University of Illinois at Chicago Current Advanced Teleconferencing Solutions Dan Sandin EVL Feb 7 2006

University of Illinois at Chicago

CurrentAdvanced

Teleconferencing Solutions

Dan Sandin

EVLFeb 7 2006


HDV Teleconferencing

• Compression in camera– Use widely deployed HDV format– 1920 by 1080 I px but resolution < 1400 Bayer– 1200 by 720 p has less latency– Inter-frame Mpeg compression

• Latency– In practice > 2 sec round trip– Observed at evl > 4 sec with VLC <25 sec

• Bandwidth – 25Mbit each way with sound


HDV Teleconferencing

• Current State– VLC windows support – VLC Linux support ???– SVC needs audio decode

• Robert Luc ??

• Disadvantages– Huge latency > 2 sec round trip

• Advantages – Nearly done, cheep, Linux


DVCPRO HD Teleconferencing

• Compression in camera– Will be widely deployed HDV format– 1920 by 1080 px but resolution ~ 1600 Bayer– 24p 30 i– AG-HVX200 P2 HD camera – intra-frame Jpeg compression– ~ $6000

• Latency– In practice ??

• Bandwidth – 100 Mbit each way with sound


DVCPRO HD Teleconferencing

• Development– Need to test latency and quality– Need to develop software decode– I meet with Panasonic feb 8 06


HDSDI Teleconferencing

• No compression 4-2-2– Use widely deployed HD format– 1920 by 1080 x 30 hz Interlace

• Latency– In theory < 250ms round trip– calit2 installation predicted to be ~ 260 - 400ms

round trip– Needs to measured

• Bandwidth – > 1.5 Gbit each way with sound

• Could modify software to truncate 10bit to 8 bit <1Gbit



• Advantages– Use widely deployed HD format– Standard broadcast equipment– Potentially low latency – Best quality of currently contemplated systems

• Disadvantages– Lots of unnecessary bandwidth– Needs frame grabber (SDI) – Expensive to do at full rez ( with display)

• $24,000 gets you ~ 1400 lines• $64,000 gets you full 1920 lines



• Development at evl– Will purchase equipment in next weeks.– Two windows computers

• Transmit – HD10 Analog to HDSDI converter Analoge

component to HDSDI SMPTE-292 • $1,200

– Black Magic DeckLink HD Pro 4:2:2 for HDSDI to framebuffer

• $ 1,500 http://www.blackmagic-design.com/products/hd/ – Software that packet smpte-292 (need to find out

standard?)



• Receive– De-packet software to frame buffer– AJA Xena HS for framebuffer to HDSDI

• $ 1,800 http://www.aja.com/products_xena.html

– Some HDSDI to DVI or component box to get to display

– Other groups have frame buffer to computer display software that may be compatible?



• Development at evl– I imagine these HDSDI to frame buffer and

frame buffer to HDSDI do not have Linux drivers.

– Packetized smpte 292 should not be hard to decode and display

– We could use taravision boards to transmit in Linux.



• Development at evl, How do we fit in– Copy UW system and leave it independent– Linux receive network hd, display on sage– Jpeg or jpeg 2000 compression

• Use hardware acceleration


Varrier stereo Teleconferencing



• No Compression – Yuv 4-1-1– 640 480 by 30fps x 2 P– Compression possible– Small c mount cameras

• unibran Fire-i400™ • ~$500 each with lens

• Latency– In theory < 250ms round trip– In practice 330 ms round trip

• Bandwidth – 220Mb with sound each way



• Advantages – Stereo without glasses– Better than NTSC, great looking, life size images– Compression possible– EVL developed software environment with deep control– Computer interface 1394

• Latency– Good 330 ms– Can be made smaller goal is 200ms round trip

• Bandwidth – 220Mb with sound each way– Modest , can be made smaller



• Development – Currently deployable – Add compression– in process

• Recording playback combining with VR compression

• More video formats



• Development – Currently deployable – Add compression– in process

• Recording playback combining with VR compression

• More video formats

– Possible connection Use NVIDIA texture decompression for media file playback on SAGE SHD and bigger. 8 to 1 compression



• Development – Opportunities for more interoperation of

varrier and SAGE


GigE camera Teleconferencing

• GigE industrial camera – 1920 by 1080 by 30hz P by 12bits/component– Bayer pattern color so rez is about 2/3??



• GigE industrial camera – 1920 by 1080 by 30hz P by 12bits/component– Bayer pattern color so rez is lower than a 3 chip

camera – Compression possible– Small c mount cameras ~$5000 each

• Latency– rough measurement < 400 ms round trip– In practice need to measure round trip

• Bandwidth – ~800 Mb with out sound each way



• Development at evl – Windows demonstrated – Linux driver problems– Write our own drivers for Linux – Use windows drivers – Windows send Linux receive.

• Add compression


Teleconferencing

• discussion

Documents

University of Illinois at Chicago Current Advanced Teleconferencing Solutions Dan Sandin EVL Feb 7 2006