How can I debug if play() returns StateChangeReturn.FAILURE

[martin-petzold]

My pipeline runs from command line: gst-launch-1.0 pylonsrc cam::OffsetX=1144 cam::OffsetY=1016 ! video/x-raw,format=YUY2,width=1920,height=1080,framerate=30/1 ! tee ! queue ! v4l2sink device=/dev/video9

However, using Gst.parseLaunch(...) and play() I get a StateChangeReturn.FAILURE.

I have no idea how to debug this, because there also does not seem to be Java log output.

[martin-petzold]

Use GLib.setEnv("GST_DEBUG", "4", true); before Gst.init(...); and check journal (stdout / stderr).