I try to explain this as simple as possible.
When you configure your decklink-card in the CasparCG config-file you have to leave on Decklink-channel unused if you want to use it as a Input. The reason is that in the config-file your define your Output-channels and the reserve those as Outputs and Decklink-channels can just be In- OR Outputs not both.
I usually dont use in config-file Decklink device 1 for a input instead I use Device 2 or 3 for the output of channel 1 (depending on Decklink-card).
If you are using the SVT default client there is in Tools/other “Decklink Input”, drag that to your rundown and in the right hand panel start to fill in Input Ex Server=local, channel 1, layer 10, The comes the more important Decklink Input-section.
In Device you set the Decklink that isnt configured as an output
In Format set the right resolution or no video will show
the rest you can forget
So now you have configured it, next you need to test this
To test you need a videosource that you know what resolution it give out and a monitor.
The test starts by checking that your output is OK, so Play a video on Caspar Channel 1 and confirm that it is playing in the monitor.
When that step is done the we move to checking the input. So connect your Source to decklink and start playing the input on the same channel that you just used for playout. What this do is that the client is sending the command that Maurice78 wrote to the server.
To do this you need a decklink-card that has at least 2 channels, I uses nowadays almost just Duo2. This is my config-file for doing one channel Fill-key, one just Fill and one Input
<?xml version="1.0" encoding="utf-8"?>
And this is my guide for my user concerning the Decklink-setup
Decklink Duo2 configured as 1 graphicschannel(Fill+Key) + 1 storychannel(Fill) + 1 Inputchannel (device1)
Start with downloading and installing BlackMagic Design Desktop Video setup https://www.blackmagicdesign.com/support/family/capture-and-playback
start Desktop Video Setup
each dot (under the picture) represents BNC, I will call them BMD1, BMD2, BMD3 and BMD4.
Choose BMD1 and press the edit-icon. On the first “Video Output”-sheet select your working resolution and on the “Connectors”-sheet select “SDI 1”
Choose BMD2 and press the edit-icon. On the “Video Output”-sheet select your working resolution and on the “Connectors”-sheet select “SDI 3&SDI 4”.
Choose BMD3 and press the edit-icon. On the “Video Output”-sheet select your working resolution and on the “Connectors”-sheet select “SDI 2”
ChooseBMD4 and press the edit-icon. On the “Video Output”-sheet select your working resolution and on the “Connectors”-sheet confirm that there is “none”
With the config-file below this will give you the following output (from left to right) ref - SDI IN - Channel 2 Fill Out - Channel 1 Key out - Channel 1 Fill out
Sorry for a long explainer