The MPEG-DASH Standard for Multimedia Streaming Over the Internet Chih-Hsiang Chou Advisor: Prof Dr. Ho-Ting Wu Department of Computer Science and Information Engineering, National Taipei University of Technology Taiwan, ROC. Data:13/05/27

Introduction DASH A simple case of adaptive streaming Scope of MPEG-DASH MPD and Segment format Additional features References 2 Outline

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. 3

Introduction Problems :  Contention for CPU and I/O resources at the video server. This may cause variations in the transmission rate supportable by server. 4

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? 5

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. 6

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. 7

DASH About DASH  3GPP - Adaptive HTTP Streaming  Open IPTV Forum – HTTP Adaptive Streaming  Adobe – Dynamic Streaming  Microsoft – Smooth Streaming  Apple – HTTP Live Streaming 8

DASH About DASH Industry Forum 9

DASH 10

A simple case of adaptive streaming 11

Scope of MPEG-DASH 12

Scope of MPEG-DASH 13 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

Multimedia Presentation Description 14

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 15

Segment format Each media segment is assigned  a unique URL  an index  start time and duration 16

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. 17

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. 18

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. 19

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

Thanks for your listening 21