[PD] pushing gem pix_video I/O

Marco Schretter mco at zimt.at
Fri Apr 17 02:34:48 CEST 2020


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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