[gst-devel] Setting pad properties at commandline

Stefan Kost ensonic at hora-obscura.de
Wed Oct 17 19:41:29 CEST 2007


Sameer Naik schrieb:
> hi,
> im writing a n-1 element, and am using the videomixer plugin (from
> gst-plugins-good package) to get the plug-in architecture in place.
> in the videomixer plugin, i see that the gstpad object is overloaded and
> a new videomixerpad object is created to store information information
> about each input pad.
> the videomixerpad class has the following properties installed on it:
> alpha, xpos, ypos,...
> but if i run the following pipeline:
> gst-launch videotestsrc ! video/x-raw-yuv, xpos=320, ypos=240,
> alpha=0.1 ! ffmpegcolorspace ! xvimagesink

#1 there is no videomix there.
#2 you cannot specify pad-proerties on capsfilter - it simple does not make sense

Videomixer should implement the childproxy iface. Then you can do:
gst-launch videotestsrc ! videomixer src_00::xpos=320 src_00::ypos=240
src_00::alpha=0.1 ! ffmpegcolorspace ! xvimagesink

Its not difficult, do you wanna try?


> no change appears at the displayed output, or to the properties of the
> pad.
> is it that the pad properties cannot be set in the above manner. if so,
> is there a way to set the pad properties at the command line level.
> regards
> ~sameer
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