Advanced network accounting notes (VII)

Multimedia network applications

It involves multimedia network applications such as audio and video

The application type

Fluidization , Store audio and video

• Storage
  On the server , Non real time data generation
  Faster transmission than playback —— Can be cached 、 Prefetch
• Fluidization （ A one-way ）
  Play before downloading the entire file
  The network bandwidth is sufficient and the server has stored

characteristic

• Fluidization
• Interactivity
• Play continuously

Network needs

Average bandwidth > Playback bandwidth
Path bandwidth changes , Cache smooth throughput changes

technology

• cache
• Prefetch
• Adaptive broadband quality
• CDN

IP Interactive audio / video

• Interactive audio ： Internet phone VoIP
• Interactive video ： visual telephone

characteristic

• Data is generated in real time
• Fluidization
• double / Multidirectional

Network needs

• Bandwidth requirements ： Interactivity requires a delay of less than $100ms$
• Little jitter
• Loss Insensitive

technology

• Adaptive playback
• FEC
• Error concealment

Fluidization , Real time audio and video

• Live online video
• Webcasts

Realization way

• Network layer multicast
• Application layer multicast

characteristic

• data real time produce
• Fluidization
• A one-way , Multi user

The live broadcast platform can interact

Network needs

bandwidth ：$10S$ acceptable

technology

• Initial cache
• Adaptive bandwidth
• CDN distribution