parse_launch


Description:

public Element? parse_launch (string pipeline_description, ParseContext? context = null, ParseFlags flags = NONE) throws Error

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.

Example: Hello World:

// See http://docs.gstreamer.com/x/NwAF
// for a detailed description

public static int main (string[] args) {
// Initialize GStreamer:
Gst.init (ref args);


// Build the pipeline:
Gst.Element pipeline;
try {
pipeline = Gst.parse_launch ("playbin uri=http://docs.gstreamer.com/media/sintel_trailer-480p.webm");
} catch (Error e) {
stderr.printf ("Error: %s\n", e.message);
return 0;
}

// Start playing:
pipeline.set_state (Gst.State.PLAYING);

// Wait until error or EOS:
Gst.Bus bus = pipeline.get_bus ();
bus.timed_pop_filtered (Gst.CLOCK_TIME_NONE, Gst.MessageType.ERROR | Gst.MessageType.EOS);

// Free resources:
pipeline.set_state (Gst.State.NULL);

return 0;
}

valac --pkg gstreamer-1.0 hello-world.vala

Parameters:

pipeline_description

the command line describing the pipeline

context

a parse context allocated with ParseContext, or null

flags

parsing options, or NONE

Returns:

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 Pipeline, which then is returned (unless the GST_PARSE_FLAG_PLACE_IN_BIN flag is set, in which case they are put in a Bin instead).


Namespace: Gst
Package: gstreamer-1.0