Firing up dvts over ipv6
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Firing Up DVTS over IPv6. Bill Cerveny. What is DVTS?. “Digital Video over IP” Videoconferencing over IPv6 or IPv4 with preference for IPv6 A product of the Wide Project Operating Systems Supported. FreeBSD NetBSD Linux

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Presentation Transcript

What is dvts
What is DVTS?

  • “Digital Video over IP”

  • Videoconferencing over IPv6 or IPv4 with preference for IPv6

  • A product of the Wide Project


Operating systems supported
Operating Systems Supported

  • FreeBSD

  • NetBSD

  • Linux

  • Windows 2000 and Windows XP (IPv4 only as of Jan 10, 2002)

  • MacOS X -- incomplete; IPv4 seems to work; IPv6 stuff incomplete

Tested operating system environments
Tested Operating System Environments

  • Linux

    • Must use specific Linux kernel and configuration

    • Used Debian Linux, but any Linux variant should be OK

    • Firewire configuration on desktop easy, but challenging on laptop PC

    • Once working, everything looked obvious

    • Gory details at end of presentation

Tested operating system environments1
Tested Operating System Environments

  • MacOS X

    • Wasn’t able to build without significant modification; port incomplete

Tested configuration

DV Camcorder

DV Camcorder

Desktop or

Laptop PC

Desktop or

Laptop PC

Tested Configuration

This shows video/audio flow

Going one direction only. For

Both directions, duplicate this

Going in opposite direction.

Firewire Link

15-30Mbps IPv6


15-30Mbps IPv6


Composite Video

Video Content

Firewire Link

Network traffic generated
Network Traffic Generated

  • By default, 32Mbps IPv6 or IPv4 traffic is generated in each direction (30 frames per second)

  • Can reduce frame rate to 15 frames per second to reduce bandwidth to about 16Mbps without noticable degradation in video performance

Bandwidth stats from test between chicago and armonk ny
Bandwidth Stats from Test Between Chicago and Armonk, NY

  • Abilene (mix of IPv4 and IPv6 traffic)

Bandwidth stats from test between chicago and armonk ny1
Bandwidth Stats from Test Between Chicago and Armonk, NY

  • Armonk IPv6 Router Stats - FastEthernet Interface

Armonk, NY IPv6 Router Stats - Tunnel


  • DVTS Main Page -

  • DVTS Presentation to Internet2 IPv6 Workshop in Los Angeles -

Linux configuration notes
Linux Configuration Notes

  • Configured on Debian Linux, 2.4.12 kernel.

  • Turned on IEEE1394 (and IPv6) support in Linux kernel

  • DVTS source code looks for IEEE1394 kernel source code at /usr/src/linux/drivers/ieee1394

  • Must install libraw1394 libraries

Kernel configuration 1 of 3 turning on experimental code
Kernel configuration - 1 of 3Turning on “Experimental” Code

Personal linux hardware compatibility notes
Personal Linux/Hardware Compatibility Notes

  • What works:

    • IBM Thinkpad T21 and 600E

      • Western Digital IEEE1394 Cardbus card (WDAD0003-RNW)

      • Sony DCR-PC9 Camcorder (also DCR-PC3 and DCR-PC7)

      • Sony A/D Converter

    • Dell 400Mhz GX1

      • Pinnacle PCI IEEE1394 card

      • Orange Micro IEEE1394/USB PCI card (USB not tested)

      • Siig PCI card

      • All Firewire devices listed above

Personal hardware compatibility notes
Personal Hardware Compatibility Notes

  • Doesn’t work:

    • Siig 2-port Cardbus card (NN-PC2012)

    • Dazzle Hollywood A/D Bridge


  • Don’t try to use ohci1394 stuff in pcmcia-cs source code -- it doesn’t work and developers don’t intend to fix it (I wasted a lot of time troubleshooting it, before I gave up)

  • If you are using a Cardbus IEEE1394 card and Linux freezes, you must remark some ohci1394 initialization code (this seems to be a laptop memory problem)

Final note about dvts imho
Final Note about DVTS (IMHO)

  • You have to get past source code and hardware configuration problems, but once you do this, DVTS seems easy and straightforward.