[gst-devel] Caps Setting

[Can Bal]

Hello everybody,

First I must say that I am new to GStreamer and try to write my first 
plugin/filter. My aim is to use videotestsrc to generate a video and 
filter only the random part (on the bottom right) and output only that 
section to the screen.

I know that I need to have different caps for the src and sink pads, so 
that xvimagesink negotiates with my filter and decides for a lower 
resolution than the resolution videotestsrc outputs. I have tried many 
things to do that (including fixing the src pad caps to the resolution I 
want in the template and in the _set_caps() function); but nothing works 
and I simply get the same resolution with the input at my output.

If you can give me some hints of the required steps to this, I would 
really appreciate. Thank you very much.

Best regards,
canbal