Continous Artnet streaming...

[samsc]

That's one of the main problems with DMX over Ethernet systems such as Artnet. It's UDP, so packets can get lost and if they do it can have devastating visual effects as we all know. Murphy's law does say it will lose the off packet patched right in the middle of your screen

I think that continuous unicast would be the best solution, I can tell you that the datagate can definitely handle 25fps unicast for all 8 ports.

Thanks

Nicolas
www.enttec.com

thanks nicolas.

please try to test with continuous data up to 30fps across all 8 - thats what the americans use.
people do use this to playback video across huge backdrops on tv shows - and its vital that nothing ever drops a frame - really vital-
thats why im baffled by the frame drop thing- this stuff almost always gets used at peak load. hammered.

the test you need to make with your boxes is this - strobe flash black and white at maximum speed with no glitching - ever.

This is how i benchmark these systems - if they cant handle this -they simply arent good enough.
Have to be able to handle black white strobing with no glitching and no latency.

its comes across as a huge glitch on shows - you dont want section of a backdrop ever go missing.
I did some tv shows last year with 100m of backdrop- and it all needs to work.

on the size and scale that this stuff is visible - nothing should ever drop anything.

i have never seen udp packet loss as an issue

richard

[enttec]

Richard

This is how we test, and we haven't seen any problems with unicast.
If someone, has experienced differently please contact me

Nicolas
www.enttec.com

[enttec]

i have never seen udp packet loss as an issue

richard

Packet loss can happen anywhere, it's impossible to make sure it never happens.
A switch will drop packets, the nodes can drop it if 2 packets arrive too close to each other or it get's busy ....
The tcp/ip stacks that all of us use can drop UDP without warning for a number of reasons.

What I'm saying is because there is no ack, there is no way of knowing that the off frame was ever received. UDP was designed for cases where you don't care about losing packets, in these applications we do.
So there are 2 options either switch to TCP which was designed specifically for making sure every packet got to destination (unlikely) or stream Unicast UDP packets continuously. That way if a packet does get lost it will only be until the next update which would hopefully very shortly after.

Thanks

Nicolas
ww.enttec.com