I faced very strange condition when using playbin to overlay video on my gdkwindow. Start the app normally the pipeline could constructed succesfully but i got no video on my window. But after i set the GST_DEBUG=*:3 then start my app again i got the video on the window.
Whats the problem here exactly? My suspicion is, because i have gstreamer installed both on /usr/lib and /usr/local/lib, but i dont think it the issues. Any thought, idea how to solve this?