SDI loop through with LTC embedder I was wondering if there’s a converter out there that would take a HD-SDI in, as well as a LTC in, and an SDI out. 

We currently have video feeds with no timecode embedded and was trying to loop through a feed of timecode which we can feed from a BNC.

I’m also seeing if it’s possible to make too! I know it is a thing that can happen considering Atomos Shoguns can feed in and LTC. I just need that without the screen.

If i fed to BNCs (a T Bar) into one out would that work? Is video and timecode able to be merged or would it be read as two feed signals?
It is quite possible to make, but think FPGA with 3 Gig SERDES (so probably a modest Kintex 7 or something similar) with a couple of SDI line IO parts (TI) and maybe a PLL from SI Labs, add some power conversion and a mess of VHDL, job done. 

Maybe a few months work.  

Obviously if you have LTC you can stripe that onto an audio track just using any old audio embedder, but I am guessing that does not really do it for you? 

I would be a little surprised if YellowBrix or maybe Decimator Designs do not have a box that does this. 

Regards, Dan.