Streaming Video over the Internet - PowerPoint PPT Presentation

Loading...

PPT – Streaming Video over the Internet PowerPoint presentation | free to download - id: 44535d-OTVkM



Loading


The Adobe Flash plugin is needed to view this content

Get the plugin now

View by Category
About This Presentation
Title:

Streaming Video over the Internet

Description:

Title: Adaptive QoS Control for MPEG-4 Video Communication over Wireless Channels Last modified by: Dapeng Wu Created Date: 5/17/2000 1:48:30 AM Document presentation ... – PowerPoint PPT presentation

Number of Views:91
Avg rating:3.0/5.0
Slides: 31
Provided by: wuEceUfl1
Category:

less

Write a Comment
User Comments (0)
Transcript and Presenter's Notes

Title: Streaming Video over the Internet


1
Streaming Video over the Internet
  • Dapeng Wu
  • Electrical Computer Engineering
  • University of Florida

2
What is Streaming Video?
Receiver 1
  • Download mode no delay bound
  • Streaming mode delay bound

Access SW
Domain B
Domain A
Data path
Domain C
Access SW
Internet
Source
Receiver 2
RealPlayer
cnn.com
3
Outline
  • Challenges for quality video transport
  • An architecture for video streaming
  • Video compression
  • Application-layer QoS control
  • Continuous media distribution services
  • Streaming server
  • Media synchronization mechanisms
  • Protocols for streaming media
  • Summary

4
Time-varying Available Bandwidth
Receiver
No bandwidth reservation
Access SW
Domain B
Rgt56 kb/s
Domain A
Data path
Rlt56 kb/s
56 kb/s
RealPlayer
Source
cnn.com
5
Time-varying Delay
Receiver
Access SW
RealPlayer
Domain B
Domain A
Data path
Delayed packets regarded as lost
56 kb/s
Source
cnn.com
6
Effect of Packet Loss
Receiver
No packet loss
Access SW
Domain B
Domain A
Data path
Loss of packets No retransmission
Source
7
Unicast vs. Multicast
Multicast
Unicast
Pros and cons?
8
Heterogeneity For Multicast
  • Network heterogeneity
  • Receiver heterogeneity

Receiver 2
256 kb/s
Access SW
What Quality?
Domain B
Domain A
Domain C
Internet

Gateway
Ethernet
Telephone networks
1 Mb/s
Source
Receiver 1
Receiver 3
64 kb/s
What Quality?
9
Outline
  • Challenges for quality video transport
  • An architecture for video streaming
  • Video compression
  • Application-layer QoS control
  • Continuous media distribution services
  • Streaming server
  • Media synchronization mechanisms
  • Protocols for streaming media
  • Summary

10
Architecture for Video Streaming
11
Video Compression
Layer 0
64 kb/s
Layer 1
256 kb/s
Layered Coder
Layer 2
1 Mb/s
Layered video encoding/decoding. D denotes the
decoder.
12
Application of Layered Video
Receiver 2
256 kb/s
IP multicast
Access SW
Domain B
Domain A
Domain C
Internet

Gateway
Ethernet
Telephone networks
1 Mb/s
Source
Receiver 1
Receiver 3
64 kb/s
13
Application-layer QoS Control
  • Congestion control (using rate control)
  • Source-based, requires
  • rate-adaptive compression or
  • rate shaping
  • Receiver-based
  • Hybrid
  • Error control
  • Forward error correction (FEC)
  • Retransmission
  • Error resilient compression
  • Error concealment

14
Congestion Control
  • Window-based vs. rate control (pros and
    cons?)

Window-based control
Rate control
15
Source-based Rate Control
16
Video Multicast
  • How to extend source-based rate control to
    multicast?
  • Limitation of source-based rate control in
    multicast
  • Trade-off between bandwidth efficiency and
    service flexibility

17
Receiver-based Rate Control
IP multicast for layered video
Receiver 2
256 kb/s
Access SW
Domain B
Domain A
Domain C
Internet

Gateway
Ethernet
Telephone networks
1 Mb/s
Source
Receiver 1
Receiver 3
64 kb/s
18
Error Control
  • FEC
  • Channel coding
  • Source coding-based FEC
  • Joint source/channel coding
  • Delay-constrained retransmission
  • Error resilient compression
  • Error concealment

19
Channel Coding
20
Delay-constrained Retransmission
21
Outline
  • Challenges for quality video transport
  • An architecture for video streaming
  • Video compression
  • Application-layer QoS control
  • Continuous media distribution services
  • Streaming server
  • Media synchronization mechanisms
  • Protocols for streaming media
  • Summary

22
(No Transcript)
23
Continuous Media Distribution Services
  • Content replication (caching mirroring)
  • Network filtering/shaping/thinning
  • Application-level multicast (overlay networks)

24
Caching
  • What is caching?
  • Why using caching? WWW means World Wide Wait?
  • Pros and cons?

25
Outline
  • Challenges for quality video transport
  • An architecture for video streaming
  • Video compression
  • Application-layer QoS control
  • Continuous media distribution services
  • Streaming server
  • Media synchronization mechanisms
  • Protocols for streaming media
  • Summary

26
Streaming Server
  • Different from a web server
  • Timing constraints
  • Video-cassette-recorder (VCR) functions (e.g.,
    fast forward/backward, random access, and
    pause/resume).
  • Design of streaming servers
  • Real-time operating system
  • Special disk scheduling schemes

27
Media Synchronization
  • Why media synchronization?
  • Example lip-synchronization (video/audio)

28
Protocols for Streaming Video
  • Network-layer protocol Internet Protocol (IP)
  • Transport protocol
  • Lower layer UDP TCP
  • Upper layer Real-time Transport Protocol (RTP)
    Real-Time Control Protocol (RTCP)
  • Session control protocol
  • Real-Time Streaming Protocol (RTSP) RealPlayer
  • Session Initiation Protocol (SIP) Microsoft
    Windows MediaPlayer Internet telephony

29
Protocol Stacks
30
Summary
  • Challenges for quality video transport
  • Time-varying available bandwidth
  • Time-varying delay
  • Packet loss
  • An architecture for video streaming
  • Video compression
  • Application-layer QoS control
  • Continuous media distribution services
  • Streaming server
  • Media synchronization mechanisms
  • Protocols for streaming media
About PowerShow.com