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High Definition Video Is Coming To H.323-Based Videoconferencing. Larry Amiot Northwestern University amiot@northwestern.edu. Broadcast High Definition TV. Breathtaking video quality on home monitors Plasma LCD and projection LCD Projection DLP Several carriers Through the air Cable

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high definition video is coming to h 323 based videoconferencing

High Definition Video Is Coming To H.323-Based Videoconferencing

Larry Amiot

Northwestern University

amiot@northwestern.edu

broadcast high definition tv
Broadcast High Definition TV
  • Breathtaking video quality on home monitors
    • Plasma
    • LCD and projection LCD
    • Projection DLP
  • Several carriers
    • Through the air
    • Cable
    • Satellite dish
broadcast high definition tv3
Broadcast High Definition TV
  • High Definition is here to stay!
  • High definition is fast replacing standard definition TV!
  • Standard definition
    • 704x480
    • 4x3 aspect ratio
  • Two high definition standard formats
    • 720p (1280x720)
    • 1080i (1920x1080)
    • Both 16x9 aspect ratio
h 323 based videoconferencing
H.323-based Videoconferencing
  • Compression/decompression architectures
    • Initially blurred and murky H.261 codecs
    • Major use today is H.263
    • Beginning to see H.264 (MPEG4)
  • Bandwidth requirements have been low (typically 1 Mbps or less)
h 323 based videoconferencing5
H.323-based Videoconferencing
  • Resolutions have been limited
    • Typically CIF (352x288)
    • Recent use of 4CIF (704x576 )- e.g. the Gigaconference requiring bandwidths of 1 to 4 Mbps
  • Aspect ratio of 4x3
  • Several audio algorithms, but typically low quality at 64 Kbps
high definition h 323 based videoconferencing
High Definition H.323-based Videoconferencing
  • High definition videoconferencing is on the horizon
  • H.323-based high definition video and audio provides the quality necessary for media rich collaboration
  • Being standards-based, it offers
    • User simplicity
    • Promise of interoperability with other non-high definition H.323 systems
lifesize h 323 based room unit
LifeSize H.323-Based Room Unit
  • Produces 720p high definition video
  • Utilizing H.264 codec
  • 16x9 aspect ratio
  • 9CIF quality
  • 1 Mbps bandwidth (can go at 2 Mbps point to point)
lifesize h 323 based room unit8
LifeSize H.323-Based Room Unit
  • Built-in 4 port MCU
  • Good acoustical quality
    • omni-directional architecture
    • circular array of 16 microphones
    • 100 Hz up to 22 kHz bandwidth
  • High definition camera with 70 degree field of view
other high quality video options
Other High Quality Video Options
  • MPEG2
    • VBrick, StarValley, etc
    • High quality video in the 7 to 16 Mbps range
    • Used at Northwestern for remote venues
  • DVTS
    • Lot of work being done in the Big Video project
    • Transports digital video over IP at 30 Mbps
other high quality video options10
Other High Quality Video Options
  • HDV
    • MPEG2 compressed High definition video
    • 20 Mbps transfer rates
  • Uncompressed high definition video
    • Highest quality video of all
    • 720p requires transmission rate of 165 Mpixels per second
    • Requires special equipment to handle streams
  • Access Grid high definition experiments
  • Microsoft ConfernceXP
    • MPEG4 compressed high definition
what are the driving forces
What Are The Driving Forces?
  • Do you need high definition resolution?
  • How important is audio quality?
  • Is aspect ratio important
  • Do you have sufficient bandwidth?
  • Do you need two way interaction (conferencing)?
  • Is H.323 interoperability important?
  • What can you afford?