ffmpeg + 2 quad HDMI recorders

We have 2 quad HDMI recorders in the same PC - Ubuntu 22.04
How can ffmpeg differentiate between input 1 of one board or the other for capturing ?
Capturing an image with a single board: eg:
ffmpeg -f decklink -i 'DeckLink Quad HDMI Recorder (1)' -y -frames:v 1 output.jpg

But DeckLink Quad HDMI Recorder (1) is the same for both boards:

ffmpeg -sources decklink

89:c577d090:00000000 [DeckLink Quad HDMI Recorder (1)]
89:c577d091:00000000 [DeckLink Quad HDMI Recorder (2)]
89:c577d092:00000000 [DeckLink Quad HDMI Recorder (3)]
89:c577d093:00000000 [DeckLink Quad HDMI Recorder (4)]
89:4b1031d0:00000000 [DeckLink Quad HDMI Recorder (1)]
89:4b1031d1:00000000 [DeckLink Quad HDMI Recorder (2)]
89:4b1031d2:00000000 [DeckLink Quad HDMI Recorder (3)]
89:4b1031d3:00000000 [DeckLink Quad HDMI Recorder (4)]

ls -all /dev/blackmagic/
total 0
drwxr-xr-x 2 root root 200 Mai 24 10:03 .
drwxr-xr-x 21 root root 4500 Mai 24 10:03 ..
crw-rw-rw- 1 root root 10, 122 Mai 24 10:03 io0
crw-rw-rw- 1 root root 10, 121 Mai 24 10:03 io1
crw-rw-rw- 1 root root 10, 120 Mai 24 10:03 io2
crw-rw-rw- 1 root root 10, 119 Mai 24 10:03 io3
crw-rw-rw- 1 root root 10, 118 Mai 24 10:03 io4
crw-rw-rw- 1 root root 10, 117 Mai 24 10:03 io5
crw-rw-rw- 1 root root 10, 116 Mai 24 10:03 io6
crw-rw-rw- 1 root root 10, 115 Mai 24 10:03 io7

Can you rename the devices in the Desktop Video set up application. This used to show the custom names in FFMPEG and allow them to be selected.

Can you rename the devices in the Desktop Video set up application. This used to show the custom names in FFMPEG and allow them to be selected.

Changing the labels in the Desktop Video app is exactly what we were looking for.
Thank you James !