Several inputs with same name

I need to capture video signal with ffmpeg on Ubuntu 16.04 server from 4 sources.
I'm using a couple DeckLink SDI Duo.
How can I separate several inputs with same name?

This is how it looks like:

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ffmpeg -f decklink -list_devices 1 -i dummy:
[decklink @ 0x557a1bc12ea0] Blackmagic DeckLink devices:
[decklink @ 0x557a1bc12ea0]     'DeckLink SDI (1)'
[decklink @ 0x557a1bc12ea0]     'DeckLink SDI (2)'
[decklink @ 0x557a1bc12ea0]     'DeckLink SDI (1)'
[decklink @ 0x557a1bc12ea0]     'DeckLink SDI (2)'


I found the answer to my question.
If you use

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ffmpeg -f decklink -sources

command, you can see id of each devices and capture signal with it:

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ffmpeg -f decklink -format_code Hi50 -i "DeckLink SDI (2)@46:00000000:002e0300" -f null /dev/null

This option is available in version 11 software.

[Cameron Nichols]

Hi Vladimir,

If you are running a desktop, you can change the display label is via the Desktop Video Setup utility - click on the device -> About tab -> Product Notes -> Label: field

If you are running headless, you can use the Desktop Video SDK sample DeviceConfigure to set the label.

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./DeviceConfigure -d 0 -n "New device name"

The label is linked to the persistent ID for the device, so the label is persistent across reboots.

Regards
Cameron