This is an important point: The MPEG-2 specification covers all sorts of things besides compression. Fortunately, we can use a portion of the MPEG-2 specification to multiplex JPEG-2000 ES and AES audio into a single MPEG-2 Transport Stream (TS) in a standardized way. Using MPEG-2Īs mentioned earlier, the JPEG standard says nothing about audio. The audio at the side of the truck is already an AES stream. The video out of the truck is compressed using J2K, resulting in something called a JPEG 2000 Elementary Stream (ES).
#J2k compression professional#
We start with live professional video and audio - perhaps the output of a sports production truck. Let’s look at a specific example - the transport of J2K with audio over IP - to see how a layered approach is applied in a working scenario.įigure 1 shows the protocol stack used in this case. The header contains information that is used to perform functions associated with that layer of the network functionality, and the payload section contains the information we want to transport across the network. Packetized networks use packets composed of a header and a payload section. If you remember from last month’s article, we said that one of the keys to networking is layering and encapsulation. Thanks to this, megabit and now gigabit networking has become available on long-haul networks - at surprisingly reasonable prices in some cases. The boom was followed by a bust, but the fiber was already in the ground. During the dot-com boom, tens of thousands of miles of fiber optic cable were installed all over the country.
As a result, in the 1980s, satellite became the dominant long-haul technology. In the 1960s, AT&T launched communications satellites, and AT&T and other satellite operators added video capability to these platforms over time. This was an RF-based analog system that remained in place for many years. In the 1950s, AT&T (note the capital letters - we are talking about the old telephone company) built a nation-wide, terrestrial, video network for the big three networks.
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