Check gstreamer's pipeline in graph

Set env var to export .dot file:

export GST_DEBUG_DUMP_DOT_DIR=.

Run the pipeline:

gst-lauch ...

Some .dot files are generated:

0.00.01.122222900-gst-launch.NULL_READY.dot
0.00.02.404022214-gst-launch.READY_PAUSED.dot
0.00.02.435974120-gst-launch.PAUSED_PLAYING.dot
0.00.23.584625244-gst-launch.PLAYING_READY.dot

Usually I check "PAUSED_PLAYING" state. Use "dot" utility in Graphviz to generate the PNG file:

dot -Tpng XXX.dot -o XXX.png