The MPEG-DASH Standard for Multimedia Streaming

Over the Internet

Chih-Hsiang ChouAdvisor: Prof Dr. Ho-Ting Wu

Department of Computer Science and Information Engineering,National Taipei University of Technology

Taiwan, ROC.

Data:13/05/27

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• Introduction• DASH• A simple case of adaptive streaming• Scope of MPEG-DASH• MPD and Segment format• Additional features• References

Outline

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Introduction• Problems :

Delivering video content over the Internet started in the 1990s with timely delivery and consumption of large amounts of data being the main challenge.

Video streaming service in a heterogeneous network environment is the variation in the receiver’s video playback capability.

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Introduction• Problems :

Contention for CPU and I/O resources at the video server. This may cause variations in the transmission rate supportable by server.

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Introduction• Potential market

Watching the Olympics live over the Internet?

Streaming last week’s episode of your favorite TV show to your game console?

Watching a 24-hour news TV channel on your mobile phone?

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Introduction• Potential market

Every commercial platform is a closed system with its own manifest format, content formats, and streaming protocols.

One of the main enablers of this would be an adopted standard that provides interoperability between various servers and devices.

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DASH• About DASH

Dynamic Adaptive Streaming over HTTP (DASH), also known as MPEG-DASH, enables high quality streaming of media content over the Internet delivered from conventional HTTP web servers.

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DASH• About DASH

3GPP - Adaptive HTTP Streaming

Open IPTV Forum – HTTP Adaptive Streaming

Adobe – Dynamic Streaming

Microsoft – Smooth Streaming

Apple – HTTP Live Streaming

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DASH• About DASH Industry Forum

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DASH• About DASH Industry Forum

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A simple case of adaptive streaming

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Scope of MPEG-DASH

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Scope of MPEG-DASH• program timing• media-content

availability• media types• resolutions• minimum and maximum

bandwidths• accessibility features• required digital rights

management(DRM)• media-component

locations on the network

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Multimedia Presentation Description

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Segment format• A segment is defined as the entity

body of the response to the DASH client’s HTTP GET.

• A media component is encoded and divided in multiple segments.

• The first segment might be an initialization segment containing the required information for initialization

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Segment format• Each media segment is assigned

a unique URL an index start time and duration

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Segment format• To enable downloading segments in multiple parts,

the specification defines a method of signaling subsegments using a segment index box.

• The indexing information of a segment can be put in the single box at the beginning of that segment, or spread among many indexing boxes in the segment.

• Different methods of spreading are possible, such as hierarchical, daisy chain, and hybrid.

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Additional features• Switching and selectable streams.

selecting one audio stream from different languages, selecting the subtitles from provided languages, dynamically switching between different bitrates of the

same video camera.

• Ad insertion.• Compact manifest.• Fragmented manifest.

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Additional features• Scalable Video Coding (SVC) and Multiview Video

Coding (MVC) support.• A flexible set of descriptors.

components’ roles, accessibility features, camera views, audio channels’ configuration

• Quality metrics for reporting the session experience.

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References[1] Ranga S. Ramanujan, Jim A. Newhouse, Maher N. Kaddoura, Atiq Ahamad, Eric R. Chartier, and Kenneth J. Thurber. “Adaptive Streaming of MPEG Video over IP Networks”, Proceedings of the 22nd IEEE Conference on Computer Networks (LCN’97), November 1997.

[2] I. Sodagar. “ The MPEG-DASH Standard for Multimedia Streaming Over the Internet”, IEEE Multimedia, 2011.

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Thanks for your listening