you can find how to set environment variable to enable gstreamer log in
below link.
https://developer.ridgerun.com/wiki/index.php/GStreamer_Debugging
If you want to enable using gst-launch-1.0, enter command like below.
GST_DEBUG=*:5 gst-launch-1.0 playbin uri=http://blah blah~
enjoy gstreamer.
Jimmy.
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