[PD] pushing gem pix_video I/O

Marco Schretter mco at zimt.at
Fri Apr 17 22:37:13 CEST 2020


ok, i changed to a recent macpro and it works flawlessly. so the 
bottleneck was my mbp2013's graphic card.

i still could not find out how to output on the decklink sdi-outs... ?

ideas how to build a cheap tiny linux cam-freeze blackbox welcome.

yrs,
m

Am 17.04.20 um 02:34 schrieb Marco Schretter:
> dear all,
>
> unfortunately i'm forced to work with a mediaserver that is not 
> capable to do a live-cam freeze. now i'm trying to solve this by 
> building a osc-controlled blackbox with GEM (pix_buffer[read/write]).
>
> test-setup:
> decklink quad 2-8 capturecard 
> https://www.blackmagicdesign.com/de/products/decklink/techspecs/W-DLK-30 
> in sonnet frame
> macbookpro (2013)
>
> this testpatch works ok, but with 500-1000ms latency ...
> https://zimt.at/cam_freeze_v01.jpeg
>
> question:
>
> how can i push the latency and make it more "real-time" (whether with 
> pix_buffer or several pix_buffers or other objects)
>
> do you have experience how to push the GEM output to the decklink 
> sdi-out? i guess the rendering is done on the graphics card and not on 
> the decklink (?not openGL capable?) so mabe this is useless? so is the 
> macbookpro graphic card the bottleneck?
>
> merci
> marco
>
>
>
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