Delivery of Timeline for External Data in MPEG-2 Transport Stream
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The document outlines the objectives and proposals of the h2b2vs project at Telecom ParisTech, which aims to improve the distribution of TV programs over diverse broadcast and broadband networks using new HEVC compression technology. Key enhancements include frame-accurate synchronization for 3D and Ultra HD content, dynamic enhancements, and a stable timeline for transport streams. The proposal focuses on efficient signaling and data management without disrupting existing infrastructures.
Delivery of Timeline for External Data in MPEG-2 Transport Stream
- 1. Telecom ParisTech Timeline Delivery for MPEG-2 TS enhancements m29227 lefeuvre@telecom-paristech.fr
- 2. Telecom ParisTech H2B2VS Project H2B2VS focuses on the distribution of TV programs and services over heterogeneous networks: • Broadcast network (terrestrial, satellite, cable) and • Broadband network (ADSL, fibre, mobile, …), by making use of a new compression technology: HEVC
- 3. Telecom ParisTech Goals Enhance existing broadcast • Media replacements, scalable enhancements Without impacting existing broadcast infrastructure • StatMux or other equipments Rationale • Scarcity of Spectrum resources prevents Broadcast network operators to propose new services • Difficulties for broadband networks to address specific groups of people or some small geographical areas (towns, districts, …) 4/26/20133
- 4. Telecom ParisTech TS Service with perceptual Sync Audio switch from/to enhanced audio • user watches TV and switch from stereo to 5.1 • Possibility to move from a language to another one ─ Dubbing track in native language to/from track in original language ─ National language to/from regional languages, … Visual Data • Subtitles, text annotations • Picture-In-Picture ─ Sign language video ─ Video overlay 26/04/20134
- 5. Telecom ParisTech TS Service with frame-accurate Sync 3D distribution • The broadcast carries the 2D “legacy” program, 3D version is delivered over broadband • Needs frame-accurate presentation UltraHD TV distribution • The Broadcast carries the AVC HD program, UltraHD version can be delivered broadband with SHVC enhancement • Needs frame-accurate decoding 26/04/20135
- 6. Telecom ParisTech Technical Goals Indicate location of the enhancement • URL pointing to external resource • Optionally, indicate MIME type Provide stable timeline for TS • Not impacted by PCR discontinuity • Not impacted by muxers • Map PES timestamps to a media timeline Dynamic enhancements • Send prefetching information • Send reload/change of enhancements Tools, not services • How media is acquired is out of scope (buffering, …) • How media is consumed is out of scope (decoding, …) • No restrictions on enhancement media type 26/04/20136
- 7. Telecom ParisTech Proposal Description Single PES stream • Avoids PMT update when enhancement changes • Less impact on existing muxers • Not touching media PES streams Signaling • Mime types and service URL • Media timeline • Reload marker • Service announcement for prefetch 26/04/20137
- 8. Telecom ParisTech Proposal 26/04/20138 MediaTimelineTime_PES_Payload { has_mime has_location force_location_reload is announcement reserved=0 if (has_mime) { mime_length for (i=0;i<mime_length;i++) { mime_type } } if (has_location) { url_length for (i=0;i< url_length;i++) { addon_url } } timescale if (is_announcement) { time_before_activation } else { media_time_anchor } } Payload syntax + New PES StreamType