eng TELE-audiovision 1411

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video quality than the video signal prior
to MPEG-4 compression. DVB-T, DVB-C
or DVB-S2 receiver – you name it. Playback
without artefacts or interruption
was a given at all times.
Conclusion
The CW-4412 always does exactly
what it is supposed to: It compresses
different video and audio signals from
various inputs (composite video, component
video, SDI und HDMI) to the
two discrete encoders and creates an
MPEG-4 Part 10 transport stream. All
this is done in real-time without significant
latency. The compressed transport
stream is made available via ASI and
IPTV at the same time.
We put the encoder to the acid test
over a course of six weeks and even
though we never spare time or effort,
we could not prompt the CW-4412 into
any faulty behaviour. If power supply
is interrupted the device gets back to
business in less than three seconds and
with all previously set parameters still
in place. Manual intervention is not required.
The user interface is self-explanatory
and can be accessed from any web
browser. This way the CW-4412 is very
easy to set up and control. The new
web-based front-end does not only allow
access from different operating
system, it also adds a high level of userfriendliness
to the whole process.
Added to that are a lot of small tricks
and treats such as tailoring the MPEG-4
format right down to the last detail, or
triggering an e-mail alert in case something
goes wrong.
We can wholeheartedly recommend
the CW-4412. CableWorld has truly
whizzed up a remarkable treat. Whenever
real-time video compression into
MPEG is the order of the day, the CW-
4412 (or any other member of the CW-
4XXX family for that matter) is the encoder
of choice.
Great to know: Even if you don’t (yet)
own a CableWorld product, it’s still a
smart idea to download the TS Analyser
SW-4811B application. It doesn’t
cost a thing, yet is priceless when it
comes to thoroughly analysing transport
streams.
SW-4811
44. The Visual Tester tab will render the
actual video and audio. In case of MPEG-4
you need to provide your own CODEC,
though. Here I was testing the MPEG-4
output of the CW-4412 which was fed with
the composite video signal of a professional
MPEG-2 IRD.
45. The SW-4811 application includes a TS
Recorder and TS Player tab, allowing to
record and manage Transport Streams.
46. Finally, the Real Time tab allows to
render a graph relating the bit rates of the
streams over time.
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34 TELE-audiovision International — The World‘s Leading Digital TV Industry Publication — 11-12/2014 — www.TELE-audiovision.com