2020-01-08 gstreamer+graphviz

@ bash

$ sudo apt-get install graphviz
$ export GST_DEBUG_DUMP_DOT_DIR=~/tmp/

@ c file

GST_DEBUG_BIN_TO_DOT_FILE(pipeline, GST_DEBUG_GRAPH_SHOW_ALL, "pipeline");

@bash

$ cd  ~/tmp
$ dot -Tpdf pipeline.dot -o pipeline.pdf