[gst-devel] Fwd: Video processing

[Olivier Aubert]

Hi all

> Could you be a little more precise please ?
> How do I modify the buffer ? How do I draw it on the screen after ?
> should I still declare my screen widget from appdata struct as a
> drawing area ?
FYI, I am planning (do not know exactly when) to develop a svgoverlay
plugin, which would allow to overlay a SVG content over a buffer, for
the same kind of usage (drawing shapes over the video). I have already
developped such a filter for vlc, and the structure of gstreamer should
make it easy.

I have also tried another way (using videomixer and feeding it the
output of gdkpixbufdec (which can decode SVG), but I did not manage
(yet) to make it work. I have tried variations around the following
pipeline:

videotestsrc ! video/x-raw-yuv,width=320, height=240 ! videomixer
name=mix ! ffmpegcolorspace ! xvimagesink filesrc location=/tmp/a.svg  !
gdkpixbufdec ! videoscale ! video/x-raw-rgb,width=320,height=240 !
ffmpegcolorspace ! alpha alpha=0.5 ! mix. 

Olivier