Multiplexing

1
Multiplexing

• Team Members
• Cesar Chavez
• Arne Solas
• Steven Fong
• Vi Duong
• David Nguyen

2
Streaming Protocols
3
TCP Transmission Control Protocol

• Protocol used for reliable document transfer
• HTTP (Hypertext Transfer Protocol) uses TCP as
  the protocol for reliable document transfer.
• Unsuitable for video and audio because
• Imposes flow control
• Unnecessary Message delivery

4
UDP User Datagram Protocol

• UDP is the alternative to TCP.
• UDP forsakes TCP's error correction and allows
  packets to drop out if they're late or damaged.
• Access Problems (firewalls).

5
RTP

• The data part of RTP is a thin protocol providing
  support for applications with real-time
  properties.
• continuous media (timing reconstruction )
• loss detection
• security
• content identification.

6
VDP

• VDP is an augmented RTP with demand resend.
• VDP creates two channels between the client and
  server.
• One is a control channel.
• The other channel is for the streaming data.

7
RTSP

• . RTSP is a communications protocol for control
  and delivery of real-time media.
• It defines the connection between streaming
  media client and server software
• Provides a standard way for clients and servers
  from multiple vendors to stream multimedia
  content.

8
RSVP

• Protocol designed to allow the assignment of
  priorities to "streaming" applications.
• Works by permitting an application transmitting
  data over a routed network to request and receive
  a given level of bandwidth.

9
Media Streaming

• Comparison of Commercial Video Streaming Products
• Commercial Video Servers
• Research on Continuous Media Toolkits and QoS
  Architectures

10
Comparison of Commercial Video Streaming Products

• Deliver highest quality video for a given
  bandwidth, lowest delay, no jitter(low frame
  loss), good audio/visual synchronization, high
  quality audio, and image resolution.
• Best possible video quality over a range of
  networks/bandwidths without content duplication
  is highly desirable. This characteristic is
  referred to as scalability.
• Commercial products offer two types of
  scalability.

11
Continued

• One is the encoding state. A range of encoding
  formats to choose from, which correspond to a
  range of bandwidths.
• Two is the dynamic scalability based on the
  available bandwidth at the time. Where dynamic
  scalability is provided it is usually simple
  frame dropping.

12
Commercial Video Servers

• High-end database-driven video servers are also
  available from companies like IBM, Oracle, SGI,
  Sun and Tektronix. These products should be
  considered for large scale applications or for
  serving large numbers of simultaneous stream.

13
Research on Continuous Media Toolkits and QoS
Architectures

• The following are the major research project
  investigating the use of scalable video
  compression to dynamically adapt to variable
  bandwidth, to ensure multimedia delivery.
• Berkeley Continuous Media Toolkit
• Application Level Gateway
• Distributed Real-time MPEG Video Audio Player
• Multimedia Communication Filters
• Image and Advanced TV Lab, Columbia
• DSTC SuperNova

14
Video Streaming Standards

• H.261
• H.263
• MPEG1
• MPEG2
• MPEG4

15
H.261

• H.261 is use for teleconferencing applications
  and is intended for carrying video over ISDN.
• H.261 needs substantially less CPU power for
  real-time encoding than MPEG.
• H.261 uses constant-bit-rate encoding.

16
H.263

• H.263 is design for low bitrate communication.
• H.263 expected to be use for wide range of
  bitrate and expected to replace H.261.
• H.263 supports 5 resolutions, able to compete
  with MPEG standards.

17
MPEG-1

• MPEG-1 offers VHS quality video at a bandwidth of
  1-1.5Mbps.
• The resolution id at 30 frames per second
• MPEG-1 requires expensive hardware for real-time
  encoding.
• MPEG-1 does not offer resolution scalability
• MPEG-1 is not suitable for video conferencing

18
MPEG-2

• MPEG-2 is a better standard than MPEG-1
• MPEG-2 include support for higher resolution
  video and increased audio capabilities.
• MPEG-2 offers broadcast quality and full screen
  video at a bandwidth of 4-18Mbps.
• More expensive than MPEG-1 to encode and decode.

19
MPEG-4

• MPEG-4 is still in its experimental stage
• Compression scheme for video conferencing ,
• MPEG-4 can be use for multiplexing for
  transmission over different networks
• MPEG-4 framework focuses on a language called MSDL

20
Movie Maker by Sony
21
(No Transcript)
22
(No Transcript)
23
(No Transcript)
24
(No Transcript)
25
(No Transcript)
26
(No Transcript)
27
(No Transcript)