GStreamer(1)                 General Commands Manual                GStreamer(1)

       gst-launch - build and run a GStreamer pipeline

       gst-launch [OPTION...] PIPELINE-DESCRIPTION

       gst-launch is a tool that builds and runs basic GStreamer pipelines.

       In simple form, a PIPELINE-DESCRIPTION is a list of elements separated by
       exclamation marks (!).  Options may be appended to elements, in the form
       "option=value".  A group of elements surrounded by curly braces {, } will
       be executed in a separate thread.

       Connections between non-consecutive elements are created by specifying a
       element names and pad names immediately before and after the exclamation
       mark, in the form "element0.sinkpad!element1.srcpad".  The default name
       given to an element is the name of its class followed by an index.  If
       the element names are omitted, the previous and next elements in the
       PIPELINE-DESCRIPTION will be used.  If the pad names are omitted, a
       default pad of the correct type (source or sink) is found on the given
       element, typically named "src" or "sink".

       See the GStreamer documentation for a complete description of a a

       The examples below assume that you have the correct plug-ins available.
       In general, "osssink" can be substituted with another audio output plug-
       in such as "esdsink", "alsasink", or "artsdsink".  Likewise, "xvideosink"
       can be substituted with "sdlvideosink" or "aasink".

       Audio playback

       Play the mp3 music file "music.mp3" using a libmad-based plug-in and
       output to an OSS device:

            gst-launch filesrc location=music.mp3 ! mad ! osssink

       Play an Ogg Vorbis format file:

            gst-launch filesrc location=music.ogg ! vorbisfile ! osssink

       Play an mp3 file or stream retrieved via http:

            gst-launch httpsrc location= ! mad !

       Play an mp3 file or stream using GNOME-VFS:

            gst-launch gnomevfssrc location=music.mp3 ! mad ! osssink

            gst-launch gnomevfssrc location= ! mad !

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

            gst-launch gnomevfssrc location=smb://computer/music.mp3 ! mad !

       Format conversion

       Convert an mp3 music file to an Ogg Vorbis file:

            gst-launch filesrc location=music.mp3 ! mad ! vorbisenc ! filesink

       Alternatively, to convert to the FLAC format, use the command line:

            gst-launch filesrc location=claptrap.mp3 ! mad ! flacenc ! filesink


       Plays a .WAV file:

            gst-launch filesrc location=music.wav ! wavparse ! osssink

       Convert a .WAV file into Ogg Vorbis (or mp3) file:

            gst-launch filesrc location=music.wav ! wavparse ! vorbisenc !
       filesink location=music.ogg

            gst-launch filesrc location=music.wav ! wavparse ! mpegaudio !
       filesink location=music.mp3

       Alternatively, if you have lame installed (and have the lame plug-in),
       you can substitute lame for mpegaudio in the previous example.  It gives
       better results than mpegaudio.

       Rip all tracks from compact disc and convert them into a single mp3 file:

            gst-launch cdparanoia ! mpegaudio ! filesink location=cd.mp3

       Using gst-inspect, it is possible to discover settings for cdparanoia
       that will tell it to rip individual tracks.

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

            gst-launch osssrc ! vorbisenc ! filesink location=input.ogg


       Display only the video portion of an MPEG-1 video file, outputting to an
       X display window (The "queue" element is necessary to buffer data between
       the threads):

            gst-launch filesrc location=JB_FF9_TheGravityOfLove.mpg ! mpegdemux
       video_%02d!src { queue ! mpeg2dec ! xvideosink }

       Display the video portion of a .vob file (used on DVDs), outputting to an
       SDL window:

            gst-launch filesrc location=/flflfj.vob ! mpegdemux video_%02d!src {
       queue ! mpeg2dec ! sdlvideosink }

       Play both video and audio portions of an MPEG movie:

            gst-launch filesrc location=movie.mpg ! mpegdemux video_%02d!src {
       queue ! mpeg2dec ! sdlvideosink } mpegdemux0.audio_%02d!src { queue ! mad
       ! osssink }

       Play an AVI movie:

            gst-launch filesrc location=movie.avi ! avidemux video_%02d!src {
       queue ! windec ! sdlvideosink }

       Network streaming

       An MPEG-1 system stream can be streamed via RTP from one machine to
       another.  On the receiver, execute:

            gst-launch rtprecv media_type=mpeg1_sys ! mpegdemux video_%02d!src {
       queue ! mpeg2dec ! xvideosink } mpegdemux0.audio_%02d!src { queue ! mad !
       osssink }

       On the transmitter, execute:

            gst-launch filesrc location=mpeg1system.mpeg ! mpegparse ! rtpsend


       Generate a null stream and ignore it:

            gst-launch fakesrc ! fakesink

       Generate a pure tone to test the audio output:

            gst-launch sinesrc ! osssink

       Generate a familiar test pattern to test the video output:

            gst-launch videotestsrc ! xvideosink

       gst-launch accepts the following options:

       --help  Print help synopsis and available FLAGS

               Do not output status information

       --exclude=TYPE, -XTYPE
               Do not output status information of TYPE

       --output=FILE, -oFILE
               Save XML representation of pipeline to FILE and exit

               GStreamer info flags to set (list with --help)

               GStreamer debugging flags to set (list with --help)

               GStreamer info and debugging flags to set (list with --help)

               GStreamer info flags to set Enable printout of errors while
               loading GStreamer plugins

               Add directories separated with ':' to the plugin search path

       gst-complete(1), gst-register(1), gst-inspect(1)

       The GStreamer team at

                                   March 2001                       GStreamer(1)