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

Marton Balint cus at passwd.hu
Wed Aug 7 21:58:58 EEST 2019

On Wed, 7 Aug 2019, Rik Roukens 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.

Yeah, I think that is how I use all 4 inputs right now.

I wonder if this changes if you compile against 11.x SDK, since they 
changed how the duplex mode is set up.

Probably this can be worked around from software, so ffmpeg could be smart 
enough to enable half duplex mode even if the specified input is the 
"slave" connector.

In any case, there is also the option of specifying the default duplex 
mode (and saving it) with the control panel application, or its linux 
counterpart. I believe in that case the duplex mode should simply work, 
because that becomes the default mode...


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