Hi John, On Mar 9, 2007, at 10:07 AM, John I Quebedeaux Jr wrote:
> Well, that camera does specify the type of output that Ultragrid > works with on that HD-SDI connection (SMPTE-292M output)... i > suspect then the details get down to the hardware on the computer > side and networking, etc. It has other outputs, but not IEE1394 > (firewire) which is where most HD cameras do onboard mpeg2 encoding/ > lag that Brian spoke of. I'm... guessing? that HD-SDI is uncompressed. correct, HD-SDI is the uncompressed HDTV format. And there are a number of HDTV capture cards on the market with HD-SDI input/output. The Centaurus card from www.dvs.de is the capture card the UltraGrid system currently supports. HDTV cameras with IEEE1394 output, provide an MPEG2 compressed HDTV stream. HDMI capture card/cameras becoming available is very interesting and I'd be very interested to see how they compare in performance with HD-SDI systems. > > My concerns in meetings get back to having an "environment" of > human presence @ multiple sites that can interface naturally - > which includes video sources from the front and back of the room > (what I call "environmental feedback") - typically called the > "presenter camera" in the back of an AG room. I can possibly see > having an HD camera in the front and back of the room to do this... > then maybe another for... i've always felt you can't have enough > cameras! > > -John Q. > > -- > John I. Quebedeaux, Jr.; Louisiana State University > Computer Manager LBRN; 131 Life Sciences Bldg. > e-mail: [email protected]; web: http://lbrn.lsu.edu > phone: 225-578-0062 / fax: 225-578-2597 > > > On Mar 8, 2007, at 4:11 PM, Colin Perkins wrote: > >> We've done some work with uncompressed HD conferencing which might >> be relevant: http://ultragrid.east.isi.edu/ >> Colin >> >> On 8 Mar 2007, at 21:14, Brian Corrie wrote: >>> Hi John, >>> >>> Interesting... Does anyone know anything about SDI HD capture >>> cards. We are looking at HD as well (but no direct experience >>> yet) and the trick seems to be to get video off of the camera >>> avoiding the onboard encoding of the video, which often adds >>> significant latency (which is not good for AG of course). Does >>> anyone know if the SDI out of this camera either has onboard >>> hardware encoding (so low latency) and/or whether the SDI out is >>> uncompressed video (I don't know anything about SDI other than >>> that it is a broadcast oriented standard). Since this is a video >>> conferencing camera one would assume the SDI is raw video (it >>> looks like it base on my reading). So once one gets it out of the >>> camera how does one get it to the computer... There must be an HD >>> SDI capture card available. >>> >>> We are looking at the Sony HDR-HC7 prosumer HD camcorder as a >>> possibility. They aren't available yet, but any day now... They >>> have HDMI out, which is uncompressed video. There is a HDMI >>> capture card that can handle raw uncompressed HD video at 1080i >>> available from Black Magic that looks promising... The camera is >>> around $1500 and the card is $250. >>> >>> http://www.blackmagic-design.com/products/intensity/ >>> >>> We are going to be purchasing this pair as soon as the camera is >>> available, so I will let everyone know how this works out. If it >>> does work its a pretty inexpensive HD solution! >>> >>> Cheers, >>> >>> Brian >>> >>> >>> John I Quebedeaux Jr wrote: >>>> Someone asked me about this camera for HD use on the AG: http:// >>>> www.picturephone.com/products/sony_evi_hd1.htm >>>> Anyone have any experience with it? I'm wondering if it was >>>> used, how to best "capture" it into a system for use on the >>>> AG... interest in using HD is high here. I'm more concerned >>>> about logistical issues with high resolution images on displays >>>> that don't have that much "resolution" space - particularly if >>>> several sites are involved. >>>> -John Q. >>>> -- >>>> John I. Quebedeaux, Jr.; Louisiana State University >>>> Computer Manager LBRN; 131 Life Sciences Bldg. >>>> e-mail: [email protected]; web: http://lbrn.lsu.edu >>>> phone: 225-578-0062 / fax: 225-578-2597 >>> >> >> >> >> -- >> Colin Perkins >> http://csperkins.org/ >> >> >
