[gst-devel] Issue while using DV Cam and overlay

Stefan de Konink skinkie at xs4all.nl
Fri Nov 11 03:48:47 CET 2005

On Fri, 11 Nov 2005, Thomas Vander Stichele wrote:

> On Tue, 2005-11-08 at 21:19 +0100, Stefan de Konink wrote:
> > We have a bit odd behavior, probably due to overlay use.
> >
> > When we have a DV Cam and using Theora, the remote PC is overlaying a
> > text. When I zoom/unzoom the cam the text moves for a sec likewise.
> >
> > Is this fixable?
> I'm trying to make sense of what you're saying here.  So some questions:
> - You don't specify what app.  What app ?

> - What is the remote PC ?
> - What are you doing ?
The PC that decodes the theora stream, zooms it to 640x480, overlays text
with the pango element, and displays it to ximagesrc.

tv at localhost ~ $ DISPLAY=:0 gst-launch-0.8 tcpclientsrc port=7860
protocol=1 ! oggdemux name=mux { mux. ! queue ! theoradec ! ffcolorspace !
! videoscale !
! textoverlay font-desc="Syntax Normal 20" halign="left" valign="bottom"
text="...........U kijkt naar de Raadsvergadering" ! xvimagesink }

I guess it has something to do with the videoscale before displaying it to

> - Are you sure whatever text you see is not just text from the OSD of
> the camera ?
No, the camera is pure used for video.

> Also, better not to reply to a thread to post a new topic.
What do you mean with this? Wasn't the subject new?


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