the command line describing the pipeline
a new element on success, NULL on failure. If more than one toplevel element is specified by the pipeline_description, all elements are put into a gstreamer.Pipeline, which than is returned.
GException on failure.
Create a new pipeline based on command line syntax. Please note that you might get a return value that is not NULL even though the error is set. In this case there was a recoverable parsing error and you can try to play the pipeline.