- From: Huckins, Jeffrey <jeffrey.huckins@intel.com>
- Date: Thu, 9 Jul 1998 08:40:21 -0700
- To: "'tommi.riikonen@mnt.nokia.com'" <tommi.riikonen@mnt.nokia.com>, Phoschka@aol.com, www-tv@w3.org
Philipp, Do we yet have any idea whether or how this effort in W3C will move forward? Regards, Jeff Broadcast Architecture Intel Architecture Labs Intel, Corp. jeffrey.huckins@intel.com 503.264.9488 On Thursday, July 09, 1998 6:52 AM, tommi.riikonen@mnt.nokia.com [SMTP:tommi.riikonen@mnt.nokia.com] wrote: > > Hi Philipp and all others, > > Thanks for organizing the workshop on very important issues. It is really > important to get standards for accessing the TV-related services from HTML > and some kind of profile for broadcast HTML. W3C's active role in > participating these issues is definetly needed to get things going on and > standardized. > > Answers and comments: > > > From: EXT Phoschka > > To: www-tv > > Subject: Workshop feedback sought > > Date: 6. Julyta 1998 9:53 > > > > Technical review > > ---------------- > > > > The following topics had high priority: > > > > 1. New URL-scheme for TV channels [high] > > (new URL for content in TV services) > > broadcast-specific data on the Web (SI/PSI-like metadata: > > schedule, etc.) > > 6. interaction mechanisms for streaming media, linking [10] > > 7. controlling streaming media [6] > > URL-scheme for pointing to broadcast services is needed. So, not only a > pointing mechanism to TV channels but a wider concept is needed. > Dan's television URL is targeted only for changing the TV channel from HTML > and as such it might be hard to expand for more common use. > > It is not W3C's task to define the URL-scheme's name, but we can can give > valuable input what should the structure look like and what attributes or > parameters are needed. One starting point is to take the DAVIC's DVB URL > specification as a base and then extend it to fullfill our needs. (I am > talking > now about digital TV/broadcast services, but maybe a mechanism to tune or > switch to analog TV channels is needed too) > > The following content types are accessible via the DVB URL: > * Audiovisual broadcast services in DVB Transport Streams > * Files in DVB Data Carousels > * File objects in DVB Object Carousels > * Stream objects in DVB Object Carousels > > Part 9 of the DAVIC 1.3 specification (http://www.davic.org/DOWN1.htm) > defines the DVB URL syntax as follows: > > dvb://<original_network_id>.<transport_stream_id>[.<service_id>[.<component_ > tag>][;<event_id>]][/<...>] > > The <original_network_id>, <transport_stream_id>, <service_id>, <event_id> > and <component_tag> are the values represented as hexadecimal strings > without any "0x" prefix (for example, "4d2e"). > > Depending on the service the following part of the URL ("/<...>") may > contain a more detailed specifier that identifies the desired part of the > service. For example, if the service contains a data carousel, the last part > of the URL may contain the file name. > > Any DVB service containing audio and/or video components can be accessed via > the DVB URL. The service is uniquely identified by the DVB SI parameters > original_network_id, transport_stream_id and service_id. A data component in > a DVB service can also be accessed, provided that the data component is > either a Data Carousel or an Object Carousel. > > ** > > Pointing from web HTML content to broadcast stream is also a needed > feature. > In the broadcasted SI/PSI data there is no possibility to transmit very > large and > content rich (e.g. lots of images, texts video clips) data. That is where > traditional > web content - broadcast or not - comes valuable. And a very important > feature > is to point to the actual TV program from this HTML content to get watching > the > TV program. Think for example DirecTV's online EPG at > http://www.directv.com/misc/pgm_guide/guide.html. It would be nice to get to > tuned to the channel just by pressing the corresponding HTML link. > > ** > > Controlling streaming media. Yep, we absolutely need a common standard set > of functions to control the the streaming media. One approach is the way I > presented > in the workshop, but the most important is to get agreed of a standardized, > or in case > of W3C a recommended way of controlling the media. > > > > 2. Broadcast HTML (tv-related profile of CSS, HTML, etc.) [high] > > 4. Default style sheet for TV [high] > > Needed, because TVs are not as capable as PC to represent different > complicated HTML content. And this way by having broadcast HTML > compatible content we can be quite sure that it looks also good on TV. This > is a good task for W3C to define the HTML profile, or do we need separate > profiles... > > TV style sheet sounds a good idea if current CSS implementation allows to > do all kind of modifications that might bee needed to fit the HTML nicely to > TV screen. One problem is the resource & performance requirements that > CSS support sets. Often the CPU and memory resources are very limited in > the set-top box environment. > > > 3. Authoring guidelines [high] > > 8. filtering/transforming data for specific devices > > device profiles [6] > > (re-processing color palettes, guidelines for ~,...) > > Nice to have one, but not W3C's task. We would be very delighted if for > example > HTML Writer's Guild could generate these guidelines. We can give input to > this > kind of work anyway from our own experience. > > Filtering and transforming sounds very device specific things and are > probably > hard to define in the standardized way. > > > 5. Metadata description/transport [10] > > Good idea, but maybe not currently the most important. Aren't there already > other groups thinking these issues in other concepts... Maybe we can gain > later > from their outputs. > > > 9. accurate layout control[5] > > Good and bad. Of course it would be nice to define precisely where the > objects > appear, but in the same way we loose HTML's "proportionality". How for > example > changing the font size affects to the content... However layout control in > some level > is needed. > > > Questions > > --------- > > Do we continue to use the wwwtv e-mail list for all things and technical > questions > or should we create separate groups for discussing different things? > > >From the discussions we can later probably form an interest group or a > working > group to get these issues further. > > > Organisational review > > -------------------- > > > > - Did the workshop fullfill your expectations ? > > - What did you get out of it ? > > - What should be done differently next time ? > > Yes, it was good get people under the same roof to think these issues and > present > their own ideas. Hopefully some real actions are the final results. The > workshop > was also a good place to create synergy between different parties. > > Sincerely, > Tommi Riikonen & Kimmo Djupsjöbacka > Nokia Multimedia Network Terminals >
Received on Thursday, 9 July 1998 11:40:50 UTC