[AG-TECH] Hi-quality video

[Robert Olson]

We have experimented with motion jpeg via commodity Pinnacle DC10+ jpeg 
capture cards. They are inexpensive (<$100) and work well. We have a 
version of vic for Linux that works well with those cards, and the AG 
display vic uses the Intel JPEG Library to do realtime display of the JPEG 
stream.

The code is currently in flux, but we have a student working on making it 
robust this summer with an aim to distribute in the end of summer. The main 
goals of this work are to ensure the card works well in an AG capture 
machine alongside the BTTV-based capture cards and to get full 640x480 
decoding working on the display side. The challenge with this is that 
640x480 capture is implemented on-card by capturing and separately 
JPEG-encoding two 640x240 fields. The display does not currently know how 
to interlace these into a single 640x480 image. We currently throw away one 
of the fields and line-double (via DirectX) into a 640x480 image.

Another option is the JPEG work done by the folks at UC Berkeley 
(http://bmrc.berkeley.edu/~delco/rtptv/) using the LML33 cards. We've not 
used this too, only tested the receive side. Worked fine, modulo some 
network lossage.

What network bandwidths can your sites support? A single MJPEG stream is 
around 10-15 Mbps.

--bob

At 03:07 PM 7/22/2001 -0400, Andy Quay wrote:
>Let me clarify my question... We are building two AccessGrids and are in
>need of the ability to deliver 640x480 at 30 fps high quality streams
>(NTSC), such as MPEG-2 or M-JPEG, in addition to the traditional h.261 video
>streams used by the Access Grid today. Anybody have any ideas or experience?