have problems recognizing or processing the video signal sent by the Teranex Mini.

When switching to a 10-bit 4:2:2 input signal over HDMI to the Teranex Mini HDMI to SDI at the same resolution, everything works fine and the 12G SDI video output from the Teranex Mini is recognized properly by the same set of devices.

If this turns out to be the problem in your case, you could check to see if the video card driver in the computer you are using has any output setting options that would change what chroma sub-sampling is used when outputting 2160p50.

Additionally, how the Teranex Mini HDMI to SDI deals with 4:2:0 input signals has also changed with different firmware versions. With Teranex version 6.1.1 (which is the latest with any changes for the Teranex Mini HDMI to SDI 12G), I was not able to get any device to recognize the Teranex Mini's 12G output with a 2160p50 or 2160p5994/60 input @ 4:2:0 sampling. But rolling back to Teranex firmware 6.0, I am able to get the Teranex Mini's output to work with an ATEM Broadcast Studio 2 M/E (or now 4 M/E) switcher. The output to the HyperDeck 12G is still problematic, however.

So if you are on the latest firmware, you might try rolling back the firmware and see if this makes a difference.
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kal_jez

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Re: Teranex Mini HDMI-SDI 12G 2160p50 not working?

PostThu Oct 10, 2019 1:10 am

Thanks Dave

It's running on a Quadro 4000 so I was able to set the colour to 422 in in NVIDIA control panel and it does now seem stable.

Would be nice if BM added a bit more signal information onto the little screen at some stage :-). I normally just use decklink to feed out SDI directly but the software I'm using in this case (signage stuff) doesn't have that option.

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