The adaptation and adoption of IT systems for broadcast use is governed by a number of motivations; in this series of posts I hope to talk about (nearly) all of them.
The first is bandwidth. In broadcasting data streams often have fixed bandwidth. For example, HD-SDI has a bandwidth of 1.485 Gbit/s, if the encoding process doesn't actually need all the bits then it just fills to stream with filler data, which serves no purpose except to keep the data stream fixed. This is obviously wasted bandwidth, so in some systems (especially in IT) there is a variable bandwidth. In fact, when a PC is turned off, the cables that connect it to a router are pretty much empty.
In broadcasting a variable bandwidth can be used. For example, when applying compression, a frame showing a plain wall will require less data to encode that a frame showing a complex flower bed. So the spare bandwidth could be used for something else, like sending meta data.
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