Wow, thank you Boris, this is actually a well thought out and perfectly explained solution to the problem I'm having.
However, there's a bit too much risk involved in it. I'm technically a contractor for a corporate environment and I have to make sure I'm building everything to essentially be idiot proof.
The fellas that run the studio do all their shading in camera. They have a comrex comm system and really only use the Talkback for the camera send and return feeds. I'm thinking since the solution you provided is a bit involved, they might get wary about it.
It seems as though the best path forward is to just purchase a GPIO tally system since we already have the comms in place.
This guy might be the solution I'm looking for.
https://www.bhphotovideo.com/c/product/1698517-REG/avmatrix_ts3019_6_ts3019_wireless_multi_camera_tally.html
I'd love to put in the Ultrix we have, but the 40x40 is more user friendly and the studio guys are more creative types and less broadcast.
Unfortunately I wasn't around when they built the studio a few years ago but it's my mess to fix now.
Thanks again for the solution! I'm sure someone who's in my same situation will find it highly helpful
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Andrew Marchand
Live Broadcast Engineer
Toronto Canada
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Original Message:
Sent: 04-18-2024 04:01
From: Boris salhaji
Subject: Carbonite GPIO to BM Talkback for Tally down SDI
Hi Andrew,
we used to operate an atem constellation 8K with BMD URSA broadcast G2 cameras ( the full rig with camera fiber and studio fiber ).
we also have an Ultrix and we recently switch from ATEM to an ultrix Acuity. But before that we sometimes used some third party switchers.
To induce tally into the URSA you can use the sub D 25 of the studio fiber converter and send a contact closure between the right pins ( see pinout in the manual)
there is only one trick you must put a 9v power into the contact closure. the each « CCU » is wating for a powered contact.
regarding the coms, you need to feed the return input with a signal including 16 embedded audio channels ( I don't remember which channels are replaced by the coms talk and listen feeds… you need to have a signal with those channels populated so that the BMD is able to replace it)
then you can connect your listen and talk feed into the CCU sub D 25. Another little trick: there is a wrong info the pinout document the talk and listen pins are inverted… ( pinout for mic is actually pinout for headset and headset is mic) I don't know if they update the manual…
for the shading operation an atem switcher is mandatory.
so to sum up
tallies
output contact closure from your carbonite and feed a studio fiber converter with those contacts puting a 9V power for each CCU ( take care to not put powerthe GPO on the carbonite side!!)
Coms and shading
I recommend to have a Atem ( with talkback functionality) to do the gateway
feed the atem with a carbonite PGM ( it will be your video return feed for the cams) it will be used to do the shading operation
and connect your com matrix in analog on the CCUs sub D 25 ( be cautious with the pinout)
hope this helps
best regards
boris
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Boris salhaji
EIC
France Télévisions
Original Message:
Sent: 04-17-2024 05:34
From: Andrew Marchand
Subject: Carbonite GPIO to BM Talkback for Tally down SDI
So I'm working on a new engineering project at work and I'm running into a bit of a roadblock.
We currently have a Media Studio that is running a BM ATEM 4 M/E, a BM 40x40 and a BM Talkback that is currently handling signal flow for Tally to some BM G2. Don't blame me, I didn't build the studio but I am fixing it. Lol.
I want to swap out the ATEM for one of the spare Carbonites that we have since it'll provide more of the features we need in the studio, which is 50% filming and 50% broadcast.
The current issue I am running into is I want to maintain the signal flow for the Tally on return SDI to the G2's, I want to remove the ATEM completely and swap it for the Carb. As it stands, the ATEM currently sends the Tally signal back through embedded SDI and I'm trying to find a solution that will convert the Carb's GPIO signal to embedded SDI. Real estate is at a premium currently and there's little chance I'll be able to run different cables.
I saw Skaathoj had a SDI-GPI link that would have worked exactly as I needed, but it seems as though they don't produce it anymore. I'm looking for alternatives that will do what I'm looking for. I know they have a ETH-GPI system, but I have no idea how I'd integrate that into the BM Talkback as I can't find any online documentation about it or have found anyone who's done something similar.
If anybody had info on how it would work that would be great. Other than that, different solutions would be appreciated also. If it helps any, the guys that run the studio do all of their shading in camera, they don't even use the BM software to shade so if I lose the ATEM completely, it will not effect our work flow.
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Andrew Marchand
Live Broadcast Engineer
Toronto Canada
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