OptIPuter Teleconferencing Next Steps Dan Sandin Jan 2007
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Transcript of OptIPuter Teleconferencing Next Steps Dan Sandin Jan 2007
University of Illinois at Chicago
OptIPuter
Teleconferencing Next Steps
Dan Sandin
Jan 2007
University of Illinois at Chicago
An Embarrassment of Riches
• HDV 25Mb 1 sec– Audio interleaved
• DVCPRO HD 100Mb 300ms– Audio interleaved
• HDSDI 1.5Gb < 200ms?– Audio interleaved
• Y U V HD .8Gb < 100ms?– Audio separate
• Varrier Stereo Video 225Mb < 100ms– Audio separate
• GigE camera .8Gb <100ms– No audio
University of Illinois at Chicago
Marketing Categories
• Broadcast– HDSDI– Highest quality, most expensive, low Q/$– Highly standardized, inflexible
• Prosumer– HDV, DVCPRO– Medium to high quality best Q/$– Quite standardized, inflexible
• Industrial– Y U V, Varrier Stereo, GigE– Large range of Q and $– Quite standardized, very flexible
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Organizations
• HDV 25Mb 1 sec– everybody
• DVCPRO HD 100Mb 300ms– qvidium calit2
• HDSDI 1.5Gb < 200ms– research channel UltraGrid Calit2
• Y U V HD .8Gb < 200ms– EVL UltraGrid
• Varrier Stereo Video 225Mb < 100ms– EVL Calit2
• GiGE camera .8Gb <100ms– SARA EVL Calit2
University of Illinois at Chicago
Bandwidth
• HDV 25Mb 1 sec– Audio interleaved
• DVCPRO HD 100Mb 300ms– Audio interleaved
• HDSDI 1.5Gb < 200ms– Audio interleaved
• Y U V HD .8Gb < 200ms– Audio separate
• Varrier Stereo Video 225Mb < 100ms– Audio separate
• GigE camera .8Gb <100ms– No audio
University of Illinois at Chicago
Audio
• HDV 25Mb 1 sec– Audio interleaved
• DVCPRO HD 100Mb 300ms– Audio interleaved
• HDSDI 1.5Gb < 200ms– Audio interleaved
• Y U V HD .8Gb < 200ms– Audio separate
• Varrier Stereo Video 225Mb < 100ms– Audio separate
• GigE camera .8Gb <100ms– No audio
University of Illinois at Chicago
Latency One-Way Transmission Times
• HDV 25Mb 1 sec– Audio interleaved
• DVCPRO HD 100Mb 300ms– Audio interleaved
• HDSDI 1.5Gb < 200ms– Audio interleaved
• Y U V HD .8Gb < 200ms– Audio separate
• Varrier Stereo Video 225Mb < 100ms– Audio separate
• GigE camera .8Gb <100ms– No audio
University of Illinois at Chicago
Latency Why So Late
• Every frame takes 33 ms• Every piece of hardware and every software module
wants a 2 or 3 frame buffer• For us, it is almost never the network
– We need to change that so it is the network
University of Illinois at Chicago
Compression and Resolution or Quality
• HDV 25Mb 1 sec– MPEG; long GOP, low Q
• DVCPRO HD 100Mb 300ms– JPEG-like; better Q
• HDSDI 1.5Gb < 200ms– None; best Q largely depends on camera
• Y U V HD .8Gb < 200ms– None; best Q, largely depends on camera
• Varrier Stereo Video 225Mb < 100ms– None; SD but in stereo
• GigE camera .8Gb <100ms– None; camera has Q problems
University of Illinois at Chicago
Compression and Resolution or Quality
• Uncompressed talking heads HD at 1.5GB is a ridiculous waste of resources– Except for broadcast production– Except for science data– Except for here? or maybe a TV studio, you have
never seen uncompressed HD
• Compression can be done in less than a frame– NTT 4K Jpeg 2000 <500Mb <100ms– spectacular quality !
University of Illinois at Chicago
SAGE and Teleconferencing
• SAGE Visual casting supports YUV and RGB video• Calit2 and EVL will make a DVCPRO HD to SAGE
converter– Note: need to buy xmit box and receive software from Qvidum
• UltraGrid and Research Channel have expressed interest in doing conversion routines to SAGE Visual Casting
University of Illinois at Chicago
SAGE and Teleconferencing
• SAGE Visual casting supports YUV and RGB video
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SAGE and TeleconferencingSupport of several systems
• Except for SAGE Visual Casting, a receiver box for each source will be used– Potentially support a large number of video
compression standards
University of Illinois at Chicago
Audio Afterthoughts
• Echo cancellation can be accomplished with AccuMic PC– Limitations …
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Audio Afterthoughts
• SAGE has to develop an audio standard for visual casting
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Persistent setupfirst pass
• DVCPRO HD using Qvidium boxes
• CALIT2 UCSD, Calit2 UCI, EVL
• AccuMic Echo calculation
• Mono simple PCM audio
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Near Future
• HDMI camera and capture card
• Multi-channel audio with each SAGE window
• Audio localization with each window
University of Illinois at Chicago
Teleconferencing
• Discussion