Re: TV Back Channel

One of us is confused.  This is meant to carry video and audio, not DMSCC 
and SI as the original question posed.  As I said, I suppose it could, but 
noone is doing it, including Cisco.

I'm on vacation, but maybe I'll try to address this in more detail when I 
return in June...

At 02:33 PM 5/15/00 -0400, M. Reha Civanlar wrote:

>RFC 2250 (http://www.ietf.org/rfc/rfc2250.txt?number=2250) describes how to
>transport MPEG-2 over IP.
>
>At least one commercial product that implements this is Cisco's IP/TV
>(http://www.cisco.com/warp/public/cc/cisco/mkt/video/.)
>
>RTSP can be used to implement "VCR-type" functions and program selection in
>VoD. The latter can be accomplished in many other ways (SAP, SIP, HTML,
>etc.) also.
>
>----------------------------------------------------------------------------
>----------
>M. Reha Civanlar
>Division Manager, AT&T Labs - Research
>100 Schultz Drive, 3-215, Red Bank, NJ 07701, U.S.A
>Ph: +1 732 345 3305
>Fax: +1 732 345 3033
>civanlar@research.att.com
>http://www.research.att.com/info/mrc
>
>
>----- Original Message -----
>From: "Michael A. Dolan" <miked@tbt.com>
>To: "Martin Spamer" <martin_spamer@kingston-comms.co.uk>
>Cc: "'Venkatesh D N'" <venkatesh.nag@wipro.com>; <www-tv@w3.org>
>Sent: Monday, May 15, 2000 2:11 PM
>Subject: RE: TV Back Channel
>
>
> > Martin-
> >
> > RTSP is the session control protocol only and doesn't specify how to carry
> > anything.
> >
> > And, it is not meant to even control complex MPEG-TS streams, including
> > DSMCC carousels, PSI, etc.  It was really designed for program or
> > elementary streams, not transport packets.  It certainly *could* be used
>to
> > control them I suppose, but I'm not aware of anyone doing this.
> >
> >          Mike
> >
> > At 05:56 PM 5/15/00 +0100, Martin Spamer wrote:
> > >         -----Original Message-----
> > >         From:   Venkatesh D N [SMTP:venkatesh.nag@wipro.com]
> > >         Sent:   Thursday, May 04, 2000 4:50 AM
> > >         To:     www-tv@w3.org
> > >         Subject:        TV Back Channel
> > >
> > >         Hi,
> > >
> > >         I would like to know if there are any specifications for
> > >transmitting
> > >         MPEG-2 stream over TCP/IP ??
> > >
> > >YES, RTSP is designed to do this, you can find a copy at
> > >http://www.normos.org/rfc/rfc2326.txt
> > >
> > >         This would be required, for making a TV interface with the
>Internet.
> > >For
> > >         exmaple, if the user wants
> > >         to download a program stored in some "Content Server" based on
> > >DSM-CC,
> > >         then this MPEG-2 stream
> > >         has to be transported as payload in  TCP/IP packet.
> > >
> > >There are a number of proprietary Video on Demand Solutions from
>companies
> > >such as NCube and Oracle which do this.
> > >
> > >         How this is achieved
> > >
> > >Answering that question properly is way beyond the scope of this mailing
> > >list.  I suggest that If this is other than an idol question, your
> > >organisation needs to recruit an experts in these fields.
> > >
> > >         ?? Similarly if the user clicks
> > >         on a URL that is broadcasted on TV during an advertisement
> > >
> > >The Broadcaster would have to specially encode the URL into the video
> > >stream, or the STB would require some very clever character recognition
> > >software, at the moment this is not a realistic prospect, to do this
> > >currently your talking a serious hacks.
> > >
> > >         or as part of
> > >         some program, then in order
> > >         to access the WEB, there need to be mechanism to access the web.
> > >
> > >This would need to be designed into an STB from the beginning.
> > >
> > >         Are
> > >         there any proposals for achieving
> > >         these functionalities ???
> > >
> > >Yes, but not here this group is only concerned with the broadcast model.
> > >
> > >         What are the basic protocols apart fromTCP/IP that would be
>required
> > >for doing
> > >         this ????
> > >
> > >         If any of you know answers to my questions please let me know.
> > >
> > >         Best regards,
> > >         venkatesh
> > >
> > >
> > >Martin Spamer
> > >Senior Software Engineer
> > >Kingston Vision LTD
> > >Phone +44 (0) 1482 602 670
> > >Fax +44 (0) 01482 602 899
> > >E-Mail martin_spamer@kingston-comms.co.uk
> > ><mailto:martin_spamer@kingston-comms.co.uk>
> > >http://www.kingston-vision.co.uk/ <http://www.kingston-vision.co.uk/>
> >
> > ------------------------------------------------------
> > Michael A. Dolan, Representing DIRECTV,  (619)445-9070
> > PO Box 1673 Alpine, CA 91903        FAX: (619)445-6122
> >
> >

------------------------------------------------------
Michael A. Dolan, Representing DIRECTV,  (619)445-9070
PO Box 1673 Alpine, CA 91903        FAX: (619)445-6122

Received on Wednesday, 17 May 2000 18:23:11 UTC