Hi Marco, i tested a couple of years ago with a MacPro 2013 and a blackmagic card connected through thunderbolt. The minimum latency was ~200ms and was about the same with quicktime and Pd/Gem (i used the quicktime plugin anyway). If your SDI out is not visible as a monitor output you would need an extra tool to send it there, maybe something exists with syphon? If you need to work with OpenGL maybe shaders could help you (check [glsl_program]). all the best,
-jonas > Am 17.04.2020 um 02:34 schrieb Marco Schretter <[email protected]>: > > 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 > > > > _______________________________________________ > [email protected] mailing list > UNSUBSCRIBE and account-management -> > https://lists.puredata.info/listinfo/pd-list _______________________________________________ [email protected] mailing list UNSUBSCRIBE and account-management -> https://lists.puredata.info/listinfo/pd-list
