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lows technicians to intervene<br />
whenever it is necessary to<br />
adjust the bit rate to specific<br />
or unexpected scenarios –<br />
even right in the middle of<br />
a broadcast. Thumbs up for<br />
that!<br />
Latency<br />
If an MPEG encoder is used<br />
for continuous operation to<br />
process a signal in real-time<br />
the achieved video quality is<br />
one deciding factor, but the<br />
other major aspect is the<br />
time delay that is caused by<br />
the compression process.<br />
It goes without saying that<br />
29<br />
Advanced Settings<br />
28. To configure the encoder, you start by selecting the correct<br />
input source. Sources with embedded audio can be configured<br />
to use an alternative analog audio source, which can make life a<br />
lot easier. Small features like this make the CW-4412 a joy to work<br />
with.<br />
29. In order to avoid any mistake or problem, you should manually<br />
specify the input format. I would not want to trust an automatic<br />
format recognition – problems could arise when you least expect<br />
them.<br />
30. Depending on the selected input format, you can toggle between<br />
different output formats. The rule is simple: you can down<br />
convert a resolution, but you cannot upscale, which would require<br />
completely different hardware and has dubious results, anyway.<br />
But the fact that the CW-4412 is able to down convert, makes all<br />
the difference: how else would you handle for instance an HDMI<br />
video signal in Full HD from a PC, which is to be broadcasted as a<br />
SD channel?<br />
31. Though MPEG-4 Part 10 is an established format, which should<br />
be supported by any decoder, it is sometimes necessary to fine<br />
tune the video GOP structure, video profile and video level to<br />
obtain best results for certain MPEG-4 decoder chipsets. Again,<br />
CableWorld did not make any compromise and allows these configurations<br />
to match the installed receiver platform. This makes the<br />
CW-4412 a versatile professional equipment.<br />
32. Audio is naturally compressed according to MPEG-1 Layer<br />
2 and as expected the CW-4412 allows a wide selection of all<br />
common audio bitrates. It also supports AAC.<br />
33. Now here is another amazing feature: if you are using the SDI<br />
video input with separate analog audio input, then you can adjust<br />
the audio volume – separately for the left and right audio channel.<br />
34. Setting up the IP streaming functionality offers the complete<br />
range of modes: Broadcast, Unicast and Multicast. Additionally,<br />
you can select the stream to a specific MAC address.<br />
35. No compromise in the UDP payload format: all options are<br />
available.<br />
36. And you can configure the UDP payload size to your exact<br />
requirement.<br />
37. You want to spend your time with other tasks and therefore you<br />
would like to receive an automatic e-mail from the CW-4412 in case<br />
something happens? No problem - just setup the relevant data.<br />
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30<br />
31<br />
28 <strong>TELE</strong>-<strong>audiovision</strong> International — The World‘s Leading Digital TV Industry Publication — 11-12/2014 — www.<strong>TELE</strong>-<strong>audiovision</strong>.com
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