1. Stefan Lederer
Fö rd e r ve re i n
Te c h n i s c h e Fa ku l tät
Content Generation and Practical
Applications for Dynamic Adaptive
Streaming over HTTP with a Focus on Mobile
and Peer-Assisted Streaming

2. Motivation
• HTTP Streaming has become very popular on the
Internet
– Various different bitrates of the video are available on the
server --> choose the best version to load
– Easy to use existing CDN structure
– No NAT/Firewall issues due to HTTP
– Various technologies
• BUT: no standard in use!
FTI | Stefan Lederer
Slide 2

3. DASH Dataset Sequences
FTI | Stefan Lederer
Slide 3

4. Vehicular Environment &
Test Tracks
• Autobahn:
Villach-Klagenfurt
• Connection: A1 Mobile Internet USB Stick
GPRS to HSDPA
FTI | Stefan Lederer
Slide 4

5. Results:
MS Smooth Streaming
30 sec. Buffer, smooth representation switch
FTI | Stefan Lederer
Slide 5

6. Results:
Apple HTTP Live Streaming
Transmission pause, pretty constant quality
FTI | Stefan Lederer
Slide 6

7. Results:
Adobe Dynamic Streaming
Not suitable, BUT: Incremental Buffer Size
FTI | Stefan Lederer
Slide 7

8. Results:
MPEG DASH with Pipelining
Tries go get best quality, too many switches
FTI | Stefan Lederer
Slide 8

9. Results Comparison
Name
Average
Bitrate [kbps]
Average Switches
[Number of
Switches]
Average
Unsmoothness
[Seconds]
Microsoft
1522
51
0
Adobe
1239
97
64
Apple
1162
7
0
MPEG –
DASH
1464
166
0
FTI | Stefan Lederer
Slide 9

10. Peer Assisted Streaming
FTI | Stefan Lederer
Slide 10

11. Simulation Results - Server
- 25 %
FTI | Stefan Lederer
Slide 11

12. The END
http://dash.itec.aau.at