Real-Time Video Splitting and Merging Techniques for inverse multiplexing over GPRS

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Real-Time Video Splitting and Merging Techniques
for inverse multiplexing over GPRS

• Roll No 2006-03-0031
• M. Mudassar Nazar

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Introduction

• Unfortunately Scarcity of bandwidth is limiting
  us to deploy multimedia applications
• In our country, dialup is a method of getting
  advantage of the internet
• Some ISPs are providing DSL

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Introduction--continued

• Situation is more severe in Rural areas
• Fortunately, telecom revolution enabled us
• But unfortunately, low bandwidth is again a
  problem

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Problem Formulation

• What can we do?
• Idea is simple?
• Inverse multiplexing

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Inverse Multiplexing

• Source Horde

A
B
N network channels
M data streams
M data streams
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Motivation

• Telemedicine
• Live video lecturing

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Challenges

• Although idea is very simple
• Some key issues need to be solved
• End to End Characteristics Measurement
• Video splitting and merging techniques
• Scheduling of packets to different channels
• Maintenance and handling of different GPRS
  channels
• And a lot more

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Challenges

• Although idea is very simple
• Some key issues need to be solved
• End to End Characteristics Measurement
• Video splitting and merging techniques
• Scheduling of packets to different channels
• Maintenance and handling of different GPRS
  channels
• And a lot more

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Literature ReviewHorde

• Define the architecture of the inverse
  multiplexer
• Give application the flexibility to specify QoS
• Applications specify QoS through objective
  specification language

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Horde Architecture
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ObjectiveExample

• objective
• context
• streamfoo stream_id "audio1"
• goal foolatency_ave lt 1000
• utility foo 100
• An objective expressing the policy that the
  average
• latency on a stream should be less than one
  second.

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Literature Review--MobiStream

• Partitions video frames into into independently
  decodable small units
• MDC
• Slice structured video coding
• Slice interleaving
• Inter-frame
• Intra-frame
• Talk about assigning priority according to
  perceptual value (visual usefulness)

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Q A