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Joined: 12/5/2020(UTC) Posts: 1 
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Hi,
I am planning a setup for a church. Right now, I am debating between the Blackmagic ATEM Mini Pro and the Roland V-1HD+. Looks like the Roland might be my choice, but its double the price to the ATEM.
However, I had another idea and that's to use vMix. I think vMix is up for the task but there is one use case that I am fearing, that vMix may not be the best choice. Let me describe:
Our setup is simple. We will have 2 HD cameras. One is a PTZOptics Gen2, the other is the AIDA. I was planning to use HDMI for both of them. We want to live stream the service. However, I also need to use the livestream feed to be output on a TV screen (located in our basement) at the same time. The issue is audio/video sync. Audio is mixed with a mixer as per usual and then fed into the streaming PC for livestreaming on youtube. So the audio in the basement will be supplied by the mixer, the same way all audio in the church is played. So there is no delay. However, if I would play the video in the basement, I am worried, that the audio and video will be out of sync because the video has to "travel" thru the PC and get processed by vMix. I would purchase an HDMI capture card, if I use vMix. I know of another church that does this with a hardware video mixer. They are using the Roland for that. I would like to use vMix, because it seems to offer more flexibility.
Regarding the PC. The PC will do the live-streaming and service audio recording at the same time. It is a modern PC with Win10, 16GB memory and Ryzen 3700X with M.2 1TB SSD. So the PC performance should not be the issue as far as I can tell.
I would use a quad Blackmagic HDMI input card to capture 1080p/59 if I would use vMix.
So the questions are:
- How bad will the video delay be due to processing?
- Is vMix recommended for the setup I described above?
- Anybody doing this and what is your experience?
- If this is possible, would I have to change anything from my description?
Thanks for your help!
Cheers,
PB
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Rank: Advanced Member
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Joined: 3/17/2017(UTC) Posts: 422  Location: Luzern - Schweiz Thanks: 63 times
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Quote:I would use a quad Blackmagic HDMI input card to capture 1080p/59 if I would use vMix.
What distance do you have to cover with HDMI cables? HDMI cables should not be longer than 10 meters. You should cover long distances with SDI cables. HDMI converter to SDI, video mixer with SDI input. Quote:So the audio in the basement will be supplied by the mixer, the same way all audio in the church is played. All video mixers create a video delay. If you are using an audio mixer for the audio to transmit the audio, you will need to use a - delay line controller - to delay the audio. I use this controller: https://www.thomannmusic...pC-UtleAKkBoCkawQAvD_BwEweitere: https://www.bhphotovideo...IVE_PRO_Loudspeaker.htmlThe Delay parameter on the DCX2496 can be adjusted in milliseconds; up to 11.64ms for short delay and up to 582.24ms for long delay.
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Rank: Advanced Member
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Joined: 4/23/2017(UTC) Posts: 1,214  Location: Germany Thanks: 3 times
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If distances is low you can use HDMI. Otherwise use SDI.
An alternative to that would be NDI. Video over the network. You mentioned PTZoptics. They have NDI options available. With NDI you may need to get additional converters (HDMI/SDI to NDI) but once you made that investment you are very free in the use of Cams, Computers, and other equipment.
For the streaming PC you just need a network cable. Some cams can work with PoE which means you just need a network cable again to control and get video. On the other hand the network becomes more central. elying on the network means you need to have a focus on good equipment there as well.
My thoughts.
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Rank: Newbie
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Joined: 10/25/2020(UTC) Posts: 9  Location: Herpen Was thanked: 1 time(s) in 1 post(s)
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Hi,
The problem with delay is always an issue.
I have used vMix on live events once, but the delay was far greater than the Atem or Roland or Panasonic or name it, video mixers, so you are right on that account.
If you mix all the audio on an external desk and feed that back to vMix via an audio input, you will get a delay in vmix placing the audio roughly in sync with the video feed.
this will give you the option of outputting the video feed with audio to an external monitor in your basement.
this video feed will have a delay, but the audio feed has the same delay.
If you feed the audio directly to the basement from the mixer, it will be out of sync.
you could delay the audio feed to the basement from the desk or with an external audio delay if needed.
if you play the audio from a tv in the basement, the audio from the vMix will work fine.
(keep in mind that using NDI to input cameras will give extra delay to your feed. using capture cards is the fastest way to input video feeds to your PC.)
(using NDI to feed the TV in the basement from vMix will work, but keep in mind that the stream from an NDI source is quite large. so bandwidth is an issue then.)
good luck with your project.
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