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<title>GstParse: GStreamer 1.0 Core Reference Manual</title>
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Top  | 
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                  Description  | 
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                  Object Hierarchy
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Home
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Up
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Prev
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Next
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GstParse
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GstParse — Get a pipeline from a text pipeline description
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Functions
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GQuark
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gst_parse_error_quark ()
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GstElement *
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gst_parse_launch ()
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GstElement *
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gst_parse_launch_full ()
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GstElement *
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gst_parse_launchv ()
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GstElement *
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gst_parse_launchv_full ()
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GstElement *
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gst_parse_bin_from_description ()
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GstElement *
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gst_parse_bin_from_description_full ()
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GstParseContext *
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gst_parse_context_new ()
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GstParseContext *
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gst_parse_context_copy ()
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void
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gst_parse_context_free ()
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gchar **
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gst_parse_context_get_missing_elements ()
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Types and Values
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#define
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GST_PARSE_ERROR
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enum
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GstParseError
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GstParseContext
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enum
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GstParseFlags
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Object Hierarchy
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    GBoxed
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    ╰── GstParseContext
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Includes
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#include <gst/gst.h>
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Description
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These function allow to create a pipeline based on the syntax used in the
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gst-launch-1.0 utility (see man-page for syntax documentation).
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Please note that these functions take several measures to create
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somewhat dynamic pipelines. Due to that such pipelines are not always
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reusable (set the state to NULL and back to PLAYING).
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Functions
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gst_parse_error_quark ()
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GQuark
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gst_parse_error_quark (void);
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Get the error quark used by the parsing subsystem.
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Returns
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 the quark of the parse errors.
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gst_parse_launch ()
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GstElement *
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gst_parse_launch (const gchar *pipeline_description,
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                  GError **error);
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Create a new pipeline based on command line syntax.
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Please note that you might get a return value that is not NULL even though
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the error
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 is set. In this case there was a recoverable parsing error and you
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can try to play the pipeline.
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Parameters
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pipeline_description
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the command line describing the pipeline
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error
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the error message in case of an erroneous pipeline.
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Returns
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a new element on success, NULL on
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failure. If more than one toplevel element is specified by the
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pipeline_description
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, all elements are put into a GstPipeline, which
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than is returned.
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[transfer floating][nullable]
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gst_parse_launch_full ()
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GstElement *
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gst_parse_launch_full (const gchar *pipeline_description,
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                       GstParseContext *context,
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                       GstParseFlags flags,
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                       GError **error);
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Create a new pipeline based on command line syntax.
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Please note that you might get a return value that is not NULL even though
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the error
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 is set. In this case there was a recoverable parsing error and you
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can try to play the pipeline.
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Parameters
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pipeline_description
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the command line describing the pipeline
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context
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a parse context allocated with
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gst_parse_context_new(), or NULL.
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[allow-none]
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flags
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parsing options, or GST_PARSE_FLAG_NONE
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error
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the error message in case of an erroneous pipeline.
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Returns
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a new element on success, NULL on
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failure. If more than one toplevel element is specified by the
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pipeline_description
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, all elements are put into a GstPipeline, which
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then is returned (unless the GST_PARSE_FLAG_PLACE_IN_BIN flag is set, in
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which case they are put in a GstBin instead).
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[transfer floating][nullable]
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gst_parse_launchv ()
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GstElement *
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gst_parse_launchv (const gchar **argv,
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                   GError **error);
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Create a new element based on command line syntax.
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error
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 will contain an error message if an erroneous pipeline is specified.
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An error does not mean that the pipeline could not be constructed.
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Parameters
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argv
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null-terminated array of arguments.
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[in][array zero-terminated=1]
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error
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pointer to a GError
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Returns
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a new element on success and NULL
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on failure.
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[transfer floating][nullable]
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gst_parse_launchv_full ()
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GstElement *
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gst_parse_launchv_full (const gchar **argv,
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                        GstParseContext *context,
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                        GstParseFlags flags,
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                        GError **error);
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Create a new element based on command line syntax.
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error
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 will contain an error message if an erroneous pipeline is specified.
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An error does not mean that the pipeline could not be constructed.
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Parameters
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argv
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null-terminated array of arguments.
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[in][array zero-terminated=1]
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context
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a parse context allocated with
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gst_parse_context_new(), or NULL.
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[allow-none]
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flags
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parsing options, or GST_PARSE_FLAG_NONE
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error
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pointer to a GError (which must be initialised to NULL)
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Returns
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a new element on success; on
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failure, either NULL or a partially-constructed bin or element will be
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returned and error
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will be set (unless you passed
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GST_PARSE_FLAG_FATAL_ERRORS in flags
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, then NULL will always be returned
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on failure).
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[transfer floating][nullable]
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gst_parse_bin_from_description ()
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GstElement *
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gst_parse_bin_from_description (const gchar *bin_description,
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                                gboolean ghost_unlinked_pads,
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                                GError **err);
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This is a convenience wrapper around gst_parse_launch() to create a
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GstBin from a gst-launch-style pipeline description. See
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gst_parse_launch() and the gst-launch man page for details about the
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syntax. Ghost pads on the bin for unlinked source or sink pads
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within the bin can automatically be created (but only a maximum of
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one ghost pad for each direction will be created; if you expect
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multiple unlinked source pads or multiple unlinked sink pads
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and want them all ghosted, you will have to create the ghost pads
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yourself).
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Parameters
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bin_description
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command line describing the bin
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ghost_unlinked_pads
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whether to automatically create ghost pads
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for unlinked source or sink pads within the bin
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err
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where to store the error message in case of an error, or NULL
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Returns
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a
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newly-created bin, or NULL if an error occurred.
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[transfer floating][type Gst.Bin][nullable]
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gst_parse_bin_from_description_full ()
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GstElement *
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gst_parse_bin_from_description_full (const gchar *bin_description,
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                                     gboolean ghost_unlinked_pads,
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                                     GstParseContext *context,
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                                     GstParseFlags flags,
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                                     GError **err);
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This is a convenience wrapper around gst_parse_launch() to create a
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GstBin from a gst-launch-style pipeline description. See
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gst_parse_launch() and the gst-launch man page for details about the
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syntax. Ghost pads on the bin for unlinked source or sink pads
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within the bin can automatically be created (but only a maximum of
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one ghost pad for each direction will be created; if you expect
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multiple unlinked source pads or multiple unlinked sink pads
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and want them all ghosted, you will have to create the ghost pads
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yourself).
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Parameters
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bin_description
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command line describing the bin
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ghost_unlinked_pads
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whether to automatically create ghost pads
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for unlinked source or sink pads within the bin
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context
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a parse context allocated with
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gst_parse_context_new(), or NULL.
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[transfer none][allow-none]
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flags
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parsing options, or GST_PARSE_FLAG_NONE
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err
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where to store the error message in case of an error, or NULL
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Returns
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a newly-created
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element, which is guaranteed to be a bin unless
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GST_FLAG_NO_SINGLE_ELEMENT_BINS was passed, or NULL if an error
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occurred.
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[transfer floating][type Gst.Element][nullable]
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gst_parse_context_new ()
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GstParseContext *
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gst_parse_context_new (void);
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Allocates a parse context for use with gst_parse_launch_full() or
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gst_parse_launchv_full().
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Free-function: gst_parse_context_free
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Returns
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a newly-allocated parse context. Free
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with gst_parse_context_free() when no longer needed.
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[transfer full][nullable]
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gst_parse_context_copy ()
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GstParseContext *
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gst_parse_context_copy (const GstParseContext *context);
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Copies the context
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.
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Parameters
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context
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a GstParseContext
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Returns
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A copied GstParseContext.
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[transfer full][nullable]
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gst_parse_context_free ()
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void
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gst_parse_context_free (GstParseContext *context);
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Frees a parse context previously allocated with gst_parse_context_new().
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Parameters
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context
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a GstParseContext.
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[transfer full]
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gst_parse_context_get_missing_elements ()
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gchar **
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gst_parse_context_get_missing_elements
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                               (GstParseContext *context);
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Retrieve missing elements from a previous run of gst_parse_launch_full()
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or gst_parse_launchv_full(). Will only return results if an error code
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of GST_PARSE_ERROR_NO_SUCH_ELEMENT was returned.
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Parameters
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context
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a GstParseContext
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Returns
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a
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NULL-terminated array of element factory name strings of missing
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elements. Free with g_strfreev() when no longer needed.
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[transfer full][array zero-terminated=1][element-type gchar*][nullable]
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Types and Values
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GST_PARSE_ERROR
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#define GST_PARSE_ERROR gst_parse_error_quark ()
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Get access to the error quark of the parse subsystem.
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enum GstParseError
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The different parsing errors that can occur.
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Members
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GST_PARSE_ERROR_SYNTAX
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A syntax error occurred.
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GST_PARSE_ERROR_NO_SUCH_ELEMENT
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The description contained an unknown element
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GST_PARSE_ERROR_NO_SUCH_PROPERTY
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An element did not have a specified property
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GST_PARSE_ERROR_LINK
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There was an error linking two pads.
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GST_PARSE_ERROR_COULD_NOT_SET_PROPERTY
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There was an error setting a property
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GST_PARSE_ERROR_EMPTY_BIN
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An empty bin was specified.
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GST_PARSE_ERROR_EMPTY
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An empty description was specified
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GST_PARSE_ERROR_DELAYED_LINK
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A delayed link did not get resolved.
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GstParseContext
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typedef struct _GstParseContext GstParseContext;
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Opaque structure.
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enum GstParseFlags
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Parsing options.
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Members
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GST_PARSE_FLAG_NONE
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Do not use any special parsing options.
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GST_PARSE_FLAG_FATAL_ERRORS
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Always return NULL when an error occurs
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    (default behaviour is to return partially constructed bins or elements
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     in some cases)
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GST_PARSE_FLAG_NO_SINGLE_ELEMENT_BINS
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If a bin only has a single element,
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    just return the element.
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GST_PARSE_FLAG_PLACE_IN_BIN
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If more than one toplevel element is described
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    by the pipeline description string, put them in a GstBin instead of a
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    GstPipeline. (Since: 1.10)
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