Thanks Oliver, I looked into the code, it will be useful. Maybe we
will create a gstreamer element based on that.
Just for the record here is an example pipeline how to draw a
rectangle with user defined dimension on a camera live view:
gst-launch -v multifilesrc location=bg.png ! image/png,
framerate=25/1 ! pngdec ! ffmpegcolorspace ! alpha ! videoscale !
video/x-raw-yuv,width=320, height=240 ! videobox top=-80 left=-100
border-alpha=0 alpha=0.5 ! videocrop bottom=180 right=200 ! videomixer
name=mix ! ffmpegcolorspace ! xvimagesink rtspsrc
location="rtsp://.../axis-media/media.amp?videocodec=h264&clock=1&resolution=320x240"
! rtph264depay ! h264parse ! ffdec_h264 ! ffmpegcolorspace ! alpha !
mix.
On Thu, May 6, 2010 at 11:28 AM, Olivier Aubert
<
[hidden email]> wrote:
> On Thu, 2010-05-06 at 10:55 +0200, Kocsis Tibor wrote:
>> Hi,
>>
>> is there any easy way to draw something to the top of the picture? For
>> example a rectangle or a shape (with alpha channel?) specified by
>> coordinates.
>>
>> I assume it is possible with a properly cropped png and videomix
>> element, but what's the correct way to do something like this? Any
>> ideas and pipelines are welcome :)
> Correct, I do not know. But I have developed a SVG overlay plugin for
> gstreamer (in python), which perfectly fits the bill (draw shapes over
> the video). See
http://liris.cnrs.fr/olivier.aubert/svgoverlay.py for
> the code.
>
> Olivier
>
>
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