Adjustable bandwidth dvts for heterogeneous internet environment
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Adjustable Bandwidth DVTS for Heterogeneous Internet Environment. Yasuo Tsuchimoto AIT / Keio / WIDE [email protected] Digital Video Communication. DVTS can support communications Distance learning On-line meeting Observations Characteristic of DV stream

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Adjustable Bandwidth DVTS for Heterogeneous Internet Environment

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Adjustable bandwidth dvts for heterogeneous internet environment

Adjustable Bandwidth DVTS for Heterogeneous Internet Environment

Yasuo Tsuchimoto

AIT / Keio / WIDE

[email protected]


Digital video communication

Digital Video Communication

  • DVTS can support communications

    • Distance learning

    • On-line meeting

    • Observations

  • Characteristic of DV stream

    • Full NTSC/PAL quality video stream

    • No special equipments are needed

    • No encoding delay

    • 30Mbps traffic


Heterogeneous internet environment

Heterogeneous Internet Environment

Example)


Approach

Approach

  • Encoding video?

    • No!

    • Encoding delay will be generated

    • The video quality can be worse than original

  • Receiver-driven Layered Multicast?

    • Maybe yes…

    • But jitter expected to become big

    • Replacement of sender and receiver required


Approach cont

Approach (cont.)

  • Reducing frame rate?

    • Yes!

    • Small frame rate is acceptable

    • Small overhead

      • Acceptable delay

    • No need to touch sender and receiver

    • User doesn’t have to know about network


Design

Design

  • How can we reduce frame rate?

  • The small box with frame thin-out function

    • On the path from sender and receiver

30fps

30fps

10fps


Dvts repeater

DVTS repeater

  • It has a function of both dvsend and dvrecv

  • Thin-out module is added

  • It can be cascaded

    • narrower network can receive lower frame rate

  • Named dvrelay


Basic idea how to thin out

One frame consist from many DIF blocks.

IP packet carry 17 DIF blocks

Audio Video and some info

Focus on RTP timestamp

It increases 3003 for every frame

It can specify the frame

dvrelay thin out only video

Video DIF block will omitted

Other block will be transferred

Basic idea: How to thin out


The design of thin out module

The design of Thin-out module


Implementation

Implementation

  • It is implemented on application layer

    • Any kind of traffic can be thinned out

      • Unicast – Unicast

      • Multicast – Unicast

      • Unicast – Multicast

      • Multicast – Multicast

  • Support both IPv4 and IPv6

  • Currently dvrelay can be run on Linux box


Test dvrelay

Test: dvrelay

  • Sending Full DV stream from sender

  • dvrelay thin-outs frames

    • it change the frame rate from 30fps to 10fps

  • Receiver receives 10fps DV stream


Result

Result


Conclusion and future work

Conclusion and future work

  • dvrelay can reduce the traffic

    • Bandwidth can be reduced by dvrelay

    • Poor environment can receive DV stream

  • Evaluations using AI3

    • Bandwidth

    • Jitter

    • Delay


Final goal of this project

Final goal of this project


Thank you any questions

Thank you, any questions?


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