Streaming Video Optimization Techniques

Video Streaming Ali Saman Tosun Computer Science Department

Broadcast to True Media-on-Demand ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Streaming Stored Video ,[object Object],[object Object],[object Object],[object Object],[object Object]

Streaming Video ,[object Object],constant bit rate video transmission Cumulative data time variable network delay client video reception constant bit rate video playout at client client playout delay buffered video

Smoothing Stored Video ,[object Object],[object Object],[object Object],[object Object],[object Object],1 2 n b bytes Server Client

Smoothing Constraints ,[object Object],[object Object],[object Object],[object Object],[object Object],L U S time (in frames) number of bytes rate changes

Proxy-based Video Distribution Server Proxy Client Client Proxy adapts video Proxy caches video

Proxy Operations ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Online Smoothing ,[object Object],[object Object],[object Object],[object Object],b bytes Source/Proxy Client streaming video Source or proxy can delay the stream by w time units: stream with delay w

Online Smoothing Model ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],B b D i-w A i S i proxy client

Online Smoothing ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],max{D i-w , A i - B}  S i <= min{D i-w + b, A i }

Online Smoothing Constraints Source/proxy has w frames ahead of current time t: L U time (in frames) number of bytes t t+w-1 don’t know the future Modified smoothing constraints as more frames arrive... ?

Smoothing Star Wars GOP averages 2-second window 30-second window ,[object Object],[object Object],[object Object]

Prefix Caching to Avoid Start-Up Delay ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Changes to Smoothing Model ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],b s b p b c A i D i-s S i

Scalable coding ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Sending rate Quality Best possible quality at possible sending rate Base layer Enhancement layer

Temporal Scalability ,[object Object],[object Object],[object Object],[object Object]

Spatial Scalability ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Base layer Enhancement layer Better compression due to low values Less data to code 72 75 83 61 73 -1 -12 2 10

SNR Scalability ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Multiple Description Coding ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Delivery Systems Developments Network Saving network resources: Stream scheduling Several Programs or Timelines

Patching ,[object Object],multicast Unicast patch stream Central server 1st client 2nd client Join ! cyclic buffer

Proxy Prefix Caching ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Client Unicast Unicast Central server Prefix cache

Interval Caching (IC) ,[object Object],[object Object],[object Object],I 32 I 33 I 21 I 11 I 31 I 12 Video clip 1 S 11 Video clip 1 S 11 S 12 Video clip 1 S 12 S 11 S 13 Video clip 2 S 22 S 21 Video clip 3 S 33 S 31 S 32 S 34 I 11 I 12 I 21 I 31 I 32 I 33

Receiver-driven Layered Multicast (RLM) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Receiver-driven Layered Multicast (RLM)

Streaming Video Optimization Techniques

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