You have to choose 1-4 or 5-8 for inputs and leave the other group to the outputs
You are currently playing in all channels the first input, which is configured as an output in the config.
So in the config set:
- Channel 1: device 5
- Channel 2: device 6
- Channel 3: device 7
- Channel 4: device 8
And then send the commands:
PLAY 1-1 DECKLINK DEVICE 1
PLAY 2-1 DECKLINK DEVICE 2
PLAY 3-1 DECKLINK DEVICE 3
PLAY 4-1 DECKLINK DEVICE 4
(Or the device you want for each one, I’m assuming you want to make some kind of matrix with overlays or something)
Depending on the version of the server you are using you might need to set FORMAT 1080p5000 (or the input format) for it to work properly or set the output format exactly to the input format.
PS:
If you want to just overlay graphics without any manipulation to the input image, you should enable internal keying instead of playing the input on a channel. It will give you a lot better performance. You just group the inputs differently in the cards.