[gst-devel] help needed with video plugin

[Gustavo J A M Carneiro]

A Seg, 2003-04-21 às 21:42, Wim Taymans escreveu:
> On Mon, 2003-04-21 at 12:35, Gustavo J A M Carneiro wrote:
> >   I'm trying to make a plugin called 'textoverlay', which displays text
> > on top of a video frame buffer, for subtitles, etc.
> >   It is not even half finished.  I was just trying to do some drawing,
> > of some  white pixels, to see what happens.  Unfortunately, when I use
> > this plugin, nothing happens.  Even worse, the video does not reach the
> > output device.
> 
> Your plugin does not specify a complete GstCaps for the RGB video format
> (fe. the bitmaks are missing and the widht/height is not set). The
> videosink will in this case not know what to show, so nothing will
> happen.
> 
> I suggest to add a link function on the sinkpad that parses the
> widht/height of the incomming frames and use gst_pad_try_set_caps to
> forward this format on the srcpad (look at goom for example and adapt
> for the video format).

  Well, I just read for the first time the gstreamer manual 2 days ago. 
I'm a bit green with these things.  What I'm doing is take some plugins,
chop off the code I don't understand, and add my own code.  :)

  Thanks!  

> 
> Regards,
> 
> Wim
> 
> 
> >   Can someone experienced with these things please look at the code
> > (it's small).  Thanks!
-- 
Gustavo J. A. M. Carneiro
<gjc at inescporto.pt> <gustavo at users.sourceforge.net>