[AG-DEV] Identity certificates

[Luis Galárraga]

Our problem is that it seems VIC does not recognize the connected webcams.
We did the test in four computers: two laptops with Ubuntu 7.10, one laptop
and a PC with Windows XP. In all cases cameras were tested and recognized by
other applications: Cheese, aMSN and VLC in Ubuntu Linux, VLC and Windows
Messenger in Windows. VLC did not recognize it automatically in Linux so we
had to provide the name of the device file.

Then we ran the Venue Client and entered a venue. VIC and RAT started
running as expected and audio could be transmitted without any problem, VIC
only showed a "Waiting for video" message. When pressing the Menu button in
VIC window, we realized that "Transmit button" was disabled in all
computers. I read that happens when video capture hardware is not properly
configured. We are looking for a way of telling vic the path to the device
file of the camera, but no success until now. By the way, these are the
webcams we used: Creative VF0050, Genius VideoCam Messenger and VGA Matrix
Webcam.

We also did another tests transmitting multicast camera streams with vlc
with relative success (when transmitting from Windows, there were several
problems, VLC frequently froze; in Linux complete happiness)

In relation with the add-on services you mentioned, those are good news for
us, as we want to provide both Windows and Linux users a simple way to
participate in our webinars. Another question:  Where can we found the most
updated vic and rat documentation?

Thanks in advance,
Luis

2008/3/14, Thomas D. Uram <turam at mcs.anl.gov>:
>
>
> Luis:
>
> The video capture machine has, in the past, often run Linux, which is why
> you got that impression from looking at older documentation.
>
> In AG3, vic can use USB cameras, firewire cameras, and dedicated capture
> cards with either a VFW (older) or WDM/DirectShow (newer) driver.  You
> should be having success in either of these cases.  If you're not, we need
> to look into the cause a little deeper.  Provide more details of the
> problems you ran into, and your configuration, and I/we can help.
>
> There are add-on services for transmitting/receiving video using VLC (
> http://netmedia.gist.ac.kr/agdv/download.html).  These have so far only
> been made available on Windows, but it would be trivial to make them also
> work under Linux (with VLC; DVTS would be more difficult).
>
> Tom
>
>
> On 3/13/08 10:07 AM, Luis Galárraga wrote:
>
> Thanks a lot for your help Tom. I have two additional questions, but they
> related to audio and video transmision. As I mentioned, our objective are
> single node users which should have just a webcam and a microphone to
> participate in a webinar. People here in ESPOL (colleagues but not members
> of this project), have successfully tested AG in node configuration, but
> when we tried with a single computer, we could not transmit video. Worried
> about this fact, I read all documentation about VIC and understood that it
> requires a video capture card (our colleagues had one) for transmitting
> video. Reviews and documentation about node configurations indicate that the
> video capture computer should be a Linux machine with a video capture card
> and that only in Windows it is possible do it with a usb webcam or a
> firewire camera (no video card needed). Our tests were in both platforms
> without success. Do Linux users need a frame grabber for transmit video? Is
> it possible to use another tool like VLC for transmitting video? We had
> successful results transmitting multicast video streams from a webcam using
> VLC in Ubuntu Linux and Windows XP. In addition, we found a way of
> redirecting raw video to another application instead of showing it with VLC.
>
>
> Thanks again.
>
> Luis,
>
> 2008/3/13, Thomas D. Uram <turam at mcs.anl.gov>:
> >
> > Hi Luis:
> >
> > There are a few things you need to know in this regard:
> >
> > - By default, AG3 venues do not require that clients have a certificate
> > to enter.  Venues can be optionally configured to require a certificate,
> > in which case the user must present a certificate that satisfies the
> > access controls on the venue.
> >
> > - You can run your own CA and issue your own certificates.  In that
> > case, you'll need to make sure your clients have both your CA
> > certificate and their personal certificate.
> >
> > Otherwise, this is general PKI.  If you have other questions, don't
> > hesitate to ask.
> >
> > Tom
> >
> >
> > On 3/6/08 3:41 PM, Luis Galárraga wrote:
> > > Greetings:
> > >
> > > I am part of project for developing a webinar infraestructure based on
> > > Access Grid. After a long discussion in which suggestions in this
> > > mailing list were strongly considered, we have decided to implement a
> > > simple client for venues (in servers 3.x) using Java Web Start Apps.
> > > As you can see, there are many things to do, and developers have
> > > started by making tests with the soap interfaces in the our AG server,
> > > however they are not clear about the  concepts behind the
> > > authentication process. We know AG uses digital certificates for
> > > everything: users and services and those certificates are generated by
> > > AG developers (after a process request). Can our developer team
> > > generate certificates signed by us or it is required your sign?
> > > Several people in our university will probably use the system so we
> > > would like to have the privilege to generate the certificates. Could
> > > someone explain us in a better way, the technical issues behind
> > > authentication based on certificates (= how you implemented it)?. I
> > > hope you can help us.
> > >
> > > Thanks in advance,
> > >
> > > Regards,
> > > Luis Galárraga
> >
>
>
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