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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Bob do you have an MSDN subscription? If
not, let me know and I’ll take care of it as part of our general support
of AG.</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<div>
<p class=MsoAutoSig><font size=1 color=navy face=Tahoma><span style='font-size:
8.0pt;font-family:Tahoma;color:navy'>Todd Needham</span></font></p>
<p class=MsoAutoSig><font size=1 color=navy face=Tahoma><span style='font-size:
8.0pt;font-family:Tahoma;color:navy'>Manager, Research Programs Group</span></font></p>
<p class=MsoAutoSig><font size=1 color=navy face=Tahoma><span style='font-size:
8.0pt;font-family:Tahoma;color:navy'>Microsoft Research</span></font></p>
<p class=MsoAutoSig><font size=1 color=navy face=Tahoma><span style='font-size:
8.0pt;font-family:Tahoma;color:navy'>http://research.microsoft.com </span></font></p>
</div>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma'>-----Original Message-----<br>
<b><span style='font-weight:bold'>From:</span></b> Jay Beavers
[mailto:jbeavers@microsoft.com] <br>
<b><span style='font-weight:bold'>Sent:</span></b> Monday, July 23, 2001 7:40
AM<br>
<b><span style='font-weight:bold'>To:</span></b> Robert Olson; Andy Quay;
ag-tech@mcs.anl.gov<br>
<b><span style='font-weight:bold'>Subject:</span></b> RE: [AG-TECH] Hi-quality
video</span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> </span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'>Our stack has been
written from the ground up according to RFC 1889 just for this scenario.</span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'>Current FEC is primitive,
just the redundant transmission of packets. We’re working on a
parity packet scheme for the December release and will follow RFC 2733 unless
we hit a showstopper. RFC 2733 looks exactly like what we want to do so I
foresee no problems.</span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'>I get bits to my
application using the DirectShow SDK, where there are plenty of examples of
getting bits from a WDM source. If you want to talk to the WDM driver
directly, I would search in the Device Driver Kit for sample code.
I’ll be happy to get you the DDK for Windows 2000 or Windows XP.</span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'>We’re not doing
MPEG-4 encoding, Microsoft ships only an ISO MPEG-4 decoder in Windows
XP. We can source M-JPEG (and in the future MSVideo) streams.
We’re working on getting a contract in place to source h.261 and h.263
streams too.</span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal style='margin-left:1.0in'><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma'>-----Original Message-----<br>
<b><span style='font-weight:bold'>From:</span></b> Robert Olson
[mailto:olson@mcs.anl.gov] <br>
<b><span style='font-weight:bold'>Sent:</span></b> Monday, July 23, 2001 5:12
AM<br>
<b><span style='font-weight:bold'>To:</span></b> Jay Beavers; Andy Quay;
ag-tech@mcs.anl.gov<br>
<b><span style='font-weight:bold'>Subject:</span></b> RE: [AG-TECH] Hi-quality
video</span></font></p>
<p class=MsoNormal style='margin-left:1.0in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> </span></font></p>
<p class=MsoNormal style='margin-right:0in;margin-bottom:12.0pt;margin-left:
1.0in'><font size=3 face="Times New Roman"><span style='font-size:12.0pt'>At 03:52
PM 7/22/2001 -0700, Jay Beavers wrote:</span></font></p>
<p class=MsoNormal style='margin-left:1.0in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'>We are doing 640x480 @ 15 fps using Sony 1394 cameras,
encoding them<br>
using software M-JPEG, and transmitting them with a RTP stack that<br>
supports Forward Error Correction which we found to be a requirement<br>
when sending large frame video.</span></font></p>
<p class=MsoNormal style='margin-right:0in;margin-bottom:12.0pt;margin-left:
1.0in'><font size=3 face="Times New Roman"><span style='font-size:12.0pt'><br>
Which stack is this? I've not paid much attention to FEC, but that sounds cool.
Is it an RFC2733 (<a href="http://www.ietf.org/rfc/rfc2733.txt" eudora=autourl>http://www.ietf.org/rfc/rfc2733.txt</a>)
FEC stack?<br>
<br>
</span></font></p>
<p class=MsoNormal style='margin-left:1.0in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'>This system works side by side on the same box with
analog capture cards<br>
such as the Osprey 200 and Osprey 500 (which supports hardware<br>
deinterlacing of NTSC signals). We have found VIC quite unstable when<br>
transmitting (receiving is just fine) video streams under Windows 2000<br>
and Windows XP, so side by side on one computer is problematic at best<br>
because VIC keeps crashing. We've also found that VIC cannot deal with<br>
our 1394 camera drivers which are based on the newer capture API WDM<br>
(Windows Driver Model) instead of the older standard VfW (Video for<br>
Windows).</span></font></p>
<p class=MsoNormal style='margin-right:0in;margin-bottom:12.0pt;margin-left:
1.0in'><font size=3 face="Times New Roman"><span style='font-size:12.0pt'><br>
Found this about WDM:<br>
<br>
<a href="http://msdn.microsoft.com/library/en-us/dnwbgen/html/vidcap.asp"
eudora=autourl>http://msdn.microsoft.com/library/en-us/dnwbgen/html/vidcap.asp<br>
<br>
</a>Do you have a simple example of video capture under WDM, where the
application code ends up with the bits from the camera?<br>
<br>
</span></font></p>
<p class=MsoNormal style='margin-left:1.0in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'>We'll be releasing the RTP stack and a conference
management application<br>
in December per my previous message. By December, I hope to have<br>
support for not only M-JPEG (which is a bit of a CPU hog), but also ISO<br>
MPEG-4 (decoding) </span></font></p>
<p class=MsoNormal style='margin-left:1.0in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'><br>
What are you using for MPEG-4 encoding?<br>
<br>
--bob</span></font></p>
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