[opendtv] Re: TV Technology: Korea to Launch ATSC 3.0 Broadcasts in 2017
- From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
- To: "opendtv@xxxxxxxxxxxxx" <opendtv@xxxxxxxxxxxxx>
- Date: Thu, 25 Feb 2016 02:06:14 +0000
Craig Birkmaier wrote:
How is this possible?
Yes, Craig, I predicted that you would get confused by this. Everything depends
on understanding the subject within a context.
Read RFC 6726. It describes a scheme called FLUTE: File Delivery over
Unidirectional Transport. This isn't the IP you use on your PC, Craig, although
I'm sure it could be installed.
In short, to permit this one-way pipe, FLUTE does what MPEG-2 TS also does. It
defines its own overhead, and for synchronization, may identify any number of
pre-defined techniques. FLUTE also provides for a choice of FEC algorithms. And
in order to allow "extensibility," FLUTE requires that hosts be updatable by
For example, quoting:
"It is envisioned that these parameters would be described according to some
session description syntax (such as SDP [RFC4566] or XML based) and held in a
file that would be acquired by the receiver before the FLUTE session begins by
means of some transport protocol (such as the Session Announcement Protocol
(SAP) [RFC2974], email, HTTP [RFC2616], SIP [RFC3261], manual preconfiguration,
etc.). However, the way in which the receiver discovers the above-mentioned
parameters is out of scope of this document, as it is for LCT and ALC. In
particular, this specification does not mandate or exclude any mechanism."
I told you many, many, many times that IP overhead can be added for one-way
broadcast pipes. But much of it is wasted, or merely reinvents what MPEG-2 TS
already allows. Did I ever say this was impossible?
So, leaving nonsensical hype aside, it's also possible to receive an IP stream
and convert it, in real time, to ATSC 1.0, and then broadcast. Happens all the
time in live news items that include Skype sessions.
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