In Broadcast - NAB SHOW 2017 - 74

74

www.inbroadcast.com | NAB Show 22-27 April 2017 | Product Preview

Test Uncompressed Video in the
IP Domain Without Forsaking SDI
All-IP infrastructure will be the next great change in the video-delivery landscape,
writes Adam Schadle, Vice President of Video Clarity, and most operations are
thinking about how best to implement it...

S

taying ahead of the
competition means making
sure IP infrastructures will
work flawlessly once they're
deployed, and that means
testing new products that use
IP interfaces and standards to
ensure they will consistently
deliver high-quality content viewers
expect.
But even as IP continues to gain
popularity, SDI isn't going away
anytime soon, so you have to be
able to work with both during the
transition. The question is, how?
The answer is an appliance that
would let you not only test video and
audio quality in the IP domain, but
would give you the option to mix SDI
functions in the same system. Such a
system could capture from SDI or IP,
play back to or from SDI or IP, and -
once playback begins - simultaneously
record the output so the source and
downstream versions are aligned and
available for testing.
IP Applications
As developers and broadcasters
look to perfect their IP products and
infrastructures, there are several
possible applications for this type
of testing technology. For example,
equipment manufacturers who want
to accelerate the development of their
processing algorithms could use such
a system to do it. The system would
import a wide range of compressed
or uncompressed file formats,
record video and audio, or capture

to the downstream processed
version of the program from
an IP feed. Then automatic
alignment, visual inspection
and measurement functions
are applied.
Fig. 1: Processed VideoPath

a live stream from an IP network
and demultiplex it for decoding and
testing. From there the system could
automatically align the source and
downstream sequences, paving the
way for the analysis phase. In this way,
developers can compare performance
of algorithms, quantitatively or
subjectively judge them, and get
detailed test log reports.
ClearView IP
IP/SDI hybrid testing technology
exists today in Video Clarity's
ClearView IP, the newest member
of its ClearView line of video quality
analyzers and an all-new product
category for IP infrastructure use.
The system goes beyond the video
capabilities of a standard Gigabit
network and traditional SDI and HDMI.
Its interfaces are specially designed
to apply uncompressed video and
audio with certain time stamp and
packetized procedures that are specific
to the entertainment production,
postproduction, and delivery markets.
Designed
for
programmers,
broadcasters, and manufacturers of
broadcast products to use in their
video quality test labs, ClearView IP
plays or records up to two channels

of uncompressed video programming
from its built-in, high-capacity storage
into a network compliant to the latest
SMPTE standards. Critically, ClearView
IP can play while recording using
the new IP standards - an essential
function for being able to perform
quality testing in a new IP world.
ClearView IP works in a couple of
different ways:
1. It can either take in a recorded
file (such as a VOD or edited file) or
stream through its 10Gigabit Ethernet
interface. From there it will output
the source video through an encoder
that takes in 10 Gigabit and also puts
out a processed transport stream on
Gigabit Ethernet network. (See Fig. 1)
The Gigabit Ethernet encoder output
is then captured and decoded at the
same time. After the play-while-record
operations, the source video is aligned
with the processed version, both of
which are uncompressed video with
audio ready for visual comparison and
quality measurement.
2. Alternatively the system can capture live video from an uncompressed
or even compressed stream from a 10
Gigabit Ethernet source program and
at the same time, record from a decoder device or apply its internal decoder

Test Scenarios
Once content is captured, recorded,
and aligned, video engineers can
then use either automation or
straightforward desktop controls to
apply ClearView IP to various testing
scenarios.
They can perform highly accurate
quality measurements using several
viewing modes to compare original
with processed video in any format
their screens will allow. Importantly,
the quality measurements are
correlated to accepted scales of human
perception. These widely adopted
metrics yield perceptual quality
scores that, along with subjective
visual playback analysis features, help
engineers:
*	 Assess the progress of product 	
		development;
*	 Set encoding parameters for 	
		program delivery;
*	 Evaluate various encoders among 	
		multiple vendors.
So, whether you're blending IP
with SDI or building a new all-IP
infrastructure, you can test video
quality just as you did in the SDI
domain. And if you're already a
ClearView customer, you can do it
using a tool that's familiar to you.
www.videoclarity.com


http://www.inbroadcast.com http://videoclarity.com http://www.videoclarity.com http://videoclarity.com http://nab17.mapyourshow.com/7_0/exhibitor/exhibitor-details.cfm?ExhID=726

Table of Contents for the Digital Edition of In Broadcast - NAB SHOW 2017

In Broadcast - NAB SHOW 2017 - Intro
In Broadcast - NAB SHOW 2017 - Cover1
In Broadcast - NAB SHOW 2017 - Cover2
In Broadcast - NAB SHOW 2017 - 3
In Broadcast - NAB SHOW 2017 - 4
In Broadcast - NAB SHOW 2017 - 5
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In Broadcast - NAB SHOW 2017 - Cover3
In Broadcast - NAB SHOW 2017 - Cover4
In Broadcast - NAB SHOW 2017 - S1
In Broadcast - NAB SHOW 2017 - S2
In Broadcast - NAB SHOW 2017 - S3
In Broadcast - NAB SHOW 2017 - S4
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