set caps in a program

[Thomas Scheuermann]

Hello,

How can I set caps in a program?
I want to do something like this:
gst-launch-1.0 videotestsrc pattern=0 !
"video/x-raw,width=1920,height=1080,framerate=60/1" ! xvimagesink
I create the videotestsrc element with gst_element_factory_make but I
don't know how I can then set the caps on the "src" pad of the
videotestsrc element.
Is there an example anywhere?

Regards,

Thomas
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