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Engin Kurutepe, Cagdas Bilen, Anil Aksay, Goktug Gurler, Thomas Sikora, Gozde Bozdagi Akar, Murat Tekalp A 3DTV collaboration between METU, KU and TUB ITG Fachtagung, HHI, Berlin, 22.06.2007. A Flexible and Standards -Compatible Architecture for MVC Streaming. System Overview.

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A Flexible and Standards -Compatible Architecture for MVC Streaming

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A flexible and standards compatible architecture for mvc streaming l.jpg

Engin Kurutepe, Cagdas Bilen, Anil Aksay, Goktug Gurler, Thomas Sikora, Gozde Bozdagi Akar, Murat Tekalp

A 3DTV collaboration between METU, KU and TUB

ITG Fachtagung, HHI, Berlin, 22.06.2007

A Flexible and Standards-Compatible Architecture for MVC Streaming


System overview l.jpg

System Overview

  • Standards-based, flexible, end-to-end Multi-View Video (MVV) Streaming system

    • Server and streaming: TUB

    • Encoding – decoding: METU

    • Client and display: KOC

  • MVC encoded MVV representation

  • RTP/RTSP/SDP Server can serve various clients

    • Legacy 2-D

    • Static Stereo (3DV)

    • Dynamic Stereo – Head Tracking (3DV + FVV)

    • N-View (3DV + FVV)

  • Based on open-source libraries (Live Media and FFMPEG)

  • An initial demo system was shown at GRM2 in Bodrum

  • Final version will be demonstrated in IBC Amsterdam

Multi-View Streaming


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Multi-View Encoding

  • Simulcast Coding

    • JM Reference Software (H.264 monoscopic standard) (GRM2 Demo System)

  • Stereo/MultiView Coding

    • MMRG Codec (Implemented in METU, without B picture support)

    • JMVM 3.0 (Upcoming new standard)

      • Complex prediction structures

  • Encoders are not real-time

Multi-View Streaming


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Possible MVC Coding Schemes in JMVM

General MVC Scheme

Multi-View Streaming


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Possible MVC Coding Schemes in JMVM

Simplified MVC Scheme (IPPP)

Multi-View Streaming


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Multi-View Decoding

  • Simulcast Decoding

    • JM Decoder: Slow

    • FFMPEG Decoder: Fast, doesn’t support Hierarchical B-frames correctly, compiled in Linux, can be used in Windows apps, used in some open source media players, encoders, decoders (GRM Demo)

  • Multi-View Decoding

    • JMVM Decoder: Slow

    • Modified JM Decoder: Implemented but still slow

    • Modified FFMPEG Decoder:under development

Multi-View Streaming


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Network Overview

  • Standards-based streaming system

  • Session announcement and initiation: SDP

  • Control of Streaming: RTSP

  • Streaming of media: RTP

Multi-View Streaming


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RTSP (Real Time Streaming Protocol) Basics

Multi-View Streaming


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SDP (Session Description Protocol) Basics

  • Session Description Protocol

  • Provides information to initiate RTP streaming

  • SDP Announcement lists all sessions available at the server

  • Each session consists of several media-level sections (audio, video, application…)

  • Media-level sections can be extended with new attributes for future formats

Multi-View Streaming


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SDP for MVV

  • A Session for a whole MVV representation

  • N video media-level sections for N-view MVV

  • Client can request and play media-level sections independently

  • Each view is streamed to a different port on the client over RTP

  • Only streams for key-views (Intra Coded) are independently decodable.

  • Dependencies between streams are announced through a new extended media-level attribute

Multi-View Streaming


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New SDP Parameters

  • The new x-reflist attribute is used to denote the immediate dependencies of a stream.

    • a:x-reflist=96 97

  • The dependencies are given in a space separated list

  • The numbers correspond to rtpmap attributes of the reference streams, which are RTP payload types and are dynamically assigned for H.264/AVC streams

  • The client should go through the reference list recursively.

Multi-View Streaming


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MVV over RTP (Real Time Protocol)

  • RFC 3984 is standard for H.264 streaming

  • MVC bit stream is “almost” H.264 compliant

    • Can be streamed in accordance with RFC 3984

  • What about 2-D clients or clients with various 3-D display systems?

  • RFC 3984 is extended to allow flexibility

    • Each view is handled as a separate H.264 Stream

    • Views synchronized using RTP Timestamps

    • Clients request streams according to their capabilities

    • Varying levels of error protection can be applied to different streams

Multi-View Streaming


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On-going work

  • Server support for accurate seeking

  • Support for selective streaming

  • Real-Time decoding of MVC

  • Visits of partners from KU and METU to TUB in August 2007

  • Code will be submitted to 3DTV repository

  • SDP extensions and RTP Payload format for MVC may be candidates for IETF standardization

Multi-View Streaming


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Thank you.

  • Question, suggestions, comments?

Multi-View Streaming


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