In Broadcast - IBC 2015 - 24


24

www.inbroadcast.com | IBC2015 InShow Guide | 11-15 September

Unifying Traditional And
Multiscreen Workflows
Most linear television operations today include legacy video processing equipment
dedicated to specific tasks such as encoding, splicing and multiplexing...

A

s exciting new OTT and VOD
services offered by traditional
DTH providers gain popularity, video
providers are finding that legacy
hardware-based video processing
equipment cannot keep pace.
Support for content distribution
across most traditional pay TV
networks
requires
advanced
compression
and
statistical
multiplexing methodologies. Since
QAM bandwidth for delivering these
channels is fixed, one approach to
allocating bandwidth is to simply
divide the total available bandwidth
by the number of sub-channels and
then evenly allocate constant bitrate
(CBR) encoding levels. However, this
static allocation method is extremely
inefficient as bandwidth is equally
spread across simple and more
complex video scenes.
A more efficient method is to pool
together the available bandwidth
for several sub-channels and apply
active variable bitrate (VBR) encoding
per sub-channel in order to increase
overall picture quality and free up
bandwidth for the channels that need
it most at any point in time.
The Flexibility Of A
Software Approach
Video providers are able to quickly
scale up and introduce new features
thanks to the inherent agility of
software-defined video solutions which
are differentiated in part by the ability
to migrate changes and improvements
amongst different codecs such as

Bandwidth Savings in a Multi-resolution,
Multi-codec Mux Pool

MPEG-2 and H.264. This is not possible
with hardware-based solutions for
video compression.
For more aggressive unified headend
strategies, encoders can ingest 4K
UHD or HD content and transcode it
into parallel HEVC UHD and MPEG-2
or H.264 HD and SD streams, allowing
a single system to create multiresolution channel outputs from a
single source.
Support for multiscreen video
delivery requires software-based
solutions that are nimble enough to
accommodate rapid change while
simultaneously
maintaining
the
reliability required for 24/7 services.
To start, the evolution of streaming
protocols and monetisation strategies
for Over-The-Top services requires
an advanced origin server, such as
Elemental Delta, to perform just-intime packaging, streaming and DRM.
A
software-based
statistical
multiplexer also is necessary for
analysing
the
frame-by-frame
complexity of incoming video across
multiple sub-channels while a bitrate
controller sets the target bitrate levels
of each encoder so that their total
matches the full bandwidth available.
Elemental Statmux is a statistical
multiplexer designed to accommodate
current linear TV workflows with a
close eye on the future.
The addition of multi-resolution
support advances the idea of statistical
multiplexing by enabling new services,
including the creation of mux pools
containing UHD 4K channels along
with HD and SD channels, allowing
network operators to thoroughly
optimise bandwidth usage.
In contrast to most hardware-based
equipment, Elemental Statmux can

Elemental Statmux allows Simultaneous
Muxing for Ultra HD, HD and SD

Elemental Statmux Architecture

potentially operate as part of a linear
TV solution embedded within the
encoder or as a standalone system,
requiring minimal rack space and
easily duplicated to a standby system
for full redundancy.
Full-System Redundancy
For Maximum Up-Time
In traditional linear TV deployments,
failures were historically limited to
a single channel because a single
hardware encoder was used for each
individual channel.
With
software-defined
video
processing, linear TV processing,
network and storage resources can
be dynamically provisioned for video
encoding, muxing, and other linear TV
delivery functions. Service upgrades,
channel line-up changes and system
maintenance tasks can be performed
without any downtime by switching live
functions over to redundant hardware
or virtual machines. Elemental
software runs on Linux and has been
deployed by more than 600 Elemental
customers. The Linux operating system

Input, Node and Output Redundancy for
Each Component in the System

eliminates the need for the occasional
restarts required by Windows solutions
while simultaneously reducing the
deployment time for spinning up
additional software-based nodes.
Advanced Configuration
And Node Management
Elemental Conductor management
software offers the features and
functionality required by pay TV
operators for live workflows. New
capabilities such as bulk actions that
allow multiple channels to be stopped,
started and edited simultaneously
simplifies management of hundreds of
channels while ensuring configurations
are synchronised. The combined
capabilities
of
template-based
channel configuration and secure
authentication capabilities provide
confidence that all channels are
configured with the desired settings by
authorised users.
Conclusion
Software-defined video encoding,
multiplexing, and system management
can enable operators to extract
additional
capacity
from
their
networks, increase the QoS, and
reliability of linear TV delivery
networks
through
full
system
redundancy, simplified workflows
and advanced configuration options.
Elemental video solutions can
integrate both linear and OTT video
delivery within a single unified
workflow.


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In Broadcast - IBC 2015 - Cover3
In Broadcast - IBC 2015 - Cover4
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