NDI Routing freeze/delays

[roddyp]

We're using the NDI SDK Routing functions (NDIlib_routing_change etc.) to switch sources around, viewing with Studio Monitor 3.8.

The effect is that the audio switches within a couple of frames, but the video freezes for one second before switching.

I guess a lot of this is the nature of compressed video and i-frame frequency, but it's odd that the delay seems to be so consistent, even though the timing of the switch commands is hopefully unrelated to the i-frame positions.

Anything we can do to minimise the delay, or at least audio and video to switch in sync?

 

[ORFAST]

I can confirm the issue.
The issue exists in the latest NDI SDK 4.0 RC as well.

 

[ddv2005]

It because of delay "feature" in NDI library send loop. Delay depends on destination port number and can be 0,1 or 2 seconds. During this delay sender discard all video frames to new client. Tricaster allocate port numbers that have 0 delay but regular NDI client library allocate ports that have 1 seconds delay. I have reported about this "feature" to NewTek about year ago but it still not changed.

 

[ACross]

Anything we can do to minimise the delay, or at least audio and video to switch in sync?

Shoot me an email on [email protected], this is an issue we really should get resolved and has been there for some time.

Andrew

 

[roddyp]

Thanks for the reply, Andrew. We're in the next hall to you (6.C19) so I'll try and drop by tomorrow. Aware you may have a busy schedule even though it's the last day.

 

[ACross]

Thanks for the reply, Andrew. We're in the next hall to you (6.C19) so I'll try and drop by tomorrow. Aware you may have a busy schedule even though it's the last day.

Unfortunately I already left the show I wish I'd managed to catch up to you in person.

 

[ORFAST]

Is there any news about this bug?

 

[ACross]

Is there any news about this bug?

Send us an email at [email protected] and we can help work out how to solve this for you.

 

[ORFAST]

Send us an email at [email protected] and we can help work out how to solve this for you.

Thanks, Andrew.

 

[Rene Yu]

Hi Roddyp,
This is Rene Yu who talked with you at your IBC booth. I'm still waiting for a NDI Router product who can switch the source instantly without any freeze/delays.
I saw Andrew reply you. So I hope this problem could be solved soon.

 

[m9925830]

Hi all,
I noticed this issue still exists in the latest NDI SDK 5.5
Is there already a workaround available?

Kind regards,

Carl

 

[frifoxz]

In my setup I found switching to UDP uni/multicast as transport method made route switches instant. TCP always resulted in a ~1s freeze/black-screen when switching routes.