Setting pipeline to PAUSED ...
Pipeline is PREROLLING ...
ERROR: from element /playbin0/source: Internal data flow error.
Additional debug info:
gstbasesrc.c(1536): gst_base_src_loop (): /playbin0/source:
streaming task paused, reason not-linked
ERROR: pipeline doesn't want to preroll.
Setting pipeline to NULL ...
FREEING pipeline ...