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Extreme NDI delay, thoughts? *SOLVED*
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zaijian  
#1 Posted : Friday, May 8, 2020 5:12:08 AM(UTC)
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We're seeing a severe delay in the NDI source on the vMix side, on the order of anywhere from 4-12 seconds.

Here's our setup:

==========
DESTINATION:

* AMD Ryzen 3600
* 32GB ram
* 512TB nvme ssd
* GTX 1650 super

vMix 23:

* 2x 4k camera sources (Sony AX53) via elgato HD60s+
* 1x NDI source used in overlay
* 1x audio source from the board via iConnectAudio
* 2x intro/outro timers
* 2x intro/outro videos

SOURCE:
2015 i7 model Macbook
16GB ram

ProPresenter 6:
1x stage display
Syphon2NDI

NETWORKING:
* both computers plugged into the same physical switch (Netgear GS108PE-300NAS), confirmed both are running at 1000mbps
* destination PC is streaming with vMix to restream.io
* minimal network usage elsewhere
==========

Any ideas on what the problem could be?
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ask  
#2 Posted : Friday, May 8, 2020 9:16:40 AM(UTC)
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This usually indicates a network component has become overloaded. Usually a port on the switch or a NIC. The workaround is to reboot/restart TX or RX devices.
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zaijian  
#3 Posted : Friday, May 8, 2020 10:10:13 AM(UTC)
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Originally Posted by: ask Go to Quoted Post
This usually indicates a network component has become overloaded. Usually a port on the switch or a NIC. The workaround is to reboot/restart TX or RX devices.


All 3 devices, NDI server, network switch, NDI client, were shut down and restarted - no difference.

The switch was brand new out of the box, and shouldn't require any configuration, but any suggestions on settings to check? QoS? frames?
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zaijian  
#4 Posted : Monday, May 11, 2020 5:41:40 AM(UTC)
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Originally Posted by: zaijian Go to Quoted Post
Originally Posted by: ask Go to Quoted Post
This usually indicates a network component has become overloaded. Usually a port on the switch or a NIC. The workaround is to reboot/restart TX or RX devices.


All 3 devices, NDI server, network switch, NDI client, were shut down and restarted - no difference.

The switch was brand new out of the box, and shouldn't require any configuration, but any suggestions on settings to check? QoS? frames?


It was the switch apparently - swapped it out with a comparable linksys and NDI worked flawlessly
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SalG  
#5 Posted : Monday, May 11, 2020 6:30:29 AM(UTC)
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Out of curiosity, what are the brand/models of the switches?

Thanks,
Sal
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zaijian  
#6 Posted : Monday, May 11, 2020 2:21:22 PM(UTC)
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Originally Posted by: SalG Go to Quoted Post
Out of curiosity, what are the brand/models of the switches?

Thanks,
Sal


Problematic switch was Netgear GS108PE-300NAS. Plugged it in straight out of the box, didn't attempt to update firmware or anything. Didn't see anything in the web admin UI that would've affected that.

The new switch that worked without any problems was the Linksys LGS108P.
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thanks 1 user thanked zaijian for this useful post.
SalG on 5/12/2020(UTC)
mavik  
#7 Posted : Wednesday, May 13, 2020 6:14:01 PM(UTC)
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I can recommend mikrotik devices.
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stigaard  
#8 Posted : Wednesday, May 13, 2020 6:24:30 PM(UTC)
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Originally Posted by: zaijian Go to Quoted Post
Problematic switch was Netgear GS108PE-300NAS. Plugged it in straight out of the box, didn't attempt to update firmware or anything. Didn't see anything in the web admin UI that would've affected that.


Did you check whether EEE (Energy efficient ethernet) was active on the switch? It would be a problem.

For NDI use, it is always preferable to disable all EEE in switches, so you ensure the switch is not automatically throttling traffic.
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