1. DYNAMIC ADAPTIVE STREAMING OVER
HTTP (MPEG-DASH)
OPEN SOURCE TOOLS | CLOUD SERVICES
Stefan Lederer
bitmovin Alpen Adria Universität
Lakeside Science and Technology Park Klagenfurt
Building B01 Universitätsstrasse 65-77
9020 Klagenfurt 9020 Klagenfurt
Austria | Europe Austria | Europe
Tel.: 0043 463 2700 8747 Tel.: 0043 463 2700 3623
eMail: office@bitmovin.net eMail: stefan.lederer@itec.aau.at
List: dash@itec.uni-klu.ac.at
www.bitmovin.net
www.bitcodin.com dash.itec.aau.at
bitmovin / AAU Klagenfurt Media Web Symposium 2013 1

2. VIDEO PREDOMINANT ON THE INTERNET
 Real-time video is more than 50% of the traffic at peak periods
 Mobile traffic is growing exponentially, all delivered over the top
(OTT)
Source: http://www.sandvine.com/downloads/documents/Phenomena_1H_2012/Sandvine_Global_Internet_Phenomena_Report_1H_2012.pdf
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3. ... BUT
THERE ARE PROBLEMS!
 Wrong format
 Wrong protocol
 Plugin required
 DRM issues
 Long start-up delay
 Low quality
 Frequent stalls
 Bitrate intense
 No DVD/PVR experience
 ….
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4. … AND HETEROGENEOUS DEVICES
Desktop/Laptop Mobile Living Room
IPTV
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5. DYNAMIC ADAPTIVE STREAMING OVER HTTP (DASH)
Proprietary Solutions International Standards V1 International Standards V2
Apple HTTP Live
Streaming
3GPP Rel.9 Adaptive
3GPP Rel.10 DASH
Adobe HTTP HTTP Streaming
Dynamic Streaming
V3…
Microsoft Smooth
Streaming
OIPF HTTP Adaptive
MPEG-DASH
Streaming
Netflix Akamai
Movestreaming
Amazon ...
Zeit
http://multimediacommunication.blogspot.com/2010/05/http-streaming-of-mpeg-media.html
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6. DYNAMIC ADAPTIVE STREAMING OVER HTTP
Different Quality
Representations Changing Bandwidth
© bitmovin
Choose the appropriate
 Dynamic adaption to the network conditions Segment
 Usage of existing and cheap Internet (HTTP) Infrastructure
 Streaming-Logic is located at the Client
 Flexible and scalable
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7. DASH REFERENCE ARCHITECTURE
© bitmovin
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8. DASH@GPAC: MP4Box & MP42TS
 Multimedia Packagers
• MPEG-2 TS for DASH profiles
• ISOBMFF Packager & Analyser
 DASH Segmenter
• ISOBMFF and M2TS segments
- All DASH profiles supported
- URL-template naming scheme
• Segment indexing (SIDX)
• GOP-align segments or fragments (MediaSourceExtension)
• Automatic AdaptationSet selection
- Media type, codec, language, PAR
- Handle groups (same media but not switchable)
 DASH live simulator
- Manages MPD update and timeline continuity
http://gpac.sourceforge.net

9. DASHENCODER
 DASH Content Generation Tool
 Encoding + Multiplexing + MPD generation
 Generates isoffmain profile compliant MPDs
 Fully configurable
using a config-file
 Enables batch processing
 Currently uses x264
and GPAC‘s MP4Box
 Easy extensible to further
encoders & multiplexers
 http://dash.itec.aau.at © bitmovin
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10. DASH DATASETS
 Dataset with DASH Content
 50 Kbit/s to 8 Mbit/s, 320x240 to 1920x1080
 Long sequences in high quality
 Various segment-length versions
 Free available for DASH experiments
 PSNR values per frame
 DASH datasets for scientific evaluations: player, adaption
logics, cache performance, etc.
 Problem: Content Rights
 CC-Attribution 2.0 Generic (CC-BY 2.0) License or similar
 Free to Share, Free to Remix
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11. DISTRIBUTED DASH DATASET
 Can be used for real-world evaluations
 simulation of switching between different CDNs
 client may dynamically switch between the mirrors
 e.g., in case the one currently used causes any issues
 Currently mirrored at different sites across Europe:
 Klagenfurt, Paris, and Prague
 Open for new mirrors/participants
 RedBull Playstreet sequence:
 Segment lengths of 2, 4, 6, 10, and 15 seconds
 ISOFF-Main and ISOFF-Live profiles
 17 representations, 100kbps to 6 Mbps, 320x240 to 1920x1080
bitmovin / AAU Klagenfurt Media Web Symposium 2013 11

12. DASH VLC PLUGIN
 DASH implementation based on the well-known VLC
player
 Enables the integration of a variety of adaptation logics
and profiles for evaluations in research and development
 Very flexible structure that could be easily extended
 Fully integrated in the
VLC structure
 Part of future
VLC releases
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13.  Open source library that simplifies DASH, by bitmovin
 Handles the download and xml parsing of the MPD
 Implements the full MPEG-DASH standard according to
ISO/IEC 23009-1
 Cross platform build system for Windows, Linux, Mac, etc.
 Configurable download interface, OO-based interface to the
MPD
 Comprehensive sample player using FFMPEG and Qt-based
GUI
 Public mailing list for support requests and code contributions
 Online documentation
 Supported by the Internet Foundation Austria
Available at: www.bitmovin.net/libdash
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14. DASH IN JAVASCRIPT (DASH-JS)
 Completely implemented in JavaScript – no (3rd
party) plugins required
 Makes use of the Media Source API provided by
Google Chrome
 Support for WebM and ISOBMFF
 Provides time based and byte based buffers
 E.g., use as input for adaptation logics
 Flexible adaptation logics
 Easy to extend existing ones or integrate your own
 Various Showcases at: http://dash.itec.aau.at,
http://dash-mse-test.appspot.com
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15. DASH@GPAC: Playback
 DASHClient  Integrated in Osmo4
• DASH ISOBMFF, M2TS (+ HLS) • Many input formats and
- With or without bitstreamSwitching codecs
- Support for multiple Periods • Composition engine
• All profiles except onDemand (SVG, BIFS, X3D)
(ongoing)  Try it!
- VoD through « live » or « main » • Included in libgpac
• Local files and http(s) playback • Independent from player
• Various download policies
GPAC DASH
MPD Playback
Media Bring Your Own
Segments DASH APP !!
http://gpac.sourceforge.net

16. MPD CONFORMANCE VALIDATOR
 Cloud-based validation of MPEG-DASH MPDs for
standard-compliance
 Based on the conformance and reference software
for DASH
 Online validation via file upload, URI, and plain text
input
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17. DASH OVER CCN
 Enables DASH-based Streaming on top of Content
Centric Networks
 Caching Efficient, Connectionless, Multi-Link &
Reliable Transfer, etc.
 Open Source DASH over CCN Plugin for VLC for
usage with CCNx
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18. ADVANTAGES CLOUD EN-/TRANSCODING
 How cloud-services can help?
 Faster time to market
 High scalability for increasing number of users
 Activation/Suspension of additional instances
 Compensation of fluctuating user numbers
(e.g. evening vs. the rest of the day)
 Reduced costs for hardware infrastructure, support and
maintenance
 Redundancy of systems and providers
 No/Low costs before market entry
 Cheap for testing new technologies such as adaptive
Streaming
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19. E.g.: www.bitcodin.com
 Cloud-based Multimedia Encoding Service
 In closed test phase
 Input:
 Live Stream (e.g. RTP, HTTP, etc.)
 Upload/Batch, User Generated Content etc.
 Support for most popular formats/codecs
 Output:
 MPEG-DASH as well as Apple HLS Output
 Additionally the most popular formats/codecs
 Distribution to arbitrary servers/CDNs/platforms
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20. WHY CLOUD SERVICES?
 Comprehensive Interfaces (API) for the integration in
existing encoding chains
 High reliability due to the usage of multiple cloud
instances and multiple quality representations
 If one instance fails, the client automatically chooses
another quality representation
 Different operation models:
 Private-Cloud on you own hardware
 Public Cloud-Infrastructure usage:
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21. CONCLUSIONS
 End-to-end DASH tools available
 GPAC (DASHEncoder) provide support for ISOBMFF, M2TS, etc.
 DASH VLC plugin and libdash (world first DASH player)
 DASH-JS for easy Web integration (HTML5, Javascript)
 Flexible architecture, easy to extend, e.g.:
 Add your own buffer model
 Add your own bandwidth estimation, adaptation logic
 Use cloud infrastructure to reduce costs/time to market
 Open source ressources:
http://dash.itec.aau.at | http://gpac.sourceforge.net
 Feel free to use it, please acknowledge/reference us
 … and feel free to contribute to the projects
bitmovin / AAU Klagenfurt Media Web Symposium 2013 21

22. http://www.bitmovin.net
http://dash.itec.aau.at
Questions, Comments?
bitmovin
Lakeside Science and Technology Park
Building B01
9020 Klagenfurt
Austria | Europe
Tel.: 0043 463 27008747
eMail: office@bitmovin.net
www.bitmovin.net | www.bitcodin.com
bitmovin / AAU Klagenfurt Media Web Symposium 2013 22