Setting gstreamer capsfilter with OpenCV in c++

[nevixa]

With the Microsoft LifeCam Cinema (on Ubuntu) in guvcview I get 30fps on
1280x720. In my OpenCV program, I only get 10fps (only queryframe and
showimage, no image processing is done). I found out that it is a 'problem'
in gstreamer (https://bugzilla.gnome.org/show_bug.cgi?id=676093). A solution
is to set a capsfilter in gstreamer, in terminal I can do it like this:

gst-launch v4l2src device=/dev/video0 !
'video/x-raw-yuv,width=1280,height=720,framerate=30/1' ! xvimagesink

This works! The question is:

- How do I implement this in my c++/OpenCV program?
- Or is it possible to set gstreamer to always use this capsfilter to force
30 fps?

I already found this 
http://stackoverflow.com/questions/6022423/mjpeg-streaming-and-decoding Q&A
, but I can't get it working with a webcam.

All ideas/sugestions would be really welcome!


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