1. MDC METHOD FOR HDTV TRANSMISSION OVER EXISTING IP NETWORK
Students: Supervisors:
Igor Medvetsky Dr. Ofer Hadar
Alexey Minevich Dr. Evgeny Kaminsky

2. Outline Intro to HD video over IP Goals MDC method Summary
High quality video transmission challenges
MDC method
What is MDC?
Suggested solution
Tests results
Summary

3. Intro to HD video over IP
In future, most of the internet traffic will be related to video
Video over IP will replace cable television

4. Intro to HD video over IP
HD video resolution
1280x720 and 1920x1080
Desired bitrate for 720x1280 with H.264 is about 5 Mbit/s
Standard Definition
(576x704)
High definition
(1080x1920)
High Definition
(720x1280)

5. Intro to HD video over IP
Video over internet with RTP
Real-time Transport Protocol (RTP) is best for real-time data streaming
RTP works over UDP 5 4 1 3 2

6. GoalS High quality video over IP challenges HD resolution
High bitrate
Uniform quality video
Errors - Mixture of wired and wireless networks
Packets loss
Path loss
Network backbone high load
A lot of bandwidth to provide HDTV to all users

7. MDC method
What is MDC ?
Multiple Description Coding - Split up video stream into N independent video streams
Dividing can be done in three domains
Time, pixel and frequency

8. MDC method
Dividing in pixel domain

9. MDC method
Dividing in time domain

10. MDC method
Suggested solution – splitting/merging scheme

11. MDC method
Suggested solution
Pixel domain splitting

12. MDC method
Suggested solution
Encoding with H.264 codec

13. MDC method
Suggested solution
Sending in parallel with RTP

14. MDC method
Suggested solution
Receiving 4 (or less) streams

15. MDC method
Suggested solution
Decoding with H.264 codec

16. MDC method Suggested solution
Merging available video streams into single (higher resolution) video stream.

17. MDC method
Suggested solution
Presenting to user

18. MDC method
Suggested solution – the video distribution scheme

19. MDC method Suggested solution Scalability “I paid for HD,
Do you know?”

20. MDC method
Suggested solution
Robust transmission

21. MDC method
Suggested solution
Load Spreading

22. MDC method Results of tests - MDC vs. 1 stream
Packet loss (0.5% - 8.3%)
Same total bitrate of 1200kbit/s
Same video source
Same network conditions

23. MDC method
Results of tests - MDC vs. 1 stream

24. MDC method Results of tests - MDC vs. 1 stream 1 Stream - 2% loss
MDC - 2% loss
MDC - 4% loss

25. Summary What we can achieve with MDC
High quality video for all customers
Smooth video stream in extreme channel interferences (lower video quality)
Scalability - controllable downgrade of video quality to adopt wide range of customers
Decentralization of traffic load from main backbone of network.
Video Coding Standards Independence

26. Summary Suggested solution – drawbacks Good channel conditions
Less vision quality
Dependence on other sub-servers
Specific network configurations

27. Summary Suggested solution – future work
Implementing video distribution network for MDC.
Better approximation algorithm for pixel domain
Real time MDC implementation

28. Questions?