InBroadcast - February 2022 - 47

www.inbroadcast.com | Vol: 12 - Issue 2 | February 2022
47
InStudio
In the Hybrid World of IP and SDI Mobile
Vehicle Production, Proper Timing
Is Crucial to Success
L
arge sporting events have always
been known for the multitude
of (OB) outside broadcast
required
trucks
to provide adequate
coverage. There's no such thing as a
second chance to get things right for
live events, so it takes an elite team
of
talented
broadcast
engineers,
operators, and production staff to
successfully setup and deliver these
complex programs to eager fans.
And
as
talented
doesn't
as
these
production teams might be, none
of it matters if the equipment in the
trucks
perform perfectly.
This is the realm of the broadcast
engineer, an unsung hero to many,
but without them, the broadcast
simply would not happen. The past
year saw a substantial
technology
shift as more IP-based OB trucks
were deployed than ever before.
NEP, a privately owned international
production company, and their
clients decided that IP-based trucks
would be responsible for creating
the primary
program feeds
last
year. That meant they would need
to synchronize the trucks using the
IEEE PTP (Precision Time Protocol)
standard.
This
ensured
throughout the events, all
production gear would
that,
remote
remain
precisely timed. The challenge was
that while some vehicles had IPinfrastructure,
several
trucks
used SDI and black burst or tri-level
synchronization methods. Therefore,
a hybrid approach was needed to
sync all trucks successfully.
Dan
Turk, Chief
still
line delay. We had to
deal with the Encap/
Decap (encapsulation/
decapsulation) process
delays when converting
signals between worlds and
tie the IP video timing into the
baseband world. "
For last year's events, about half
the trucks used the SMPTE 2110
standard for IP-video. The remainder
used
traditional SDI
video with
black burst or tri-level sync. Each
of the NEP IP trucks utilized two
Telestream Tektronix SPG8000a Sync
Pulse Generators
(SPGs) with an
ECO8000 automatic changeover unit
for redundancy. The Grandmaster
reference for all the trucks was
supplied by two SPG8000a's locked
to GPS in a custom made flypack.
In addition to acting as a timing
reference, the SPGs also generated a
wide array of video test patterns and
audio signals.
Unlike a fixed facility where timing
only be completed
need
and then periodically
broadcast
once
re-checked,
trucks must be setup
from scratch and timed out at each
new event. The technical
director
Engineer and
Vice President of NEP, recalls the
challenges of migration to IP. " For
years we've been building large
compounds with multiple vendors,
and originally had a couple of IP
trucks that were the early proprietary
versions
of
today's SMPTE 2022
technology, which included a fourand
the full crew must be on hand
during setup. The longer setup
takes, the more it costs. Everything
must be precisely timed, including
the DR (Disaster Recovery) systems
that are running in parallel. Setup
typically occurs a couple days before
an event when all the trucks arrive,
and the big job of cabling everything
together and testing signals begins.
Delays between trucks can only go
so far before the timing slips out of
the switch's window of tolerance. " If
you keep all the IP trucks in an island
at the top of the chain, then you can
time all the SDI trucks and facilities
to that, " says Turk. " Each truck signal
must be precisely timed because of
tri-level sync. " One of the reasons
NEP buys
the
SPG8000a
over
other options is because of
the holdover feature. It's
something that we
check
our
as
DR
Holdover Recovery
Telestream's
Tektronix SPG8000A
shared cameras and feeds. We also
used Telestream's PRISM Waveform
monitors to measure the timing for
each truck. "
In previous
part
workflow
at large shows. " The
feature has
been put to the test in the past and
everything stayed perfectly locked
until reference was restored.
" With a mixed compound of SDI
years, testing and
adjusting the timing could take four
hours or more. By using PTP and the
Telestream SPG8000a SPGs for both
grandmaster and internal
timing
reference in the trucks, the setup
was reduced to just one hour. " Timewise,
we saved about a half a day by
using the SPG8000a locked to GPS, "
comments Turk. " We had a small
learning curve on the way in, but it
all worked perfectly, and when we
actually did the test, everything was
correctly lined up and easier than
ever. " Turk and the NEP team plan
to use this configuration for every
major event with multiple trucks
going forward.
Should an SPG8000a lose its
external
GPS
or
reference,
the
patented Stay Genlock and Holdover
Recovery
algorithm can continue
to synchronize the IP-based trucks
locally until the reference is restored,
while the
Electronic
Telestream ECO8000
Changeover unit
using black
burst
can
automatically switch references for
the more sensitive analog based
systems
and
Telestream's
PRISM family
and IP trucks, there's still a need
to be able to swing in traditional
SDI-based trucks. This is done by
providing an individually adjustable
input to the SPGs in the SDI trucks
from the main system. Doing this
from the sync generator allows each
individual
truck to be adjusted to
match the entire compound. "
The NEP team has
relied
on
Tektronix scopes and SPGs for many
years, so the equipment was familiar.
Last year was the first time the
company used PTP as the backbone
to
implement
the
of
sophisticated
timing requirements that result from
working in a hybrid environment with
2110 and SDI trucks. " We can now
say we've tamed the PTP beast that
so many people find intimidating, "
concludes Turk. " This will be the plan
for all future compounds. "
To learn more about best practices
with PTP timing for outside
broadcasts click pic.
https://www.telestream.net
http://www.inbroadcast.com https://www.telestream.net https://www.telestream.net/video/sync-and-reference-generators.htm https://www.telestream.net/video/sync-and-reference-generators.htm https://www.telestream.net/video/sync-and-reference-generators.htm https://www.telestream.net/video/sync-and-reference-generators.htm https://www.telestream.net/video/sync-and-reference-generators.htm https://www.telestream.net/video/sync-and-reference-generators.htm https://www.telestream.net/video/sync-and-reference-generators.htm https://www.telestream.net/video/sync-and-reference-generators.htm https://www.telestream.net/video/solutions/PTP-timing-source.htm https://www.telestream.net https://www.telestream.net/video/prism.htm https://www.telestream.net/video/prism.htm

InBroadcast - February 2022

Table of Contents for the Digital Edition of InBroadcast - February 2022

Contents
InBroadcast - February 2022 - Intro
InBroadcast - February 2022 - Cover1
InBroadcast - February 2022 - Cover2
InBroadcast - February 2022 - Contents
InBroadcast - February 2022 - 4
InBroadcast - February 2022 - 5
InBroadcast - February 2022 - 6
InBroadcast - February 2022 - 7
InBroadcast - February 2022 - 8
InBroadcast - February 2022 - 9
InBroadcast - February 2022 - 10
InBroadcast - February 2022 - 11
InBroadcast - February 2022 - 12
InBroadcast - February 2022 - 13
InBroadcast - February 2022 - 14
InBroadcast - February 2022 - 15
InBroadcast - February 2022 - 16
InBroadcast - February 2022 - 17
InBroadcast - February 2022 - 18
InBroadcast - February 2022 - 19
InBroadcast - February 2022 - 20
InBroadcast - February 2022 - 21
InBroadcast - February 2022 - 22
InBroadcast - February 2022 - 23
InBroadcast - February 2022 - 24
InBroadcast - February 2022 - 25
InBroadcast - February 2022 - 26
InBroadcast - February 2022 - 27
InBroadcast - February 2022 - 28
InBroadcast - February 2022 - 29
InBroadcast - February 2022 - 30
InBroadcast - February 2022 - 31
InBroadcast - February 2022 - 32
InBroadcast - February 2022 - 33
InBroadcast - February 2022 - 34
InBroadcast - February 2022 - 35
InBroadcast - February 2022 - 36
InBroadcast - February 2022 - 37
InBroadcast - February 2022 - 38
InBroadcast - February 2022 - 39
InBroadcast - February 2022 - 40
InBroadcast - February 2022 - 41
InBroadcast - February 2022 - 42
InBroadcast - February 2022 - 43
InBroadcast - February 2022 - 44
InBroadcast - February 2022 - 45
InBroadcast - February 2022 - 46
InBroadcast - February 2022 - 47
InBroadcast - February 2022 - 48
InBroadcast - February 2022 - 49
InBroadcast - February 2022 - 50
InBroadcast - February 2022 - 51
InBroadcast - February 2022 - 52
InBroadcast - February 2022 - 53
InBroadcast - February 2022 - 54
InBroadcast - February 2022 - 55
InBroadcast - February 2022 - 56
InBroadcast - February 2022 - 57
InBroadcast - February 2022 - 58
InBroadcast - February 2022 - 59
InBroadcast - February 2022 - 60
InBroadcast - February 2022 - 61
InBroadcast - February 2022 - 62
InBroadcast - February 2022 - 63
InBroadcast - February 2022 - 64
InBroadcast - February 2022 - 65
InBroadcast - February 2022 - 66
InBroadcast - February 2022 - 67
InBroadcast - February 2022 - 68
InBroadcast - February 2022 - Cover4
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