In Broadcast - NABSHOW 2015 - 8


8

www.inbroadcast.com | NAB SHOW 11-16 April 2015 | InShow Guide

Subtitling and Transcoding
with Cavena

Subtitling is a way of getting a better end user experience, and is mainly used to
make foreign language material accessible and to aid hearing impaired people.
How Does Subtitling Work?
Subtitling comprises of two stages -
preparation and transmission.
The preparation of the subtitle files,
along with the time code required to
synchronise the subtitle with the video,
is done ahead of transmission. These
are delivered to the transmission site
in a format defined by the broadcaster,
and stored until it is time for
transmission. Preparation of subtitles
is the work of a craftsman, which takes
years to learn. It includes a high level
of language skills, and a good eye for
the in and out times of each subtitle
row.
Subtitle
transmission
is
an
automated process. The equipment
interfaces with broadcast station
planning and automation systems,
enabling it to receive programme and
trigger information. The transmission
units then synchronise the subtitles
for playout, using the video playout

timecode. Subtitles are output, in
suitable formats, on the transmission
platform. For the end viewer it can be
in the format of open captions, always
visible or closed captions (CC), which
gives the viewer a choice of seeing
subtitles or not. There are examples
of operators in Asia with the choice of
eight different subtitle languages for
one video, using the DVB standard.
Trends In Subtitling
More and more transcoding is
required, because programmes are
distributed on multiple platforms. In
layman terms, what comes in goes
out. An example of transcoding can
be reading subtitles in VBI format and
instantaneously converting and resending subtitles in DVB format, with
no dependence on timecode. Cavena
flexible solutions for transmission can
switch between timecoded subtitle
file playout and transcoding from one

subtitling format into another. Live
subtitling is also supported.
Another
growing
market
is
Audio Description. It is a growing
requirement for broadcasters to meet
the needs of visually impaired people,
who still want to watch and follow TV
programmes. Cavena has developed
a text to speech audio description
solution, which incorporates the
flexibility and cost advantages of
subtitling. Audio Description can be
either a narrative voice or spoken
subtitle texts, the technology is the
same.
The Cavena solutions are modular
and flexible, independent from
hardware, and different formats, and
new outputs can be easily added.
Lately, the streaming format SRT has
been requested by many operators.
Henrik Moberg, visionary Managing
Director of Cavena, says, "Cavena
has been committed to deliver

Henrik Moberg
Managing Director, Cavena

robust subtitling solutions for over
25 years. Cavena's world-leading
solution of subtitling is under constant
development together with strategic
partners.
"We also assist OTT solutions, both
integrating with streaming vendors
and standalone solutions."
Please do not hesitate to contact us for
more information: www.cavena.com


http://www.inbroadcast.com http://www.cavena.com http://www.cavena.se/ http://www.cavena.se/ http://www.cavena.se/

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In Broadcast - NABSHOW 2015 - Cover3
In Broadcast - NABSHOW 2015 - Cover4
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