frei0r-filter-perspective parameters? Found them but internal dataflow error

[Jos van Riswick]

trying this:

gst-launch v4l2src ! video/x-raw-yuv,width=320,height=240 !
ffmpegcolorspace !
frei0r-filter-perspective,top-left-X=10,top-left-Y=10,top-right-X=100,top-right-Y=100,bottom-left-X=10,bottom-left-Y=100,bottom-right-X=100,bottom-right-Y=100
! xvimagesink


ie view webcam and remove perspective distortion

First it complains it cannot find a file
/usr/share/opencv/haarcascades/haarcascade_frontalface_alt2.xml
but turns out to be an installation problem. After I get this from
some package however:...

reason not negotiated?


josvanr




Setting pipeline to PAUSED ...
Pipeline is live and does not need PREROLL ...
Setting pipeline to PLAYING ...
New clock: GstSystemClock
ERROR: from element /GstPipeline:pipeline0/GstV4l2Src:v4l2src0:
Internal data flow error.
Additional debug info:
gstbasesrc.c(2574): gst_base_src_loop ():
/GstPipeline:pipeline0/GstV4l2Src:v4l2src0:
streaming task paused, reason not-negotiated (-4)
Execution ended after 2507571638 ns.
Setting pipeline to PAUSED ...
Setting pipeline to READY ...
Setting pipeline to NULL ...
Freeing pipeline ...