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Camera feed delay problems using FULLSCREEN to show live camera on Projector Screen
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tdurhamjr  
#1 Posted : Tuesday, January 26, 2016 3:37:56 PM(UTC)
tdurhamjr

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Hey guys, I need some help. I have setup our church main sanctuary on vMix and I am having a problem with the camera views becoming noticeably out of sync on the front projector screens. General setup info

Intel Core i7-5930K
32gb of ram
MSI I\VIDIA GeForce GTX 970 Gaming 4GB card
Sapphire AMD FirePro W4100 2GB GDDR5 Quad Mini DP PCI-Express Graphics Card (4 mini display ports)
2 Sony BRC-Z700 cameras
Decklink Quad capture card.
Portta PETHRSP HDMI to 1080P Component Video Scaler converter

I am running an HDMI output from MSI Video card to an HDMI splitter. From splitter, I have 2 HDMI outs going to the 2 HDMI>Component converters. We then have very heavy gauge component cable running from the AV Booth to the front projectors. I would estimate there is about 150-200 feet of cable from AV Booth to projector(s).
Sound board is a Yamaha M7CL that I feed all the audio into the PC for audio input (stream and local record).

It seems that the Video is slightly delayed (very slightly but noticeable). Then as the service goes on it seems to get worse. It seems that if I switch camera inputs for live view, the sync is not as bad right after the switch over.

I am wondering if I go out of the AMD Firepro card (mdp > VGA) and skip the HDMI conversion if that might help??

Thanks for any help on this!
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ask  
#2 Posted : Tuesday, January 26, 2016 7:40:00 PM(UTC)
ask

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What is the actual distance between devices? You might look at a wireless solution which I have found to be low latency, You will find a number of solutions an ebay/web. You will always introduce greater latency when you go through multiple devices and conversions.
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jhebbel  
#3 Posted : Wednesday, January 27, 2016 8:05:59 AM(UTC)
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As much as I love BM cards in video editing, I have heard of a lot of issues when using them in vMix. Also avoid using HDMI completely as the HDMI handshake can cause latency and the cable runs themselves are not very reliable.
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tdurhamjr  
#4 Posted : Wednesday, January 27, 2016 1:25:00 PM(UTC)
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ask wrote:
What is the actual distance between devices? You might look at a wireless solution which I have found to be low latency, You will find a number of solutions an ebay/web. You will always introduce greater latency when you go through multiple devices and conversions.

It is about 125' line of site between PC and the projectors. I did not want to go with wireless as that is one possible thing that can go wrong and cause a huge problem. But if that is my last resort I would certainly give it a try.
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tdurhamjr  
#5 Posted : Wednesday, January 27, 2016 1:29:10 PM(UTC)
tdurhamjr

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jhebbel wrote:
As much as I love BM cards in video editing, I have heard of a lot of issues when using them in vMix. Also avoid using HDMI completely as the HDMI handshake can cause latency and the cable runs themselves are not very reliable.


We were on a tight budget for this and I had an extra BM card that they could have. I am trying to get everything from PC to Projector to be VGA. This morning I plugged in a MDP>VGA adapter and then plugged in a VGA>RGB breakout cable.

On the other end I had a Component (5 plugs, one of which is V Sync and H Sync). Projector never worked. However, I am thinking that I need to have a VGA>RGB breakout on both ends instead of the RGB breakout on one end and Component>VGA adapter on the other. Going to go back up there later and try that.

The long cable that runs from the AV booth to the Projector is a component cable (red, blue, green, H Sync, V Sync). I think I can just use VGA adapters using only the RGB wires and maybe it will work?

I do think that getting rid of HDMI will get rid of the latency.

Thank ya'll both for the feedback!
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