[gst-devel] Kaapow

[Julien Moutte]

You can use a transparent PNG it will respect transparency. Moreover you
can add the alpha element before videomixer and change the alpha
parameter to make the png transparent globally.

gst-launch-0.10 filesrc location=/home/dolphy/fluendo.png ! pngdec !
ffmpegcolorspace ! alpha alpha=0.50 !  videomixer name=mixer !
ffmpegcolorspace ! ximagesink videotestsrc ! ffmpegcolorspace ! mixer.

Julien.

On Fri, 2006-12-29 at 19:28 +0100, Jens Persson wrote:
> That worked perfectly mr Moutte. And while you're at it can you please 
> tell us how to get it transparent too?
> 
> greets Jens
> 
> Julien Moutte wrote:
> > You don't need freeze, look at this example launch line.
> >
> >
> > gst-launch-0.10 filesrc location=/home/dolphy/Desktop/ROCK1.png !
> > pngdec ! ffmpegcolorspace ! videomixer name=mixer ! ffmpegcolorspace !
> > ximagesink videotestsrc ! ffmpegcolorspace ! mixer.
> >
> >
> > ATTENTION: the order is important in the gst-launch line because you
> > can't control the Z order of the streams connected to the mixer. In your
> > application it's different. Enjoy..
> >
> > Julien.
> >
> > On Fri, 2006-12-29 at 15:13 +0000, Adam Lofts wrote:
> >   
> >> Hi,
> >>
> >> I'd like to announce a project I've had over the winter. Kaapow is a
> >> little python application for playing with webcams. It will display
> >> you webcam feed and allow you to apply effects to the feed (currently
> >> limited to the *tv elements, see below). The url is
> >> http://adam.uwcs.co.uk/kaapow. This should be fun for people with
> >> cameras built into laptops for example. 
> >>
> >> So the next step I want to take is to add an "overlay" effect to put a
> >> picture of a gorilla on top of the camera feed, so one can look at
> >> oneself being a gorilla (i.e. some of the image would be transparent).
> >> Unfortunately this is not as simple as sticking in an edgetv element
> >> and a colorspace. My gut reaction was this: 
> >>
> >> [ filesrc ! pngdec ! freeze ! ffmpegcolorspace ]
> >> [ feed going in ! ffmpegcolorspace ]
> >>
> >> both into 
> >>
> >> [ videomixer ! feed going out ]
> >>
> >> I do get one frame of output from this, with the image on top but then
> >> playing stops. I've also tried playing with pad probes to eat up EOS
> >> events but still no success. 
> >>
> >> Are there any example of doing this?
> >>
> >> Thanks,
> >> Adam
> >>
> >>
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