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OpenSolaris 2009.06 - man page for gst-launch (opensolaris section 1)

gst-launch(1)				  User Commands 			    gst-launch(1)

NAME
       gst-launch - build and run a GStreamer pipeline

SYNOPSIS
       gst-launch  [--exclude=type,type2,...]  [--no-fault]  [--messages] [-output=file] [--tags]
       [--trace] [--verbose] [--version] [gst-std-options] pipeline-description

DESCRIPTION
       gst-launch builds and runs basic GStreamer pipelines.

       In simple form, a pipeline-description is a list  of  elements  separated  by  exclamation
       marks (!). Properties can be appended to elements, in the form property=value.

       For  a  complete  description of possible values for pipeline-description, see the section
       Pipeline Description below or consult the GStreamer documentation.

       Please note that gst-launch is primarily a debugging tool for developers  and  users.  You
       should  not build applications on top of it.  For applications, use the gst_parse_launch()
       function of the GStreamer API as an easy way to construct pipelines from pipeline descrip-
       tions.

OPTIONS
       The following options are supported by gst-launch:

       -X, --exclude=type1,type2,...   Do not output status information of specified type.

       -m, --messages		       Output messages posted on the pipeline's bus.

       -f, --no-fault		       Do not install a fault handler.

       -o, -output-=file	       Save XML representation of pipeline to file, then exit.

       -t, --tags		       Output tags, also known as metadata.

       -T, --trace		       Print memory allocation trace, if enabled at compile time.

       -v, --verbose		       Output status information and property notifications.

       --version		       Print GStreamer version number.

       gst-std-options		       Standard  options  available  for  use with most GStreamer
				       applications.  See gst-std-options(5)  for  more  informa-
				       tion.

EXTENDED DESCRIPTION
   Pipeline Description
       A  pipeline consists elements and links. elements can be put into bins of different sorts.
       elements, links and bins can be specified in a pipeline description in any order.

   Elements
       elementtype [property1 ...]

       Creates an element of type elementtype and sets the properties.

   Properties
       property=value ...

       Sets the property to the specified value. You can use gst-inspect(1)  to  find  out  about
       properties and allowed values of different elements.

       Enumeration properties can be set by name, nick or value.

   Bins
       [bintype.] ( [property1 ...] pipeline-description )

       Specifies  that	a  bin of type bintype is created and the given properties are set. Every
       element between the braces is put into the bin. Please note the dot that has  to  be  used
       after the bintype. You will almost never need this functionality, it is only really useful
       for applications using the gst_launch_parse() API with 'bin' as bintype. That  way  it  is
       possible to build partial pipelines instead of a full-fledged top-level pipeline.

   Links
       [[srcelement].[pad1,...]] ! [[sinkelement].[pad1,...]]
       [[srcelement].[pad1,...]] ! caps !
       [[sinkelement].[pad1,...]]

       Links  the  element  with  name srcelement to the element with name sinkelement, using the
       caps specified in caps as a filter. Names can be set on elements with the  name	property.
       If  the	name is omitted, the element that was specified directly in front of or after the
       link is used. This works across bins.  If a padname is given, the link is done with  these
       pads.  If  no  pad names are given all possibilities are tried and a matching pad is used.
       If multiple padnames are given, both sides must have the same number of pads specified and
       multiple  links are done in the given order.  So the simplest link is a simple exclamation
       mark, that links the element to the left of it to the element right of it.

   Caps
       mimetype [, property[, property ...]]] [; caps[; caps ...]]

       Creates a capability with the given mimetype and optionally  with  given  properties.  The
       mimetype  can be escaped using " or '. If you want to chain caps, you can add more caps in
       the same format afterwards.

   Properties
       name[:type]=value
       in lists and ranges: [type=]value

       Sets the requested property in capabilities. The name is an  alphanumeric  value  and  the
       type can have the following case-insensitive values:

	 o  i or int for integer values or ranges

	 o  f or float for float values or ranges

	 o  4 or fourcc for FOURCC values

	 o  b, bool, or boolean for boolean values

	 o  s, str, or string for strings

	 o
	    l or list for lists

       If  no  type  was  given,  the  following order is tried: integer, float, boolean, string.
       Integer values must be parsable by strtol(), floats by strtod(). FOURCC values may  either
       be  integers or strings.  Boolean values are (case insensitive) yes, no, true or false and
       may like strings be escaped with " or '.

       Ranges are in this format:  [ property, property ]
       Lists use this format:	   ( property [, property ...] )

   Pipeline Control
       A pipeline can be controlled by signals. SIGUSR2 will stop the pipeline	(GST_STATE_NULL);
       SIGUSR1	will put it back to play (GST_STATE_PLAYING). By default, the pipeline will start
       in the playing state.  There are currently no signals defined to  go  into  the	ready  or
       pause (GST_STATE_READY and GST_STATE_PAUSED) state explicitly.

EXAMPLES
       The  examples  below  assume  that  you	have  the correct plugins available.  In general,
       "sunaudiosink" can be substituted with another audio  output  plugin  such  as  "esdsink",
       "alsasink",  "osxaudiosink",  or  "artsdsink".  Likewise, "xvimagesink" can be substituted
       with "ximagesink", "sdlvideosink", "osxvideosink", or "aasink".	Keep in mind though  that
       different sinks might accept different formats and even the same sink might accept differ-
       ent formats on different machines, so you might need to add converter elements like audio-
       convert and audioresample (for audio) or ffmpegcolorspace (for video) in front of the sink
       to make things work.

       Example 1: Audio Playback

       Play the WAV music file "music.wav":

       example% gst-launch filesrc location=music.wav ! wavparse ! sunaudiosink

       Play the mp3 music file "music.mp3":

       example% gst-launch filesrc location=music.mp3 ! flump3dec ! sunaudiosink

       Play the Ogg Vorbis file "music.ogg":

       example% gst-launch filesrc location=music.ogg ! oggdemux ! vorbisdec ! audioconvert ! sunaudiosink

       Play an mp3 file or an http stream using GNOME-VFS:

       example% gst-launch gnomevfssrc location=music.mp3 ! flump3dec ! sunaudiosink

       example% gst-launch gnomevfssrc location=http://domain.com/music.mp3 ! flump3dec ! sunaudiosink

       Use GNOME-VFS to play an mp3 file located on an SMB server:

       example% gst-launch gnomevfssrc location=smb://computer/music.mp3 ! flump3dec ! sunaudiosink

       Example 2: Video Playback

       Play an Ogg video file:

       example% gst-launch filesrc location=video.ogg ! oggdemux ! theoradec ! ffmpegcolorspace ! xvimagesink

       Example 3: Format Conversion

       Convert an mp3 music file to the Ogg Vorbis format:

       example% gst-launch filesrc location=music.mp3 ! flump3dec ! audioconvert ! vorbisenc ! oggmux ! filesink location=music.ogg

       Convert an mp3 music file to the FLAC format:

       example% gst-launch filesrc location=music.mp3 ! flump3dec ! audioconvert ! flacenc ! filesink location=test.flac

       Convert a .WAV file to the Ogg Vorbis format:

       example% gst-launch filesrc location=music.wav ! wavparse ! audioconvert ! vorbisenc ! oggmux ! filesink location=music.ogg

       Example 4: Recording Audio

       Record sound from your audio input and encode it into an Ogg file:

       example% gst-launch sunaudiosrc ! audioconvert ! vorbisenc ! oggmux ! filesink location=music.ogg

       Example 5: Compact Disk (CDDA)

       Play track number 3 from compact disc:

       example% gst-launch cddasrc track=3 ! sunaudiosink

       Play track number 5 from compact disc:

       example% gst-launch cdda://5 ! sunaudiosink

       Example 6: Diagnostic

       Generate a null stream and ignore it:

       example% gst-launch fakesrc ! fakesink

       Generate a pure tone to test the audio output:

       example% gst-launch audiotestsrc ! sunaudiosink

       Generate a familiar test pattern to test the video output:

       example% gst-launch videotestsrc ! xvimagesink

       Generate a familiar test pattern to test the video output:

       example% gst-launch videotestsrc ! ximagesink

       Example 7: Automatic Linking

       You can use the decodebin element  to  automatically  select the right elements to  get	a
       working pipeline.

       Play any supported audio format:

       example% gst-launch filesrc location=musicfile ! decodebin ! sunaudiosink

       Play  any  supported video format with video and audio output.  Threads are used automati-
       cally.

       example% gst-launch filesrc location=videofile ! decodebin name=decoder decoder. ! queue ! audioconvert ! audioresample ! osssink decoder. ! ffmpegcolorspace ! xvimagesink

       To make this even easier, you can use the playbin element:

       example% gst-launch playbin uri=file:///home/joe/foo.avi

       Example 8: Filtered Connections

       These examples show how to use filtered capabilities.

       Show a test image and use the YUY2 or YV12 video format for this:

       example% gst-launch videotestsrc ! video/x-raw-yuv,format=urcc)YUY2;video/x-raw-yuv,format=urcc)YV12 ! xvimagesink

       Record audio and write it to a .wav file.  Force usage of signed 16 to 32 bit samples  and
       a sample rate between 32kHz and 64KHz:

       example% gst-launch sunaudiosrc ! 'audio/x-raw-int,rate=[32000,64000],width=[16,32],depth={16,24,32},signed=(boolean)true' ! wavenc ! filesink location=recording.wav

FILES
       The following files are used by this application:

       /usr/bin/gst-launch     Executable to build and run a GStreamer pipeline

       ~/gstreamer-0.10/registrGStreamer registry

ATTRIBUTES
       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWgnome-media		   |
       +-----------------------------+-----------------------------+
       |Interface stability	     |Volatile			   |
       +-----------------------------+-----------------------------+

SEE ALSO
       gst-feedback(1),  gst-inspect(1),  gst-typefind(1),  gst-xmlinspect(1),	gst-xmllaunch(1),
       gstreamer-properties(1), libgstreamer-0.10(3), attributes(5), gst-std-options(5)

NOTES
       Original man page written by the GStreamer team at http://www.gstreamer.net/.

       Updated by Brian Cameron, Sun Microsystems Inc., 2004, 2006, 2007.

SunOS 5.11				   12 Nov 2007				    gst-launch(1)


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