Carriage of TV-Anytime on DVB Transport Streams ETSI TS 102 323 V1.1

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Carriage of TV-AnytimeonDVB Transport
StreamsETSI TS 102 323 V1.1

• David White, NDS

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Content PVRs

• The concept of content (Blackadder) is not the
  same as when it is broadcast (Thursday evenings).
• PVRs free content from schedules
• There needs to be an easy link from content being
  offered to it being recorded and consumed.
• The CRID is the solution TV-Anytime has
  standardised for referring to and obtaining
  content.
• TV-Anytime specs ETSI TS 102 822

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Overview of CRIDs

• CRID is a Uniform Resource Identifier (URI)
• CRID//ltauthoritygt/ltdatagt
• ltauthoritygt is split into two parts
• ltDNS namegtltpathgt
• ltDNS namegt is a registered internet domain name
• ltpathgt is an optional element preceded with
  to allow multiple authorities to share a domain.
• ltdatagt part is allocated by the authority.
• E.g. CRID//sky.comfilms/CastAway

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CRID Resolution
CRIDTOP
crids resolve to lists (of crids or locators).
Lists can be getOne or getAll.
A CRID can resolve to other CRIDs.
(GetAll)
CRIDA
CRIDB
CRIDC
(GetOne)
locator
locator
CRIDB1
CRIDB2
(GetOne)
locator
locator
locator
At some point, CRIDs must resolve to locations
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Metadata

• Describes content
• Programmes and series
• Schedules and channel information
• Segmentation
• Access before and after booking
• Search of MD may lead to content
• A recommendation may lead to content, but MD
  required after booking
• TV-Anytime specifies
• XML Schema
• Encoding for broadcast
• But not delivery format!

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Overview of TVA on DVB
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The CRI Authority

• All CRIDs are published by an authority
• Metadata is often accessed by CRID therefore by
  authority
• Authority is not tied to a particular Network,
  Bouquet, Transport stream or Service
• Authority is a new entity in a DVB network

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RNT Structure
CRID authority entry
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CRI structure
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Metadata

• XML is very verbose - unsuitable for broadcast
• TV-Anytime defines data format
• Fragment Split document
• Encode Compact binary format (MPEG-7 BiM)
• Encapsulate Grouping and identification -
  containers
• Index Rapid access for searching (e.g. by CRID)
• DVB defines broadcast method
• MHP object carousel
• File names of containers
• Linkage for finding metadata required
• Enhancements
• BiM codecs for DVB URI, strings, time date, etc
• Standard indices (e.g. Programme by CRID)

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Trailer booking
Delivering the CRID with description alongside
trailer broadcasts
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Recording

• CRIDs resolve into locators
• Broadcast locator has 3 modes
• Time only mode - simplest mode
• Event_id mode - supported by DVB now/next
  information
• TVA_id mode
• Overlapping and nested programmes
• Programme status
• Starting shortly, running, paused, canceled
• Carried in EIT p/f (DVB now/next information)
• Extensions to this in V1.2

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Headend infrastructure

• TVA supports distributed model
• Different authorities produce CRI and metadata
• Distribution of data creation is a customer
  decision
• Integration with existing SI
• Additional tables
• metadata descriptors in NIT, BAT, SDT, PMT.
• Extensions to EIT to insert CRID
• Carousel delivery
• CRI and metadata
• Real-time delivery
• Trailer booking and TVA_id recording data

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The TVA on DVB V1.1 toolkit

• Characteristics
• Efficient
• Scalable
• Flexible
• Contains
• Represents TVA concept of an Authority
• CRI delivery
• Metadata delivery - a generic tool!
• Trailer booking
• Integration with EPGs
• V1.1 is missing segmentation

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Timelines and segmentation

• DSM-CC NPT rejected for TV-A on DVB segmentation
  timeline
• Factors generation, distribution, manipulation
• No other candidate technology met requirements
• Timelines and segmentation group formed
• Sub-group of DVB-GBS
• Implementing segmentation (TVA on DVB V1.2)
• Creating a new timeline technology (Sync-ed Aux
  data)
• Corrigenda to TVA on DVB v1.1

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Timelines 1

• Specification for the carriage of synchronised
  auxiliary data
• Working document GBS0173
• Timeline features
• Timeline manipulation (sync-ed pause, stop,
  start)
• Multiple timelines
• Different timeline format (video timecode, audio
  offsets)
• Primary and offset timelines
• Modes to avoid Advert-skipping

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Timelines 2

• Synchronised
• Timeline samples carried in PES DTS PTS
• Remultiplexing is straightforward
• Receiver passes-on data at timeDTS
• Auxiliary
• Open framework
• descriptor structure in PES packet
• Different types of data
• Timeline samples
• Recording control (TVA_id)

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Segmentation

• Linking it in is challenging!
• Requirements
• Delivery pre, post or during broadcast
• What information might be known?
• What information can receiver use?
• Dynamic and static modes
• Either possible if delivery during broadcast
• Using external segmentation
• Disney segmentation of Bambi via internet
• internal segmentation capabilities

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Conclusion

• Two specifications in progress
• V1.2 of TVA on DVB (corrigenda segmentation)
• V1.1 of Synchronised Auxiliary Data
• Completion - end of year
• Segmentation
• Flexibility of delivery modes
• Timelines
• Standard MPEG synchronisation
• Standard distribution remultiplexing
• Completes the TVA on DVB toolkit