Re: TV Back Channel

From: Michael A. Dolan (miked@tbt.com)
Date: Wed, May 17 2000

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    Message-Id: <4.3.1.0.20000517152307.00d0af00@cts.com>
    Date: Wed, 17 May 2000 15:25:20 -0700
    To: www-tv@w3.org (WWW TV List)
    From: "Michael A. Dolan" <miked@tbt.com>
    Subject: 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