nus.soc.cs5248 ooi wei tsang rate adaptations. nus.soc.cs5248 ooi wei tsang you are here network...
TRANSCRIPT
![Page 1: NUS.SOC.CS5248 Ooi Wei Tsang Rate Adaptations. NUS.SOC.CS5248 Ooi Wei Tsang You are Here Network Encoder Sender Middlebox Receiver Decoder](https://reader035.vdocuments.site/reader035/viewer/2022062519/5697bfa81a28abf838c995c6/html5/thumbnails/1.jpg)
NUS.SOC.CS5248Ooi Wei Tsang
Rate Adaptations
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NUS.SOC.CS5248Ooi Wei Tsang
You are Here
Network
Encoder
Sender
Middlebox
Receiver
Decoder
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NUS.SOC.CS5248Ooi Wei Tsang
Sender’s Algorithm
open UDP socketforeach video frame chop into packets add RTP header send to network
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NUS.SOC.CS5248Ooi Wei Tsang
Sender’s Algorithm
open UDP socketforeach video frame chop into packets add RTP header send to network wait for 1/fps seconds
![Page 5: NUS.SOC.CS5248 Ooi Wei Tsang Rate Adaptations. NUS.SOC.CS5248 Ooi Wei Tsang You are Here Network Encoder Sender Middlebox Receiver Decoder](https://reader035.vdocuments.site/reader035/viewer/2022062519/5697bfa81a28abf838c995c6/html5/thumbnails/5.jpg)
NUS.SOC.CS5248Ooi Wei Tsang
Sender’s Algorithm
open UDP socketforeach video frame chop into packets foreach packet add RTP header send to network wait for size/bps seconds
![Page 6: NUS.SOC.CS5248 Ooi Wei Tsang Rate Adaptations. NUS.SOC.CS5248 Ooi Wei Tsang You are Here Network Encoder Sender Middlebox Receiver Decoder](https://reader035.vdocuments.site/reader035/viewer/2022062519/5697bfa81a28abf838c995c6/html5/thumbnails/6.jpg)
NUS.SOC.CS5248Ooi Wei Tsang
Rules
Transmission rate should match encoding rate
Transmission should not be too bursty
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NUS.SOC.CS5248Ooi Wei Tsang
Two Approaches
Just send at a fix rate or “I hope the network can handle it”
approach”
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NUS.SOC.CS5248Ooi Wei Tsang
Effects on TCP: Simulation
From Sisalem, Emanuel and Schulzrinne paper on“Direct Adjustment Algorithm”
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NUS.SOC.CS5248Ooi Wei Tsang
Effects on TCP
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NUS.SOC.CS5248Ooi Wei Tsang
Demo
Effects of UDP on TCP without congestion control
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NUS.SOC.CS5248Ooi Wei Tsang
Two Approaches
Just send at a fix rate or “I hope the network can handle it”
approach”
Adapt transmission/encoding rate to network condition
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NUS.SOC.CS5248Ooi Wei Tsang
How to Adapt?
if network condition is badreduce rate
else if network condition is so-so do nothingelse if network condition is good increase rate
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NUS.SOC.CS5248Ooi Wei Tsang
How to ..
Know “network condition is bad”?
increase/decrease rate?
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NUS.SOC.CS5248Ooi Wei Tsang
if network condition is bad
else if network condition is so-so do nothingelse if network condition is good
Adapting Output Rate
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NUS.SOC.CS5248Ooi Wei Tsang
Question:
What should and be?
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NUS.SOC.CS5248Ooi Wei Tsang
Observation 1
Should never change your rate more than an equivalent TCP
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NUS.SOC.CS5248Ooi Wei Tsang
Observation 2
and should depend on network conditions and current rate.
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NUS.SOC.CS5248Ooi Wei Tsang
Goal: Fair Share of Bottleneck
let r r : current rateb : bottleneck
bandwidth S : current share
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NUS.SOC.CS5248Ooi Wei Tsang
S vs
1S
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NUS.SOC.CS5248Ooi Wei Tsang
Value of
(Assuming one receiver)
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NUS.SOC.CS5248Ooi Wei Tsang
Limit of
M : packet size : round trip timeT : period between evaluation of
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NUS.SOC.CS5248Ooi Wei Tsang
Limit of
M : packet size: round trip timeT : period between evaluation of
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NUS.SOC.CS5248Ooi Wei Tsang
loss rate vs
loss rate
1
1
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NUS.SOC.CS5248Ooi Wei Tsang
Value of
where is the loss rate k is a constant
(Assuming one receiver)
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NUS.SOC.CS5248Ooi Wei Tsang
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NUS.SOC.CS5248Ooi Wei Tsang
What is Needed?
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NUS.SOC.CS5248Ooi Wei Tsang
Estimating b : Packet Pair
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NUS.SOC.CS5248Ooi Wei Tsang
Estimating b : Packet Pair
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NUS.SOC.CS5248Ooi Wei Tsang
Estimating b : Packet Pair
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NUS.SOC.CS5248Ooi Wei Tsang
Evaluation
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NUS.SOC.CS5248Ooi Wei Tsang
More TCP-Friendly Rate Control
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NUS.SOC.CS5248Ooi Wei Tsang
TCP-Equation
Window size behavior in TCP/IP with constant loss probability T. Ott, J. Kemperman, and M. MathisJune 1997, HPCS 1997
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NUS.SOC.CS5248Ooi Wei Tsang
TCP-Equation
Equation-Based Congestion Control for Unicast Applications Sally Floyd, Mark Handley, Jitendra Padhye, and Joerg Widmer.August 2000. SIGCOMM 2000
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NUS.SOC.CS5248Ooi Wei Tsang
Another Transport Protocol
Datagram Congestion Control Protocol (DCCP)
Implements congestion control but not reliability
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NUS.SOC.CS5248Ooi Wei Tsang
Rules
Transmission rate should match encoding rate
Transmission should not be too bursty
![Page 36: NUS.SOC.CS5248 Ooi Wei Tsang Rate Adaptations. NUS.SOC.CS5248 Ooi Wei Tsang You are Here Network Encoder Sender Middlebox Receiver Decoder](https://reader035.vdocuments.site/reader035/viewer/2022062519/5697bfa81a28abf838c995c6/html5/thumbnails/36.jpg)
NUS.SOC.CS5248Ooi Wei Tsang
Rate Control
Given a rate, how to encode the video with the given rate?
![Page 37: NUS.SOC.CS5248 Ooi Wei Tsang Rate Adaptations. NUS.SOC.CS5248 Ooi Wei Tsang You are Here Network Encoder Sender Middlebox Receiver Decoder](https://reader035.vdocuments.site/reader035/viewer/2022062519/5697bfa81a28abf838c995c6/html5/thumbnails/37.jpg)
NUS.SOC.CS5248Ooi Wei Tsang
Reduce Frame Rate
Live Video
Stored Video
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NUS.SOC.CS5248Ooi Wei Tsang
Reduce Frame Resolution
Live Video
Stored Video
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NUS.SOC.CS5248Ooi Wei Tsang
Increase Quantization
Live Video
Stored Video
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NUS.SOC.CS5248Ooi Wei Tsang
Drop AC components
Live Video
Stored Video
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NUS.SOC.CS5248Ooi Wei Tsang
Trouble with Stored Video
Reducing rate requires partial decoding and re-encoding
Solution: Layered Video
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NUS.SOC.CS5248Ooi Wei Tsang
Layered Video
or “Scalable Video”
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NUS.SOC.CS5248Ooi Wei Tsang
Layered Video
Layer 1 Layer 2 Layer 3
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NUS.SOC.CS5248Ooi Wei Tsang
Layering Scheme
Temporal Layering
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NUS.SOC.CS5248Ooi Wei Tsang
Layering Scheme
Spatial Layering
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NUS.SOC.CS5248Ooi Wei Tsang
Layering Scheme
DCT Layering
30 8
-6 -1
2 0
0 0
1 0
0 0
0 0
0 0
30 8
-6 -1
2
1
30
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NUS.SOC.CS5248Ooi Wei Tsang
Layering Scheme
Fine Granularity Scalability (FGS)
1 0 0 0 0 1 0 0
1 0 0 1 0 1 0 1
1 1 1 0 0 0 1 0
1 1 0 0 0 0 0 0
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NUS.SOC.CS5248Ooi Wei Tsang
Rate Adaptation
To increase rate, send more layersTo decrease rate, drop some layers
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NUS.SOC.CS5248Ooi Wei Tsang
MS Windows Streaming Media
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NUS.SOC.CS5248Ooi Wei Tsang
Intelligent Streaming
Multiple-Bit-Rate Encoding Intelligent Bandwidth Control
bit rate selection thinning
Intelligent Image Processing
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NUS.SOC.CS5248Ooi Wei Tsang
Intelligent Streaming
How exactly does it work?Sorry, it’s proprietary
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NUS.SOC.CS5248Ooi Wei Tsang
Is WSM TCP friendly?
Measurements of the Congestion Responsiveness of Windows Streaming Media
J. Nichols et. al., NOSSDAV 2004
All figures taken from the original NOSSDAV presentation
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NUS.SOC.CS5248Ooi Wei Tsang
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NUS.SOC.CS5248Ooi Wei Tsang
340kbps clip, 725kbps bottleneck
![Page 55: NUS.SOC.CS5248 Ooi Wei Tsang Rate Adaptations. NUS.SOC.CS5248 Ooi Wei Tsang You are Here Network Encoder Sender Middlebox Receiver Decoder](https://reader035.vdocuments.site/reader035/viewer/2022062519/5697bfa81a28abf838c995c6/html5/thumbnails/55.jpg)
NUS.SOC.CS5248Ooi Wei Tsang
Transmission is Bursty
![Page 56: NUS.SOC.CS5248 Ooi Wei Tsang Rate Adaptations. NUS.SOC.CS5248 Ooi Wei Tsang You are Here Network Encoder Sender Middlebox Receiver Decoder](https://reader035.vdocuments.site/reader035/viewer/2022062519/5697bfa81a28abf838c995c6/html5/thumbnails/56.jpg)
NUS.SOC.CS5248Ooi Wei Tsang
340kbps clip, 725kbps bottleneck
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NUS.SOC.CS5248Ooi Wei Tsang
548kbps Clip - 725kbps Bottleneck
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NUS.SOC.CS5248Ooi Wei Tsang
1128kbps Clip - 725kbps Bottleneck
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NUS.SOC.CS5248Ooi Wei Tsang
725kbps Bottleneck
Buffering Playout
Single Encoded Bit Rate
![Page 60: NUS.SOC.CS5248 Ooi Wei Tsang Rate Adaptations. NUS.SOC.CS5248 Ooi Wei Tsang You are Here Network Encoder Sender Middlebox Receiver Decoder](https://reader035.vdocuments.site/reader035/viewer/2022062519/5697bfa81a28abf838c995c6/html5/thumbnails/60.jpg)
NUS.SOC.CS5248Ooi Wei Tsang
725kbps Bottleneck
Multiple Encoded Bit Rate
Buffering Playout
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NUS.SOC.CS5248Ooi Wei Tsang
Conclusion
Two phases: buffering + playoutNot always TCP-friendly