[PD] live pd patch mixed with Gem or pdp?

IOhannes m zmoelnig zmoelnig at iem.at
Mon Aug 30 17:44:21 CEST 2010

On 2010-08-30 17:04, John Harrison wrote:
> I'd like to take a patch from a pd window and mix it live with a Gem or pdp
> window. pdp_capture would have been the ticket, but I can't get it to
> compile and looking at the archives of this list, it doesn't seem like
> others have had luck with it either. Any other ideas for me?

a bit complicated, but you can do that by doing screenshots with
gstreamer, send it to a videoloopback device and read that (with pdp,
Gem, GridFlow or whatelse)

- get v4l2loopback (http://code.google.com/p/v4l2loopback/)
 compile, install, load the module
- get gst-v4l2loopback (http://github.com/umlaeute/gst-v4l2loopback)
 compile (need gst-plugin-base-dev), install

run the gstreamer-pipeline, e.g.
$ gst-launch ximagesrc use-damage=false startx=0 starty=0 endx=640
endy=480 ! queue ! ffmpegcolorspace ! v4l2loopback

access the video using [pix_video], [pdp_v4l2] [#camera] or cat

running here.
this of course only grabs a portion of the screen, rather than a window
and track that...


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