Video Signal Flow: Time, Quality, and the Noticeable Elements

The goal in any video system is to minimize signal conversion (up/down/cross) to a point where the total latency of the end-to-end signal flow is less than three frames.

Video Signal Flow: Time, Quality, and the Noticeable Elements
Every signal takes time to get from the source to the destination. This could be light from the lens of a camera, to the light projected onto a screen surface. It could be the worship graphics machine, like ProPresenter, to the LEDs on a huge scenic multi-panel LED wall.
Video Signal Flow: Time, Quality, and the Noticeable Elements
Every signal takes time to get from the source to the destination. This could be light from the lens of a camera, to the light projected onto a screen surface. It could be the worship graphics machine, like ProPresenter, to the LEDs on a huge scenic multi-panel LED wall.

Technology News

Second Day at LDI Features Exhibit Floor Opening, Solid Sessions
A Quick Rundown Of Day One At LDI
What To Account For When Building A Church’s Sound System From The Ground Up
Moving Lights: CHAUVET’s Maverick Series Add Up To Quality Fixtures

Technology Resource

Worship Facilities Magazine, September-October 2017
The September-October 2017 issue of Worship Facilities Magazine offers a glance at a Granger Community Church, and their recent install of a Lawo audio mixing console system.
·
Hammond WFX 2017

Marcus was a speaker at WFX this year in Dallas. For 2018, the conference is slated for Orlando in November. We hope to see you there.

From Point A to Point B

It’s 2017, and it’s very likely that your church has a video system. It could be a very large system with multiple cameras, a large video switcher or even a router, or it could be rather small, with a single projector and laptop.

In the video world, you are only as strong as your weakest link.

Whatever it looks like, video has to get from a source to a destination. And it needs to look good doing it. There are many ways to send video to various destinations across your church campus, but there are also many factors to consider when planning a full upgrade or replacing part of your signal flow.

Let’s discuss the factors that matter:

What is Latency?

Every signal takes time to get from the source to the destination. This could be light from the lens of a camera, to the light projected onto a screen surface. It could be the worship graphics machine, like ProPresenter, to the LEDs on a huge scenic multi-panel LED wall.

No matter the source or destination, the journey will take time – the question is: how much?

We find that an IMAG (image magnification) video system with less than three total frames of latency goes unnoticed by the viewer. Any more than three frames, though, and the viewer begins to notice a “disconnect” between the live talent and the screen in the same visual space – which can be a distraction.

The goal in any video system is to minimize signal conversion (up/down/cross) to a point where the total latency of the end-to-end signal flow is less than three frames. Each “stage” of scaling or conversion typically incurs half or one frame of latency, but up to two or three frames of additional latency are possible with some processors never intended for IMAG scenarios.

Digital vs. Analog

Digital signals like HD-SDI, HDMI, HDBaseT and ATSC RF Modulation are all great options, but they each have their limitations and are ideal for specific applications. Analog video signals like VGA (RGBHV) and Component Analog (RGB) are nearing or at end-of-life, but are still capable of producing high quality HD (720 or higher) signals, when needed.

Whatever the signal type you need to employ, the keys to a high quality image is the right cable, right connectors, proper installation and correctly calibrated equipment on both sides of the equation.


More About Marcus Hammond
With over a decade of church technical leadership and production experience, Marcus Hammond serves as Church Resource Director with Stark Raving Solutions, based in Lenexa, Kan. Hammond is passionate about helping local churches connect with their congregation and helping church technical teams reach a new level of success. He lives in Kansas City with his wife, Jill, and enjoys travel, Hi-Fi audio, and KC BBQ! Connect with Marcus on Twitter @marcus_hammond.
Get in Touch: marcus@starkravingsolutions.com    More by Marcus Hammond

Latest Resource

Worship Facilities Magazine, September-October 2017
The September-October 2017 issue of Worship Facilities Magazine offers a glance at a Granger Community Church, and their recent install of a Lawo audio mixing console system.


Article Topics

Technology · Video · Lighting · Projection · Streaming · Laptop · LED Wall · Projector · Screen Surface · Signal Flow · System · All Topics

Support and Enhance the Worship Message

The latest strategies for sound, lighting and facilities can help you better attract and engage with your congregation. With Worship Facilities’ insights on leadership, communication and administrative tools, each issue shows you how to design and maintain your facility and how to adapt it to meet the changing needs of today’s members.
Explore the success stories of others, and find ways to enhance your weekly services. Get a free subscription to Worship Facilities magazine. Subscribe today!

Comments

©2017 Worship TechDirector · A Division of EH Publishing, Inc. d.b.a EH Media. All Rights Reserved.