[FFmpeg-user] DeckLink Duo 2 duplex_mode doesn't work

[Rik Roukens]

I couldn't help myself and just tried remotely, it appears I might have
gotten some part to work.
In one terminal, i run:

ffmpeg -format_code Hp25 -f Decklink -duplex_mode half -i 'DeckLink Duo
(1)' -c:v libx264 -preset ultrafast -map 0 -segment_time 20s -f segment
/media/primary/rolrec_cam3/output%03d.mp4

setting the duplex_mode of DeckLink Duo (1) to half duplex. This run just
fine. Then in a second terminal window I run:

ffmpeg -format_code Hp25 -f Decklink -duplex_mode half -i 'DeckLink Duo
(3)' -c:v libx264 -preset ultrafast -map 0 -segment_time 20s -f segment
/media/primary/rolrec-cam2/output%03d.mp4

This also starts recording, However, since I'm not at the office, I can't
actually check.

Thinking a step further, when I run:

ffmpeg -format_code Hp25 -f Decklink 'DeckLink Duo (1)' -duplex_mode half
-f Decklink -i 'DeckLink Duo (3)' -c:v libx264 -preset ultrafast -map 0
-segment_time 20s -f segment /media/primary/rolrec-cam2/output%03d.mp4

It gives me the following output:

[decklink @ 0x56122ec124c0] Cannot Autodetect input stream or No signal
DeckLink Duo (3): Input/output error

Which makes me slightly hopeful this might actually work tomorrow when I
plug an actual camera feed into DeckLink Duo (3).
Previously my errors have said can't enable video input, that's now gone,
right now it just doesn't detect any input (which is factual as no camera
is connected).

Let's see tomorrow, step by step I guess!

Thanks all so far. Any comments from people if they think this might work
or better ways are also appreciated!

Rik



On Wed, Aug 7, 2019 at 8:06 PM Rik Roukens <rik.roukens at theoceanrace.com>
wrote:

> Thanks for your response Mustafa, the cards are definitely capable of it,
> as I've done it in windows.
> perhaps you need to set the duplex mode on 1 and 2, which then opens up sdi
> 3&4 to be individually programmed.
> I'll give that a go tomorrow, it sounds a bit strange, as it would mean
> that you always have to run a command on input 1 and 2 before you are
> 'allowed' to use sdi input 3 and 4.
>
> I'll report back tomorrow.
>
> Rik
>
>
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> On Wed, 7 Aug 2019 at 19:48, Mustafa Al Ani <mustafalani at gmail.com> wrote:
>
> > Hi Rik,
> >
> > I think the duplex mode is only supported in ports 1&2.
> >
> > Apart from that, I have never been able to enable video input on 3&4, I
> > spoke with Blackmagic support but never got a useful answer. Never trust
> > what they write in their products descriptions.
> >
> > Please let me know if you got video input on 3&4, I would very much like
> to
> > see it working.
> >
> > Regards,
> > Mustafa
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