InBroadcast - InReview 2022 - 27

www.inbroadcast.com | Vol: 12 - Issue 12 | InReview 2022
27
The Right Multiviewer for
Replay and VAR systems
W
orking with
With Igor Vitiorets, CTO at slomo.tv...
video signals
implies monitoring the video
images. There are many reasons for
this: from checking the connection
and signal
quality
to monitoring
events in the video.
When dealing with only one signal,
everything is quite simple: a video
monitor is installed, which displays
the input video signal. It is much
more complicated when there are
6, 8, 16 or even more video signals.
Installation of a dedicated monitor
for each signal becomes impractical
and requires a lot of space. A device
called
Multiviewer solves
problem.
Multiviewer for
multiple channels
The Multiviewer receives
signals, processes, scales
this
InStudio
video
and
arranges them and outputs them
to one or more
video monitors,
depending on which Multiviewer is
used.
Multiviewer is a must-have for
systems with multichannel recording
functionality. There are at
least 3
types of such systems: recording for
NLE servers, video replay servers,
and Video Assistant Referee (VAR)
systems.
Simple systems
often use an
external Multiviewer to display input
video signals, but all professional
systems, including the EVS, GVG
and slomo.tv servers, have a built-in
Multiviewer subsystem. The slomo.tv
servers even have two completely
independent
Multiviewers: one
integrated into the main interface and
one running on a separate monitor.
The signals
of
recording systems can be divided
into two types: live and recorded. The
Multiviewer of such systems must
process both types of signals.
A standard replay server records
live signals, plays back one channel
(Program), and allows an operator to
work with one recorded channel for
search and markup of clips (Preview).
Thus, a standard replay Multiviewer
displays all live signals, Program and
Preview.
Multiviewer requirements for VAR
systems are different. The referee's
workplace must allow simultaneous
multichannel
viewing and
searching of 2-4
channels.
In this case, in addition to the
usual Multiviewer with at least all
live signals, it is appropriate and
useful to display all recorded signals
in the search mode during the review
of a game moment.
This
allows
the referee to instantly select the
desired cameras for viewing. In VAR
systems, the referee's monitor is also
a Multiviewer with 2-4 or more video
windows, both in Live and Recorded
mode when reviewing the moment.
Flexible layout of the video signals
is also a must-have feature of the
Multiviewer. For example, large
Program and Preview windows and
scaled-down video windows for the
input signals.
Since modern servers
with
multichannel recording functionality
allow connecting a large number
of cameras, the Multiviewer must
be able to process a corresponding
number of live and recorded signals.
A hardware-based
Multiviewer
limits the number of simultaneously
displayed
video windows, while
in a software-based Multiviewer it
depends only on the level/quality of
the software and the performance of
the server.
Main requirements
for a Multiviewer
To summarize, a good Multiviewer
works with a large number of live
and
recorded
channels, available
simultaneously. The system should
Camera presets
At the events with multiple focus
points, such as track and field events,
the operator works with a different set
of cameras at different points in time.
If 4 cameras are used for the high
jump and 6 cameras are used for the
hurdles, the operator does not need
to see all channels when preparing
a replay of the high jump. It distracts
and slows him down.
A professional Multiviewer system
should be able to flexibly create
and
configure
views
of
switch
different
camera sets, camera layouts and
video window sizes, while allowing
the operator to instantly
them, preferably using the Replay/
VAR control panel. In the described
scenario the operator sees on the
Multiviewer only PGM, Preview and
4 live/recorded channels from the
high-jump sector, but has the ability
to quickly switch to the 6 cameras of
hurdling. The number of Multiviewer
presets should cover all tasks.
be able to create flexible display
and layout camera presets as well
as quick switching between them.
A separate HDMI, DP or SDI output
for the Multiviewer is mandatory for
servers with a built-in Multiviewer.
Multiviewer in slomo.tv systems
Simultaneous
search on all
channels is slomo.tv's unique feature.
It simplifies and speeds up work with,
for example, 15 channels of the VAR
system or eSports. The Multiviewer
subsystem of the slomo.tv servers
has the ability
to simultaneously
display all live channels, all recorded
channels in search mode, PGM and
Preview. Thus, a 15 channel system
outputs a Multiviewer with 32 video
windows.
In slomo.tv VAR solutions, a monitor
with touch screen function is installed
at the referee's workplace, which
displays the referee Multiviewer.
This allows it to be used for channel
selection and
search without
operator's assistance.
Also, the specialized Multiskin
function allows switching between
interfaces and presets. The operator
can quickly
select
operation mode.
https://slomo.tv
the needed
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