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Non Grata  
#1 Posted : Thursday, December 6, 2018 2:48:32 AM(UTC)
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Hello,
I need some help with Vmix NDI. I want to use its NDI output in multicast, for many screens, but it does not work.
I use Access Manager (running as Admin) to swtich on multicast output. After that Scan Converter, installed on this PC, successfully goes multicast on this PC. But VMix NDI output is still unicast. What I'm doing wrong?

I found out that it is possible to send a video stream from vmix to Scan Converter, running on the same PC. And Scan Converter can already distribute multicast. But this solution consumes a lot of CPU resources. Can vMix ooutput multicast NDI on its own?
mavik  
#2 Posted : Thursday, December 6, 2018 7:09:39 AM(UTC)
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I haven't found a UI component in vMix to selec tbetween Uni- or Multicast. If the software option isn't possible at your end connect the vMix output to a spark. The hardware encoders seem to be able to use multicast as an option.
NDI isn't really build for display delivery. How would you decode the NDI at the displays?
Non Grata  
#3 Posted : Thursday, December 6, 2018 2:04:03 PM(UTC)
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Originally Posted by: mavik Go to Quoted Post
How would you decode the NDI at the displays?

Oh, nettop with NDI Monitor, of course.
ask  
#4 Posted : Thursday, December 6, 2018 3:01:46 PM(UTC)
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Originally Posted by: Non Grata Go to Quoted Post
Originally Posted by: mavik Go to Quoted Post
How would you decode the NDI at the displays?

Oh, nettop with NDI Monitor, of course.


Or a Birdog Mini http://www.bird-dog.tv/mini-overview/

Non Grata  
#5 Posted : Thursday, December 6, 2018 11:02:46 PM(UTC)
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It seems, that my problem is more complex. Now I try to connect two NDI monitors on different computers to Test Patterns Generator on the PC with multicast enabled. All devices have NDI Tools 3.7 installed. Same problem. Unicast only.
Then I used VLC for test multicast stream. It works fine.
Why NDI does not work in multicast?
Non Grata  
#6 Posted : Friday, December 7, 2018 6:01:19 PM(UTC)
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Hi guys, I have not been able to solve my problem. Is there anyone here who uses NDI in multicast mode? I want to stream NDI output from VMIX to multiple large monitors (NDI Monitor) during an event on Sunday. I can't turn on multicast mode. I am using Windows 10, running Access Manager from Administrator. IGMP Snooping is enabled on the managed switch. I don't know what to do. Please help.
DWAM  
#7 Posted : Friday, December 7, 2018 6:28:39 PM(UTC)
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I see your post everywhere except in the most obvious location : the Newtek NDI forum

AFAIK vMix does not support multicast NDI

I'm curious to know why you need NDI Multicast so much
- how many screens?
- is latency really an issue?
Non Grata  
#8 Posted : Friday, December 7, 2018 10:25:27 PM(UTC)
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Originally Posted by: DWAM Go to Quoted Post
I see your post everywhere except in the most obvious location : the Newtek NDI forum

AFAIK vMix does not support multicast NDI

I'm curious to know why you need NDI Multicast so much
- how many screens?
- is latency really an issue?



I can't ask a question on the Newtek forum yet. For two days waiting for the registration confirmation by the administrator.

Now I understand that vMix does not support multicast. Looking for another solution.

I have three real-time screens on stage and four screens outside the hall. I wanted a universal solution, but probably will have to connect the stage by NDI, and others by RTMP.
DWAM  
#9 Posted : Saturday, December 8, 2018 12:11:42 AM(UTC)
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Quote:
I have three real-time screens on stage and four screens outside the hall. I wanted a universal solution, but probably will have to connect the stage by NDI, and others by RTMP.


With vMix you will have "close to realtime" only for the 3 screens on stage. At best, 4/5/6 frames behind but latency will be noticeable. It would be the same with NDI anyway...

For the 3 screens I would go for direct cabling with an HDMI splitter on vMix PGM Fullscreen output. You need one splitter but you save 3 NDI receiving computers.

For the others 4 screens, latency is not a problem so I would go for Multicast UDP (TS) or HDMI to CAT5 converters (plugged to the splitter aswell).
For Multicast UDP you just need FFMPEG or VLC encoder on the server side and 4 RPI with VLC or FFPlay on the client side
HDMI to CAT5 converters will cost ~$100/150. You need 1 TX and 4 RX + a good switch and ETH cables. No computers needed.

You can also use a hardware encoder like this one below for Multicast UDP. I have one, very reliable, excellent image quality (at 25/32 Mbits), very flexible and cheap. You should have ~500ms latency with it.
https://www.ebay.com/itm...Live-Stream/292559029544

Quote:
others by RTMP.


No ! Worst possible choice for this

Guillaume
thanks 1 user thanked DWAM for this useful post.
mjgraves on 12/8/2018(UTC)
Non Grata  
#10 Posted : Saturday, December 8, 2018 2:00:50 AM(UTC)
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Thanks, man! I'm gonna try FFMPEG or VLC for Multicast UDP.
mavik  
#11 Posted : Tuesday, December 11, 2018 1:14:48 AM(UTC)
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You can use a Newtek Spark connected to the external out of vMix. The spark can be configured in unicast and multicast. As others have mentioned NDI out off vMix, OBS or Wirecast is unicast only. This workflow will have a noticeable latency.
I guess the problem is that you want to show the program feed on the stage monitors. The program out of vMix has always a few frames latency. If your budget allows for alternatives to vMix and you need real time screen display have a look at Ross Carbonnite Ultra (10k).
HDMI baluns are nice but need a dedicated cat connection. If you need to drill holes into walls it's maybe easier to use a multicast stream with ffmpeg where you can use existing network connectivity, assuming the network is multicast enabled.
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