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Forum Discussion
Petervk
Jul 30, 2020Aspirant
Trouble shooting NDI& Dante how to turn of QOS
Hey, im trouble shooting a NDI|HX multicamara setup that is performing poorly. Its a workstation running Windows & Vmix with hardware: 3960x 24 core, rtx2080S, 64gb 3200mhz ddr4 and a 480gb 900P Opt...
nmarques
Aug 13, 2020Guide
Are you using multicast or unicast?
I would also, according to NewTek guidelines, make sure Flow Control is enabled and Jumbo Frames are disabled.
NDI|HX is also low bandwidth so you shouldn't need the 10G port. Try it with a 1G port and watch bandwidth in Task Manager, as well as CPU usage.
What software are you seeing the poor video in? vMix? NDI Studio Monitor?
If your QoS is DSCP strict priority, I don't think it would affect NDI traffic since the packets aren't marked.
FWIW, I have about 8x full bandwidth NDI sources running very nicely on a M4200, but I'm doing all multicast.
Petervk
Aug 20, 2020Aspirant
Hey sorry for the somewhat late response.
Im only using unicast, all camera's are directly going in one network hop to the workstation only.
Jumbo frames are disabled and i experimented with flow control but unfortunatly it does not seem to impact the situation a lot.
Also tried 1g port, no difference, CPU usage is almost nothing.
The issue also remains when running at 720p low bandwith so its really strange.
In the mean time i did get a firmware patch because i complained 20mbps was way to low for 4k30p because lots of compression artifacts where visible on the footage.
They upped the limit to 51200kbps per camera so thats nice, no real impact on the somewhat inconsistent performance of the total system outside of better quality footage ofcourse.
Also checked its also not a single core that is experiencing any real load, disabled SMT but not much difference.
Disabled any virtualisation, also no effect.
degrading video is mostly seen in vmix but that logs it the most accurate.
Did lots of vmix tuning, ofcourse large input buffers but also with the advanced settings.
But OBS and wirecast experience similar issues.
I'm not even sure its the network thats at fault, its more of a how can i optimize everything as much as possible, because such a setup should be well in the posibility of running without hickups.
Wat are you're software solutions? and did you do any big network or software tweaks for the system?
I feel it does have something to do with inconsistent delivery of frames or frame times that give dropped frames, and i can reasonly accept that if a dropped frame is a I frame it will cause a notable hickup in the image, but this is just a thought without any real foundation
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