Wed 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.