BM UHD/4k converters – some gotchas

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BM UHD/4k converters – some gotchas

https://www.blackmagicdesign.com/products/miniconverters/techspecs/W-CONM-17

I’ve used a few of these guys recently – Blackmagic’s quad HD/SDi input to HDMI 2.0 output for taking the UHD / 4k (either tile or 2SI standard) and making something that will display on a 4k domestic TV.
They seem to work quite well, but here are a few things that I had to get around:
  1. Firmware – I had two identical ones and I initially tested both with Quad-SDi out of Avids at UHD (3840×2160 at 25 & 30P) – all good. But when I started a 4k project (4096×2160 at 24P) only one worked – the other showed nothing on it’s HDMI output. Eventually discovered only one of them had current (v.7 as of May 2016) firmware!
  2. Power cycle if colour space wrong – both have periodically decided they are going to mistranslate Y, Cb, Cr -> R, G, B – power cycling fixing it; hopefully the next firmware update will stop this?
  3. Four signals are always interpreted as UHD; if the Avid is running an HD project the four SDi feeds out of the back are all identical and the converter has no way of knowing it’s not quad-link. The Tektronix 8200-series and the Canon VP3010 monitor both have to be told (and I set presets for just this) but the BM converter needs to see three or fewer signals to realise it’s only a 1920×1080 raster. In the case of this job setting up two macros on the video router (one to route all four, one to send a non-used input to i/p’s B, C, & D of the BM).
  4. Glad I’m rocking a MacBook Pro! I would not have been able to update the firmware otherwise as I’ve yet to move on from Windows 7 – and the workshop PC is still 32-bit Windows 7!
By | 2016-10-29T08:54:39+00:00 May 12th, 2016|Categories: Broadcast Engineering, Products, tips|Tags: , , |0 Comments

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