Content reference identifier: Difference between revisions

Revision as of 09:05, 9 January 2013

Revision as of 22:44, 27 January 2013

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A '''Content Reference Identifier''' or '''CRID''' is a concept from the standardization work done by the [[TV-Anytime]] forum. It is or closely matches the concept of the [[Uniform Resource Locator]], or URL, as used on the [[World-Wide Web]]:

{{Quotation|A unit of content, in a [[Broadcasting|broadcast stream]], can be referred to by its globally unique CRID in the same way that a [[webpage]] can be referred to by its globally unique URL on the web.}}<!--source? or is it not a quotation?-->

<blockquote>

A unit of content, in a [[Broadcasting|broadcast stream]], can be referred to by its globally unique CRID in the same way that a [[webpage]] can be referred to by its globally unique URL on the web.

</blockquote><!--source? or is it not a quotation?-->

A CRID is specified much like URLs. In fact, a CRID is a so-called [[Uniform Resource Identifier|URI]]. Typically, the content owner will use their [[Domain Name System|DNS]]-names in a combination with a product-specific name to create globally unique CRIDs. As an example, let's assume that [[BBC]] wanted to make a CRID for the Olympics in China. It may have looked something like this

: crid://bbc.co.uk/olympics/2008/

Then, to refer to a specific event - such as the women's shot-put final - they could have used the following inside their metadata.

: crid://bbc.co.uk/olympics/2008/final/shotput/women

Currently,{{When?|date=January 2013}} four types of CRIDs are playing a major role in some [[Unidirectional networks|unidirectional]] [[Television network|television networks]]: programme CRID, series CRID, group CRID, and recommendation CRID. One of the most important applications of CRIDs is the so-called series link recording function (SL) of modern digital video recorders ([[Digital_video_recorder|DVR]], [[Personal_video_recorder|PVR]]).

== In web casting ==

To make the CRID even more globally available the [[IETF]] will publish a request for comments specifying the use of the CRID over the web. This will allow consumer devices to hook up to content provider servers, much like current browsers look up webservers, requesting content by CRID.

In May 2005, an Informational RFC, [http://tools.ietf.org/html/rfc4078 No 4078], was published as the start of this work.

The long-term goal is that CRIDs should be available for use by [[cell phones]], [[Personal digital assistant|PDA]]s, [[Digital television|digital TV]] [[Set-top box|receivers]] and other [[Consumer electronics|consumer devices]] for fetching content, either from a broadcast stream or over [[Internet Protocol|IP]]-based [[computer network|networks]].

== References ==

* [ftp://ftp.rfc-editor.org/in-notes/pdfrfc/rfc4078.txt.pdf RFC 4078 (PDF)] Accessed October 27, October 2011

* [ftp://ftp.rfc-editor.org/in-notes/rfc4078.txt RFC 4078 (TXT)] Accessed October 27, October 2011

<!-- THIS SECTION IS BECOMING A WP:LINKFARM AND THE REFERENCES ARE UNCLEAR

* [http://www.powershow.com/view/9afe8-MmViM/TVAnytime_An_adaptation_to_DVB_Transport_Streams_and_Implementation_in_European_Projects_flash_ppt_presentation White, David & Tol, Ronald. "TV-Anytime An adaptation to DVB Transport Streams and Implementation in European Projects" (2009-09-22)] Accessed October 28, October 2011

* [http://tech.ebu.ch/tvanytime/ The new TV-Anytime website.] Accessed September 21, 2011

* [http://wwwtech.tv-anytimeebu.orgch/tvanytime/ The new TV-Anytime website.] Accessed August21 26,September 20052011

* http://toolswww.ietftv-anytime.org/html/rfc4078 Accessed 26 August 26, 2005

* http://tools.ietf.org/html/rfc4078 Accessed 26 August 2005
* [http://www.nordig.org/pdf/NorDig_PVR_metadata_whitepaper_ver_1.0.pdf NorDig PVR Metadata Whitepaper Version 1.0, Page 11, Section 9.2: "CRID"] Accessed 11 September 11, 2011

* [http://www.nordig.org/pdf/NorDig-Unified_ver_2.3.pdf NorDig Unified Requirements for Integrated Receiver Decoders for use in cable, satellite, terrestrial and IP-based networks, Page 120, Section 12.4.6: "CRID encoding and reuse"] Accessed July 24, July 2012

* [http://www.nordig.org/pdf/NorDig_Unified_Test_specification_ver_2.2.1.pdf NorDig Unified Test Specifications, Page 366, "Task 12:14 ESG/EPG recording programming – series"] Accessed November4 04,November 2012

* [http://www.etsi.org/deliver/etsi_ts/102800_102899/10282202/01.04.01_60/ts_10282202v010401p.pdf ETSI TS 102 822-2 V1.4.1 (2007-11), Page 19, Section 5: "TV-Anytime content referencing scenarios"] Accessed December3 03,December 2012

* [http://www.etsi.org/deliver/etsi_ts/102800_102899/10282204/01.07.01_60/ts_10282204v010701p.pdf ETSI TS 102 822-4 V1.7.1 (2012-12), Page 13, Section 8: "CRID"] Accessed January 9, January 2013

* [http://www.etsi.org/deliver/etsi_ts/102300_102399/102323/01.05.01_60/ts_102323v010501p.pdf ETSI TS 102 323 V1.5.1 (2012-01), Page 27, Section 6: "CRIDs and other URIs in DVB networks"] Accessed March1 01,March 2012

* [http://projects.vdr-developer.org/projects/vdrtva/files VDR Series Record Plugin] Accessed February3 03,February 2012

* [http://www.freeview.com.au/faq/glossary.aspx?glossaryId=19 Series Link recording function] Accessed June 18, June 2012

* [http://www.freeview.com.au/faq/glossary.aspx?glossaryId=20 Intuitive Recording] Accessed May 19, May 2012

* [http://www.bbc.co.uk/rd/projects/eca/technology/t8.shtml Mapping to TV-Anytime] Accessed January 30, January 2012

* [http://downloads.bbc.co.uk/rd/pubs/whp/whp-pdf-files/WHP148.pdf BBC Research White Paper WHP 148] Accessed March 14, March 2012

* [https://industry.youview.com/resources/YouView_Core_Technical_Specification_1.0.pdf YouView Core Technical Specification, Version 1.0] Accessed July 30, July 2012

* [https://industry.youview.com/resources/1.0/1110-S_Content_Acquisition_and_Management_v.1.0.pdf YouView Content Acquisition and Management for Connected Television, Version 1.0] Accessed August 1, August 2012

* [https://industry.youview.com/resources/1.0/4301-S_Business-to-business_Metadata_Interface_v.1.1.3.pdf YouView – Business-to-Business Metadata Contribution – Technical Interface, Revision 1.1.3 (18 November 2010), Page 33, Section 6.1.5: "Content Referencing Identifier (CRID) specification"] Accessed August 3, August 2012

* [https://industry.youview.com/resources/1.0/4102-S_Business-to-consumer_Metadata_Interface_v.1.1.2.pdf YouView Metadata Specification: Business-to-consumer delivery interface over IP, Version 1.1.2] Accessed August 12, August 2012

* [http://www.teracom.se/Documents/Produkter/Irdtesting/Teracom%20DTT%20receiver%20spec%20v2.3.pdf Minimum Receiver Requirements for Teracom and Boxer DTT Networks] Accessed September4 04,September 2012

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