university of illinois at chicago optiputer teleconferencing next steps dan sandin jan 2007
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![Page 1: University of Illinois at Chicago OptIPuter Teleconferencing Next Steps Dan Sandin Jan 2007](https://reader036.vdocuments.site/reader036/viewer/2022062801/56649e735503460f94b73097/html5/thumbnails/1.jpg)
University of Illinois at Chicago
OptIPuter
Teleconferencing Next Steps
Dan Sandin
Jan 2007
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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
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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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University of Illinois at Chicago
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
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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
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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
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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
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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
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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
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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 !
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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
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University of Illinois at Chicago
SAGE and Teleconferencing
• SAGE Visual casting supports YUV and RGB video
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University of Illinois at Chicago
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
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University of Illinois at Chicago
Audio Afterthoughts
• Echo cancellation can be accomplished with AccuMic PC– Limitations …
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University of Illinois at Chicago
Audio Afterthoughts
• SAGE has to develop an audio standard for visual casting
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University of Illinois at Chicago
Persistent setupfirst pass
• DVCPRO HD using Qvidium boxes
• CALIT2 UCSD, Calit2 UCI, EVL
• AccuMic Echo calculation
• Mono simple PCM audio
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University of Illinois at Chicago
Near Future
• HDMI camera and capture card
• Multi-channel audio with each SAGE window
• Audio localization with each window
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University of Illinois at Chicago
Teleconferencing
• Discussion