Incoming UDP Stream - Picture completely messed up

Michael 2021-05-01 14:03:24 UTC in Nimble Streamer

I have a problem getting UDP to work.
When I stream to Nimble over UDP, the picture is full of blocks and artifacts, and the bottom half just shows vertical lines most of the time (see
It also happens if I use ffmpeg to stream to Nimble over UDP, using the command
ffmpeg -re -i video.mp4 -c:v libx264 -b:v 3M -c:a aac -b:a 192k -f mpegts udp://server:1234?pkt_size=1316 (it doesn't make any difference if I use pkt_size or not).

I have read the FAQ "Getting artifacts when streaming via UDP MPEG-TS or RTSP", added the parameter as told there, but the issue persists.

Can somebody help me?

Michael 2021-05-01 14:04:29 UTC 
Alexander 2021-05-01 18:32:06 UTC 

Hello, Michael.
If you're testing the MPEGTS UDP stream delivery in a reliable network environment and the mentioned issues are taking place, perhaps, the OS network stack needs to be fine-tuned.
In some cases, setting the following parameter in 'nimble.conf' helps too:
Feel free to open a ticket in our helpdesk for further investigation:
Thank you!

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