the command line describing the pipeline
a parse context allocated with gst_parse_context_new(), or %NULL
parsing options, or #GST_PARSE_FLAG_NONE
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 #GstPipeline, which then is returned (unless the GST_PARSE_FLAG_PLACE_IN_BIN flag is set, in which case they are put in a #GstBin instead).
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.