[PD] pix_video problem

Benjamin ~ 01xy benjah at free.fr
Fri Sep 27 14:32:52 CEST 2013


We are using a blackmagick decklink quad on linux
to get the signal threw pix_video, we use the bmdcapture command line
tool combined with ffmpeg so as to write on a virtual video device
created by v4l2loopback (cf

it works fine and it is stable even if we plug/unplug the video sources,
it allows us to capture 1080i video or PAL video encapsulated in the SDI
signal, but if we try to capture 4x1080i signals, the framerate is less
than 25fps as Pd is > 100% CPU


Le 27/09/2013 09:21, Etienne Landon a écrit :
> Hello list, my first message ! youpi
> Regarding Blackmagic on linux you have to use gstreamer through pdgst.
> There are two plugins "decklinsrc" and "decklinksink", this is working
> great !
> I think they are in the "bad" plugin set
> If this works the same in windows, perhaps you have to fisrt set the
> mode of the blackmagic before turning gem on. By setting up I mean
> selecting the appropriate input and video resolution.
> And I confirm, never change settings while using it, unplugging the
> blackmagic input whit gem on freezes my computer
> Etienne
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