HTTP Streaming of MPEG Media

HTTP Streaming of MPEG Media
Christian Timmerer and Christopher Müller
Klagenfurt University (UNIKLU)  Faculty of Technical Sciences (TEWI)
Department of Information Technology (ITEC)  Multimedia Communication (MMC)
http://research.timmerer.com  http://blog.timmerer.com  mailto:christian.timmerer@itec.uni-klu.ac.at
STreaming Day, 17thSeptember 2010, Udine, Italy
Acknowledgments. This work was supported in part by the European Commission in the context of the ALICANTE project (FP7-ICT-248652).

Outline
Introduction / Background
What and why HTTP streaming?
Related work
Use cases, context & scope, requirements
Dynamic Adaptive Streaming over HTTP (DASH)
Outcome of the MPEG CfP evaluation
MPEG DASH prototype in VLC
Conclusions and Future Work
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Christian Timmerer, Klagenfurt University, Austria

What and Why HTTP Streaming?
HTTP Streaming ::= delivery of continuous media + HTTP + consumption w/o downloading the entire content
HTTP & TCP not efficient: required bandwidth = 2 xbitrate of media due to TCP overhead
Still, HTTP streaming has become a “de-facto standard” on the Internet for two reasons
Reasonable Internet connectivity (i.e., in terms of bandwidth for media content) is nowadays available anywhere, anytime, and almost on any device
HTTP does not cause any NAT/firewall issues as it is the case with other media transport protocols like RTP/RTSP
However, no standard available but …
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Related Work
3GPPs' Adaptive HTTP Streaming (AHS)
Media Presentation Description (MDP)
Extensions to ISO Base Media File Format (ISOBMFF)
Adobes' Dynamic HTTP Streaming
Flash Media Manifest File (FMF): XML (similar to MPD)
F4F file format: MP4 fragment files, i.e., also based on ISOBMFF
Apples' HTTP live streaming
Well known for quite some time and implemented in the iPhone
M3U playlist file which serves as manifest
Each media file must be formatted as an MPEG-2 Transport Stream or an MPEG-2 audio elementary stream
Microsofts' Smooth Streaming
Server manifest file (i.e., SMIL document) and a client manifest file (i.e., proprietary XML document)
Smooth streaming format (ISMV) as an extension of the ISO Base Media File Format
Open IPVT Forum (OIPF)
Published on Sep 7th, 2010 including "HTTP Adaptive Streaming" which adopts 3GPP AHS and adds support for MPEG-2 Transport Stream
Riiseret.al.
Low overhead container format for adaptive streaming: alternative to the MPEG family with good performance
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Requirements for HTTP Streaming of MPEG Media
Use Cases
Emerging applications and contents such as Ultra-HD (UHD) content, 3D video, and interactive 3D
Adaptivity concerning different network and device capabilities and conditions
Delivery in terms of progressive download, peer-to-peer (P2P), multi-channel (multi-pipe) delivery, and relaying of content
Convergence and transparency to content protection
Objectives and Scope
Efficient delivery of MPEG media over HTTP in an adaptive, progressive, download/streaming fashion
Support of live streaming of multimedia content
Efficient and ease of use of existing content distribution infrastructure components such as CDNs, proxies, caches, NATs and firewalls
Support of integrated services with multiple components
Support for signaling, delivery, utilization of multiple content protection and rights management schemes
Support for efficient content forwarding and relay
Requirements on
content, delivery, decoding and presentation support, service control, adaptation, and content protection
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CfP issued in April 2010 & evaluated in July 2010
15 submissions from 20 companies/institutions/universities
Submissions received in the following areas
Manifest File (MF): Playlist, Media Presentation Description, … mostly XML-based
Delivery Format (DF) as extensions/specializations of
ISO Base File Format (ISOBMFF)
MPEG-2 Transport Stream (M2TS)
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DASH System Architecture
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Server
Client
MF
MF
DF
DF
ISOBMFF
ISOBMFF
easyconversion
easyconversion
M2TS
M2TS
Legend:
MF … ManifestDF … Delivery Format
ISOBMFF … File Format (extensions)
M2TS … Transport Stream (extensions)

MPEG DASH Prototype in VLC
Extended VLC to support MPD (.3gm) and .3gp/.3gs files
Added composition layer on top of MPD based on MPEG-21 DID Choice/Selection
Demo video available onhttp://www.youtube.com/watch?v=Yt1F0ULsA1w
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Server
VLC
Req for CMP
CMP download
User selection basedon choices in CMP
Req for MPD (.3gm)
MPD download
Dynamic Adaptive Streamingover HTTP based on MPD
.3gp/.3gs requests

MPEG DASHPrototype in VLC
Open DASH stream dialog
feat. MPEG-21 DID
Choice/Selection
Download CMP file
General description
Additionaldescription for choices
URL for MPD
Play .3gp/.3gs files based onMPD (.3gm)
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http://www.youtube.com/watch?v=Yt1F0ULsA1w

Conclusion and Future Work
DASH ::= Emerging MPEG standard for HTTP Streaming with wide industry support
Timeline
Committee Draft (CD): 2010/10
Final Committee Draft (FCD): 2011/01
Final Draft International Standard (FDIS): 2011/07
Currently, evaluation experiments conducted
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Special Session at ACM MMSys’11
Special Session on Modern Media Transport
Topics
Efficient delivery of modern media over HTTP in an adaptive, progressive download/streaming fashion,
Support for streaming of live multimedia content,
Efficient and ease of use of existing content distribution infrastructure components such as CDNs, proxies, caches, NATs and firewalls;
Efficient mapping from existing formats (e.g., MPEG-2 TS, MP4) to delivery formats specifically designed for HTTP streaming.
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ACM Multimedia Systems 2011
February 23-25, 2011
San Jose, California
http://www.mmsys.org
Important Dates
Submission: Oct. 22nd, 2010
Notification: Nov. 26th, 2010
Camera-ready: Dec. 17th, 2010

Thank you for your attention
... questions, comments, etc. are welcome …
Ass.-Prof. Dipl.-Ing. Dr. Christian Timmerer
Klagenfurt University, Department of Information Technology (ITEC)
Universitätsstrasse 65-67, A-9020 Klagenfurt, AUSTRIA
christian.timmerer@itec.uni-klu.ac.at
http://research.timmerer.com/
Tel: +43/463/2700 3621 Fax: +43/463/2700 3699
© Copyright: Christian Timmerer
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HTTP Streaming of MPEG Media

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