logo

Live Production Software Forums


Welcome Guest! To enable all features please Login or Register.

Notification

Icon
Error

Options
Go to last post Go to first unread
KirkKelso  
#1 Posted : Monday, October 15, 2018 2:47:06 AM(UTC)
KirkKelso

Rank: Newbie

Groups: Registered
Joined: 10/15/2018(UTC)
Posts: 3
United States
Location: Cleburne, Texas

We have recently set up an NDI network at our church to run a video feed to all our hallway TVs. We are issuing VMix to a gigabit switch to 4 Zotac mini PCs running NDI studio monitor. Will be running to a couple more once we get our issues figured out.

Currently our issue is the quality on the video feed is real grainy. And on one of our TVs, the longest run, drops frames real bad then eventually just freezes.

We’ve added a cat5 signal booster to the one that is the longest run but it hasn’t helped.
zenvideo  
#2 Posted : Monday, October 15, 2018 3:23:11 AM(UTC)
zenvideo

Rank: Advanced Member

Groups: Registered
Joined: 5/13/2014(UTC)
Posts: 281
Man
United Kingdom
Location: Manchester, UK

Thanks: 1 times
Was thanked: 123 time(s) in 78 post(s)
Do you see anything different, in terms of video quality, if only one of the mini PCs is running Studio Monitor? And what does the quality look like if you run Studio Monitor on the vMix PC? I'd suggest running each one individually (i.e. just one mini-PC at a time) to check you get a decent picture, and then try adding more. If the quality drops when you're running more PCs then check the network data rate being sent from the vMix PC.
KirkKelso  
#3 Posted : Monday, October 15, 2018 12:05:16 PM(UTC)
KirkKelso

Rank: Newbie

Groups: Registered
Joined: 10/15/2018(UTC)
Posts: 3
United States
Location: Cleburne, Texas

I’ll check this tomorrow when I get in. Thanks!
DWAM  
#4 Posted : Monday, October 15, 2018 6:42:24 PM(UTC)
DWAM

Rank: Advanced Member

Groups: Registered
Joined: 3/20/2014(UTC)
Posts: 2,030
Man
France
Location: Bordeaux, France

Thanks: 145 times
Was thanked: 565 time(s) in 446 post(s)
NDI is definitely not the ideal choice for distribution to multiple screens.

Why?
- it requires very powerful, thus expensive, computers for each monitor
- it requires a lot of bandwith which might saturate very quickly a basic natwork infrastructure
- it's not really easier to manage remotely than other protocols

All this makes it the most expensive and the most demanding protocol to use with no real benefit.

What solutions then?
Something like Multicast UDP is highly recommended for the exact use case you described (unless you absolutely need low latency or real time):
- requires a simple FFMPEG script to generate the feed out of vMix (or a cheap external encoder, less than $200 if you prefer)
- will run perfectly on a $35 Raspberry Pi connected to the monitor
- will only use a total of 10/12 Mbits for bandwidth in order to feed up to 250 screens, this will work on basic networks even with a crappy Wifi with an excellent image and sound quality
- automatic play can be very easily scripted on the player side so that no manual intervention is required to start playing

If you need low latency a simple pack of HDMI to CAT5 converters like this one https://www.amazon.com/M...rk-HSV373/dp/B00T76THZ2/ is much better
With 1 sender unit, you can feed up to 253 receivers. No computers needed at all.

Summary
Multicast UDP is at least 10 times less expensive, delivers an equivalent image quality as NDI using at least 10 times less bandwidth thus it's 100 times easier to deploy and run.
HDMI to CAT5 solution costs a little more but it's all automatic, just plug and play!

NDI is for production, not distribution...

My 2 cts
Guillaume
thanks 3 users thanked DWAM for this useful post.
mjgraves on 10/16/2018(UTC), Ronald555 on 10/16/2018(UTC), Barney Box Lane on 10/16/2018(UTC)
KirkKelso  
#5 Posted : Monday, October 15, 2018 11:42:37 PM(UTC)
KirkKelso

Rank: Newbie

Groups: Registered
Joined: 10/15/2018(UTC)
Posts: 3
United States
Location: Cleburne, Texas

Yes we definitely need low latency. We were looking for an HDMI solution like this to just come out of our switcher but couldn't find anything this cheap. Man this would've saved us money on buying all the mini pcs. We saw someone post about using NDI in their church to send a feed to one room and he didn't have any issues. So we went with it. I will propose this option to the higher ups..
Users browsing this topic
Forum Jump  
You cannot post new topics in this forum.
You cannot reply to topics in this forum.
You cannot delete your posts in this forum.
You cannot edit your posts in this forum.
You cannot create polls in this forum.
You cannot vote in polls in this forum.