[AG-TECH] 2.2 video problems.

Douglas Kosovic douglask at itee.uq.edu.au
Sun Aug 15 20:06:29 CDT 2004

Hi Vic,

> So I had this linux box with 2.1.2 working just fine.
> Now that I have removed 2.1.2 and installed 2.2 I can't seem to get
> any video feed working.  I installed xawtv (wasn't installed for
> 2.1.2 -- but v4l2 was).
> When running a prog like xcam, I can see my video feed just fine.
> When I try using xawtv, however, I get a blank screen.  I've tried
> xawtv 3.54 to 3.93.

It would be better to test it with vic, which can be found in a subdir of
~/.AccessGrid/local_services/ , assuming you've enabled at least one of the
Video Services in AGTk.

Only v4lctl is used from xawtv, you could try the following to see if it
detects the input ports:
   /usr/bin/v4lctl -c /dev/video0 list

> I've seen some posts that say I should edit the videopath in
> /usr/lib/python2.2/site-packages/AccessGrid/Platform/unix/Config.py
> to point to /dev instead of /proc/video/dev.  I've done this, but it
> just makes the x11 feed disappear.

You might want to have a look at the following log:

or use the --debug switch with ServiceManager.py to see if there is any
useful diagnostic info.

The V4L devices might be busy (i.e. you have other applications accessing
the V4L devices) when the ServiceManager tries to interogate them for their
input ports.


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