There was an error in my 'default' config string which has been solved =
in a separate branch. It should read:
"videotestsrc ! ffmpegcolorspace ! capsfilter =
caps=3Dvideo/x-raw-rgb,bpp=3D24 ! identity name=3Dartoolkit ! fakesink"
You might want to see if gst-launch is working with these settings. To =
really "see" just replace fakesink with autovideosink - I presume you =
choose the GStreamer video input for a reason, thus you should also have =
a glimpse at doc/video/index.html explaining how to use gst-launch =
pipeline descriptions. Important fixture in there are the capsfilter =
with using constrain to rgb and 24bit and the identity called artoolkit =
... everything else can get quite convoluted like this one:
"v4l2src device=3D/dev/video0 ! capsfilter =
caps=3Dvideo/x-raw-yuv,width=3D640,height=3D480,framerate=3D30/1 ! =
ffmpegcolorspace ! tee name=3Dt1 ! theoraenc ! oggmux ! queue ! filesink =
location=3Ddebug.ogg t1. ! queue ! capsfilter caps=3Dvideo/x-raw-rgb,bpp=3D=
24 =
! identity name=3Dartoolkit ! fakesink"
which records the raw video and additionally pipes it into artoolkit
Cheers,
Hartmut
Manuel Sch=F6lling wrote:
> Hi,
>
> I compiled ARToolkit on Gentoo Linux (2.6.26-tuxonice #2 SMP PREEMPT Sun =
> Sep 14 18:42:27 CEST 2008 x86_64 AMD Turion(tm) 64 X2 Mobile Technology =
> TL-50 AuthenticAMD GNU/Linux).
> The Philips Webcam works fine with mplayer but calling any program in =
> /usr/share/doc/ARToolKit-2.72.1/examples/ retruns:
> > No video config string supplied, using defaults.
> > libARvideo: GStreamer 0.10.20
> >
> > (<unknown>:22247): GStreamer-CRITICAL **: gst_parse_launch_full: =
> assertion `pipeline_description !=3D NULL' failed
> > Segmentation fault
>
> My gstreamer version is 0.10.20 and my webcam device is /dev/video0.
>
> Has anybody a hint how to solve this problem?
>
> Cheers,
> Manuel
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