Multiple DeckLink Duos naming issue(FFmpeg, Linux)

Hello everyone!

So I've built some FFmpeg(3.2.14) on CentOS(7.4.1708) with DeckLink and Intel Quick Sync Video(QSV) support and we have two DeckLink Duo cards connected to the machine. The question is how to identify those cards inputs in ffmpeg commands, since they have same names, i.e.

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ffmpeg -f decklink -list_devices 1 -i dummy
[decklink @ 0xb94d40] Blackmagic DeckLink devices:
[decklink @ 0xb94d40]   'DeckLink Duo (1)'
[decklink @ 0xb94d40]   'DeckLink Duo (2)'
[decklink @ 0xb94d40]   'DeckLink Duo (3)'
[decklink @ 0xb94d40]   'DeckLink Duo (4)'
[decklink @ 0xb94d40]   'DeckLink Duo (1)'
[decklink @ 0xb94d40]   'DeckLink Duo (2)'
[decklink @ 0xb94d40]   'DeckLink Duo (3)'
[decklink @ 0xb94d40]   'DeckLink Duo (4)'

And here's the output in dmesg log:

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[root@localhost ~]# dmesg | grep DeckLink
[    2.307671] BlackmagicIO: Enabled device "DeckLink Duo 2 (1)" x4/5 Gbps (d5c4efb0,510100) FW Date: 06-12 10:35
[    2.308538] BlackmagicIO: DeckLink Duo 2 (1) as blackmagic!io0 [0000:01:00.0]
[    2.308629] BlackmagicIO: Enabled device "DeckLink Duo 2 (3)" x4/5 Gbps (d5c4efb2,510101) FW Date: 06-12 10:35
[    2.309434] BlackmagicIO: DeckLink Duo 2 (3) as blackmagic!io1 [0000:01:00.0]
[    2.309525] BlackmagicIO: Enabled device "DeckLink Duo 2 (2)" x4/5 Gbps (d5c4efb1,510102) FW Date: 06-12 10:35
[    2.310305] BlackmagicIO: DeckLink Duo 2 (2) as blackmagic!io2 [0000:01:00.0]
[    2.310401] BlackmagicIO: Enabled device "DeckLink Duo 2 (4)" x4/5 Gbps (d5c4efb3,510103) FW Date: 06-12 10:35
[    2.311164] BlackmagicIO: DeckLink Duo 2 (4) as blackmagic!io3 [0000:01:00.0]
[    2.311416] BlackmagicIO: Enabled device "DeckLink Duo 2 (1)" x4/5 Gbps (b72ef1b0,510200) FW Date: 06-12 10:35
[    2.312142] BlackmagicIO: DeckLink Duo 2 (1) as blackmagic!io4 [0000:02:00.0]
[    2.319744] BlackmagicIO: Enabled device "DeckLink Duo 2 (3)" x4/5 Gbps (b72ef1b2,510201) FW Date: 06-12 10:35
[    2.320336] BlackmagicIO: DeckLink Duo 2 (3) as blackmagic!io5 [0000:02:00.0]
[    2.324171] BlackmagicIO: Enabled device "DeckLink Duo 2 (2)" x4/5 Gbps (b72ef1b1,510202) FW Date: 06-12 10:35
[    2.324920] BlackmagicIO: DeckLink Duo 2 (2) as blackmagic!io6 [0000:02:00.0]
[    2.325026] BlackmagicIO: Enabled device "DeckLink Duo 2 (4)" x4/5 Gbps (b72ef1b3,510203) FW Date: 06-12 10:35
[    2.325747] BlackmagicIO: DeckLink Duo 2 (4) as blackmagic!io7 [0000:02:00.0]


And a list of blackmagic devices inside /dev:

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[root@localhost ~]# ls -l /dev/blackmagic/*
crw-rw-rw-. 1 root root 10, 58 May 24 19:02 /dev/blackmagic/io0
crw-rw-rw-. 1 root root 10, 57 May 24 19:02 /dev/blackmagic/io1
crw-rw-rw-. 1 root root 10, 56 May 24 19:02 /dev/blackmagic/io2
crw-rw-rw-. 1 root root 10, 55 May 24 19:02 /dev/blackmagic/io3
crw-rw-rw-. 1 root root 10, 54 May 24 19:02 /dev/blackmagic/io4
crw-rw-rw-. 1 root root 10, 53 May 24 19:02 /dev/blackmagic/io5
crw-rw-rw-. 1 root root 10, 52 May 24 19:02 /dev/blackmagic/io6
crw-rw-rw-. 1 root root 10, 51 May 24 19:02 /dev/blackmagic/io7

Any way to rename inputs to give them unique names for FFmpeg?

Ok, I have found a solution myself. All I had to do is to draw my attention to the DeckLink Sample directory(in my case it's /root/Blackmagic_DeckLink_SDK_10.11.4/Linux/Samples/bin/x86_64), namely to the DeviceConfigure utility, which allows us to rename default inputs like this:

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./DeviceConfigure -d 1 -n 'SomeNewInputName'

And the new name will survive a reboot!