In Broadcast - March 2020 - 24

24

www.inbroadcast.com | Vol: 10 - Issue 3 | March 2020

InMedia

Content Delivery Networks
As online video viewing surges, so have consumer expectations for a high-quality viewing
experience. Contributing Editor Adrian Pennington notes that CDN vendors play a key role
in enabling you to bypass internet congestion...

C

ontent delivery network (CDNs)
will play a central role in the
transformation of TV. As we watch more
content on more devices, spend on
CDN services to deliver video over the
open internet will near US$16 billion by
2023, according to Ovum. CDNs will be
critical to ensuring streams start fast,
play buffer-free and generally meet
consumers' increasingly high standards
as demand scales.
The problem is that with the
increasing number of new streaming
services, there will be even more video
traffic originating from a handful of
sources. In the end, the quality of the
user experience will depend on aspects
such as how crowded the CDN caches
and streaming servers are, how and
where the streams got into the ISP,
the capacity of the core network, what
kind of access network is used and
how many users are sharing the same
connection? Since all the big streaming
services are relying on the same,
to a large extent shared best-effort
infrastructure, they will impact each
other.
Limelight says its video delivery
offers the lowest rebuffer rates in
the industry. It also has one of the
world's largest networks boasting 70+
Tbps egress capacity and a 100GbE
private fibre backbone connected
to more than 1000 ISP and last-mile
networks. It has 130 PoPs "unlike other
cloud solutions that may restrict your
presence to a handful of datacentres."
Limelight's CDN service continually
monitors and optimises video delivery
based on real-time conditions.
Limelight MMD-OD and MMD-Live
provide on-the fly packaging of ondemand and live video content that
makes it easy to reach viewers on any
device.
Charlie Kraus, Senior Product
Marketing Manager, says: "To maintain
consumer expectations for multidevice viewing, it's important to have
a CDN with the capability to do device
detection and automatically optimise
picture quality for each viewer's
device, available bandwidth and
network conditions."
Origin failures occur when a server
is overwhelmed with requests, due

to congested networks or other
unexpected events. These failures can
keep origin responses from getting
back to the client; hence, the need for
redundant server architectures.
Akamai's solution is Origin Failover
for its Adaptive Media Delivery (See
Fig.1) product to make it easier to
detect and recover quickly from
such failures. Origin Failover offers a
self-service solution for maintaining
continuity of playback in the event of
an origin failure.

Fig.1: Akamai Origin Failover

It is designed to identify origin and
network issues before they extend
to the client, helping to reduce the
likelihood of a rebuffer event during
a failure. By detecting issues as close
to the origin as possible, this reduces
the time to recovery by failing over
before the client-side player detects
an issue. In turn, this minimises impact
to playback performance in terms of
rebuffering during failures.
According to Ovum, the ability to
analyse and manage multiple CDNs to
deliver the best quality experiences
for the best possible cost will be an
important strategy for OTT providers.
The big question is: how can they
take back control of their TV delivery
without going down the client
integration route?
"Many technology providers claim to
provide low-latency video streaming
solutions, by reducing the player
buffer size without optimising the
network. Yet, the performance of
these solutions is in a lab setting, so

CDN and TV Everywhere - Broadpeak

they don't account for jitter on realworld networks or the succession of
rebufferings that can occur, which
impacts QoE," says Jacques Le Mancq,
CEO at Broadpeak.
Broadpeak has joined forces with
encoding expert ATEME to resolve the
issue. The solution combines ATEME's
content adaptive encoding tools with
Broadpeak's BkS350 Origin Server
and Packager, BkE200 transcaster
server, and nanoCDN. While Akamai,
Synamedia and Velocix also have their
own Multicast ABR (MABR) solutions,
the nanoCDN is claimed as the only
technology around that combines
multicast delivery with CMAF and HTTP
CTE, allowing continuous (on-the-fly)
video delivery. The solution supports
the emerging DVB-I standard.
Briefly summarised, MABR allows
for the distribution of one physical
copy of video content to all users in
an ABR format (DASH and HLS) via
multicast rather than HTTP individual
connections. "The fact is that MABR
does
actually
save
bandwidth
compared with unicast," declare
Broadpeak.
Broadpeak
also
offers
the
umbrellaCDN, a concept allowing
content providers to create CDN
selection rules based on parameters
such as user location, content
requested and time of the day. A CDN
Diversity feature takes advantage
of the capacities of several CDNs at
the same time. This not only has the
benefit of in-built redundancy but
delivers a video quality claimed to
exceed that of a single best effort CDN.
The Vualto Control Hub also
uses event-based scheduling to
organise live streams, to automate
the provisioning of infrastructure
according to user-defined parameters.
The origins, encoders and other
infrastructure
components
can
be built, installed and configured
automatically before an event is

scheduled to start, all tied into the
monitoring already available in the
orchestration and delivery tool.
The latest feature allows for the
configuration of a live stream for use
by multiple end users, on multiple
devices, with multiple subscriber
conditions. "The VCH enables you to
be in complete control of the tracks
you select," Vualto explains. "You
select the tracks that you want to
present from a publishing point, under
different playout manifests."
While StreamGuys may be best
known for helping radio broadcasters
and podcasters deliver premium audio,
the company has been expanding its
video streaming tools and services.
"We are essentially a one-stop shop
for live video streaming at enterprise
scale," explains Eduardo Martinez,
Director of Technology. "Customers
can send us a high-quality, singlebitrate feed, and we can repurpose
it as necessary and act as an origin
for efficient delivery to many
destinations. By offering this as a
managed service, we spare customers
from having to manage and maintain
a multitude of encoders and servers,
as well as reducing their bandwidth
requirements to just a single stream
out of their facility."
StreamGuys' supports SRT (Secure
Reliable Transport) for both ingest
and output with current or upcoming
support
for
ultra-low-latency
technologies including WebRTC, lowlatency CMAF and Softvelum's SLDP.
The latter is directly supported in
StreamGuys' embeddable,

Vualto TV streaming


http://www.inbroadcast.com https://broadpeak.tv/ https://www.akamai.com/uk/en/ https://www.vualto.com/

In Broadcast - March 2020

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In Broadcast - March 2020 - Intro
In Broadcast - March 2020 - Cover1
In Broadcast - March 2020 - Cover2
In Broadcast - March 2020 - Content
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In Broadcast - March 2020 - Cover3
In Broadcast - March 2020 - Cover4
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