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Optimizing DVTS for Heterogeneous Internet: Adjustable Bandwidth and Frame Rate Solutions

This project, led by Yasuo Tsuchimoto at Keio University and WIDE, explores the Digital Video Transmission System (DVTS) in diverse network environments. It highlights communication applications such as distance learning and online meetings without the need for special equipment or encoding delays. The introduction of a 'thin-out' module enables dynamic frame rate reduction (from 30fps to 10fps) while maintaining video quality under varying bandwidth conditions. Our approach supports IPv4/IPv6 and demonstrates effective traffic reduction, ensuring reliable DV stream delivery even in poor network conditions.

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Optimizing DVTS for Heterogeneous Internet: Adjustable Bandwidth and Frame Rate Solutions

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  1. Adjustable Bandwidth DVTS for Heterogeneous Internet Environment Yasuo Tsuchimoto AIT / Keio / WIDE tsuchy@ait.ac.th

  2. 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

  3. Heterogeneous Internet Environment Example)

  4. 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

  5. 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

  6. 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

  7. 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

  8. 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

  9. The design of Thin-out module

  10. 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

  11. 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

  12. Result

  13. 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

  14. Final goal of this project

  15. Thank you, any questions?

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