[opendtv] Re: Digital programe insertion In IPTV environments
- From: Prashant Desai <prashant.desai@xxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Thu, 03 Feb 2005 13:51:46 +0530
Hello ALL
thanks a lot to entire list for clarifying the DPI part of IPTV , its
indeed helped me a lot
to understand the same and different possibilities for the same
warm regards,
Prashant Desai
----- Original Message -----
From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
To: "OpenDTV (E-mail)" <opendtv@xxxxxxxxxxxxx>
Sent: Wednesday, February 02, 2005 11:15 PM
Subject: [opendtv] Re: Digital programe insertion In IPTV environments
> Prashant Desai wrote:
>
> > How the Ad insertion is typically handed in case
> > of IPTV broadcast TV channel scenerio ?
> > what i know in this regard is there are some
> > singnals called cue tones using which the the
> > system can rekon that it's time to insert localized
> > content and so based on cue tone it switches the
> > input of the system , but what i would like to
> > know is does it happen before the content gets
> > convered for IP environments or it happens before
> > this digitalization of content
>
> I don't know about "typically," and from what I've
> read, there are many industry-wide standard
> techniques for IPTV yet, but ad insertion ought to be
> easier with IPTV than without.
>
> There are many options here. One simple one is that
> the TV viewer goes to an electronic programming guide
> (EPG) to find the choices (live or VOD programs).
> This would be a TCP/IP session with a server. When
> the viewer makes a selection, it is provided with two
> multicast addresses: one for the program stream and
> one for the ads.
>
> Since that was a TCP/IP session, the server is aware
> of the identitity of the viewer, his preferences, and
> interests. The server knows this because that viewer
> is a subscriber, and had to anwer all those questions
> previously. So the ad multicast group sent to that
> viewer as part of this TCP/IP session is geared to
> his interests.
>
> Now, armed with those two multicast addresses, the
> viewer sends "IGMP reports" to the edge router, to
> join simultaneously both multicast groups. (See
> RFCs 2236 or 3376 for descriptions of IGMP.)
>
> At the transmission side, during the commercial
> break, the "main program" multicast packets can
> stop flowing entirely, and a number of different
> ad multicasts are launched. Viewers only see the
> stream that belongs to their ad multicast group.
>
> There are other ways you can do this. For example,
> using Session Description Protocol (RFC 3266) and
> Session Announcement Protocol (RFC 2974). Possibly,
> program and ad multicasts can be described and
> announced periodically, and IPTV clients join
> without having to go through any session with the
> EPG server.
>
> Bert
>
>
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