Test the container

gst-launch-1.0 videotestsrc ! autovideosink
gst-launch-1.0 videotestsrc ! nvh264enc ! fakesink

Debug your pipelines

export GST_DEBUG_DUMP_DOT_DIR=/some/path/to/save/dot/files

Run a GStreamer pipeline

./gst_pipelines_diagrams.sh

Then check your pipeline diagrams at $GST_DEBUG_DUMP_DOT_DIR/diagrams.