I've tried to figure out why NDI is dropping frames at source when transcoding incoming SRT feeds, which shouldn't be happening on a dedicated win10/i7/rtx4000/32GB RAM machine. I tried different network cards, different network configuration, etc. Added cache memory. Nothing seems to work and I can't find any further performance fixes. Other NDI sources work great on that computer to the same RX machines. How can I verify my performance and nimble setup? SRT restreaming has a 99% packet loss to computers on the same switch (more than one switch tried).
Could you please clarify the stream flow?
e.g. [NDI source > Nimble transcoder > SRT streaming] ?
Regarding the SRT losses, were such essential parameters as 'maxbw' and 'latency' defined in the SRT streaming settings? More details:
To get the SRT stats in realtime for diagnostic purposes, you can use the following Nimble API method:
SRT source > WAN IN > Nimble > SRT out + Transcoder > NDI
I did set maxbw and latency as listed in that guide, could you verify parameters for a 8000 Kbps stream for maxbw is 8000 and i set latency at various settings from 400ms up
Thank you for the link that is useful all around.
The 'maxbw' value is defined in bytes-per-second, your defined 'maxbw' of '8000'=8KBps=64Kbps.
Try setting 'maxbw' to '2000000' =2MBps=16Mbps, i.e. twice the actual stream bandwidth for a test.
Also, the 'maxbw' can be set to '0' to trigger its autoselection.
The 'latency' value of '400' =400ms should be okay if you're streaming in LAN.
Ok maxbw is set and srt is showing very clean on the test player but when it converts to NDI it gets chunky and loses frames. HVEC option in Larix doesn’t show image only audio in either
Did one more test, rebooted machines, refreshed some things, SRT is working pretty well. maxbw is set to 2000000 and I'm pleased with the results, but NDI is still dropping frames at the encoder. I can't get a solid 60fps out of 1080 60 srt input.
I would suggest opening a new ticket at wmspanel.com/help as we need some sensitive information about your setup. Please include the server name.
Have you reached a conclusion? we have the same packet loss problem in NDI with SRT and NDI together. Our difference is that we pass the NDI directly without going through a transcoder-nimble, the SRTs do. Let's see if you can help us, thanks.
Could you open a new ticket at wmspanel.com/help and provide more technical details on your issue.
Hello, I have the same drop problem in transcoding from SRT to NDI, so so I'm interested in the solution please.
This question needs more technical details we can't discuss at the open forum, please open a ticket as suggested above.
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