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Original commit message from CVS: Make factual and grammatical corrections to man pages. Add simple description of pipelines.
180 lines
5.7 KiB
Groff
180 lines
5.7 KiB
Groff
.TH "GStreamer" "1" "March 2001"
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.SH "NAME"
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gst\-launch \- build and run a GStreamer pipeline
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.SH "SYNOPSIS"
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\fBgst\-launch\fR \fI[OPTION...]\fR PIPELINE\-DESCRIPTION
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.SH "DESCRIPTION"
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.LP
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\fIgst\-launch\fP is a tool that builds and runs basic
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\fIGStreamer\fP pipelines.
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In simple form, a PIPELINE\-DESCRIPTION is a list of
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elements separated by exclamation marks (!). Options may be appended to
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elements, in the form "option=value". A group of elements
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surrounded by curly braces {, } will be executed in a separate thread.
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Connections between non-consecutive elements are created by specifying
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a element names and pad names immediately before and after the
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exclamation mark, in the form "element0.sinkpad!element1.srcpad".
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The default name given to an element is the name of its class followed by
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an index. If the element names are omitted, the previous and next
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elements in the PIPELINE-DESCRIPTION will be used. If the pad names
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are omitted, a default pad of the correct type (source or sink) is
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found on the given element, typically named "src" or "sink".
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See the GStreamer documentation for a complete description of a
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a PIPELINE\-DESCRIPTION.
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.SH "EXAMPLES"
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The examples below assume that you have the correct plug-ins available.
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In general, "osssink" can be substituted with another audio output
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plug-in such as "esdsink", "alsasink", or "artsdsink". Likewise,
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"xvideosink" can be substituted with "sdlvideosink" or "aasink".
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.B Audio playback
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Play the mp3 music file "music.mp3" using a libmad-based plug-in and
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output to an OSS device:
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gst\-launch filesrc location=music.mp3 ! mad ! osssink
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Play an Ogg Vorbis format file:
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gst\-launch filesrc location=music.ogg ! vorbisfile ! osssink
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Play an mp3 file or stream retrieved via http:
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gst\-launch httpsrc location=http://domain.com/music.mp3 ! mad ! osssink
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Play an mp3 file or stream using GNOME\-VFS:
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gst\-launch gnomevfssrc location=music.mp3 ! mad ! osssink
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gst\-launch gnomevfssrc location=http://domain.com/music.mp3 ! mad ! osssink
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Use GNOME\-VFS to play an mp3 file located on an SMB server:
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gst\-launch gnomevfssrc location=smb://computer/music.mp3 ! mad ! osssink
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.B Format conversion
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Convert an mp3 music file to an Ogg Vorbis file:
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gst\-launch filesrc location=music.mp3 ! mad ! vorbisenc ! filesink location=music.ogg
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Alternatively, to convert to the FLAC format, use the command line:
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gst\-launch filesrc location=claptrap.mp3 ! mad ! flacenc ! filesink location=test.flac
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.B Other
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Plays a .WAV file:
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gst\-launch filesrc location=music.wav ! wavparse ! osssink
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Convert a .WAV file into Ogg Vorbis (or mp3) file:
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gst\-launch filesrc location=music.wav ! wavparse ! vorbisenc ! filesink location=music.ogg
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gst\-launch filesrc location=music.wav ! wavparse ! mpegaudio ! filesink location=music.mp3
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Alternatively, if you have lame installed (and have the lame plug-in),
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you can substitute lame for mpegaudio in the previous example. It gives
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better results than mpegaudio.
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Rip all tracks from compact disc and convert them into a single mp3 file:
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gst\-launch cdparanoia ! mpegaudio ! filesink location=cd.mp3
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Using gst\-inspect, it is possible to discover settings for cdparanoia
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that will tell it to rip individual tracks.
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Record sound from your audio input and encode it into an ogg file:
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gst\-launch osssrc ! vorbisenc ! filesink location=input.ogg
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.B Video
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Display only the video portion of an MPEG-1 video file, outputting to
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an X display window (The "queue" element is necessary to buffer data
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between the threads):
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gst\-launch filesrc location=JB_FF9_TheGravityOfLove.mpg ! mpegdemux video_%02d!src { queue ! mpeg2dec ! xvideosink }
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Display the video portion of a .vob file (used on DVDs), outputting to
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an SDL window:
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gst\-launch filesrc location=/flflfj.vob ! mpegdemux video_%02d!src { queue ! mpeg2dec ! sdlvideosink }
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Play both video and audio portions of an MPEG movie:
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gst\-launch filesrc location=movie.mpg ! mpegdemux video_%02d!src { queue ! mpeg2dec ! sdlvideosink } mpegdemux0.audio_%02d!src { queue ! mad ! osssink }
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Play an AVI movie:
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gst\-launch filesrc location=movie.avi ! avidemux video_%02d!src { queue ! windec ! sdlvideosink }
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.B Network streaming
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An MPEG\-1 system stream can be streamed via RTP from one machine to
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another. On the receiver, execute:
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gst\-launch rtprecv media_type=mpeg1_sys ! mpegdemux video_%02d!src { queue ! mpeg2dec ! xvideosink } mpegdemux0.audio_%02d!src { queue ! mad ! osssink }
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On the transmitter, execute:
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gst\-launch filesrc location=mpeg1system.mpeg ! mpegparse ! rtpsend ip=IPorHostname
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.B Diagnostic
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Generate a null stream and ignore it:
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gst\-launch fakesrc ! fakesink
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Generate a pure tone to test the audio output:
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gst\-launch sinesrc ! osssink
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Generate a familiar test pattern to test the video output:
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gst\-launch videotestsrc ! xvideosink
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.
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.SH "OPTIONS"
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.l
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\fIgst\-launch\fP accepts the following options:
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.TP 8
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.B \-\-help
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Print help synopsis and available FLAGS
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.TP 8
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.B \-\-silent
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Do not output status information
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.TP 8
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.B \-\-exclude=TYPE, \-XTYPE
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Do not output status information of TYPE
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.TP 8
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.B \-\-output=FILE, \-oFILE
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Save XML representation of pipeline to FILE and exit
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.TP 8
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.B \-\-gst\-info\-mask=FLAGS
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\fIGStreamer\fP info flags to set (list with \-\-help)
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.TP 8
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.B \-\-gst\-debug\-mask=FLAGS
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\fIGStreamer\fP debugging flags to set (list with \-\-help)
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.TP 8
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.B \-\-gst\-mask=FLAGS
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\fIGStreamer\fP info and debugging flags to set (list with \-\-help)
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.TP 8
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.B \-\-gst\-plugin\-spew
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\fIGStreamer\fP info flags to set
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Enable printout of errors while loading \fIGStreamer\fP plugins
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.TP 8
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.B \-\-gst\-plugin\-path=PATH
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Add directories separated with ':' to the plugin search path
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.SH "SEE ALSO"
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.BR gst\-complete (1),
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.BR gst\-register (1),
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.BR gst\-inspect (1)
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.SH "AUTHOR"
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The GStreamer team at http://gstreamer.net/
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