1 .TH "GStreamer" "1" "April 2003"
3 gst\-launch \- build and run a GStreamer pipeline
5 \fBgst\-launch\fR \fI[OPTION...]\fR PIPELINE\-DESCRIPTION
8 \fIgst\-launch\fP is a tool that builds and runs basic
9 \fIGStreamer\fP pipelines.
11 In simple form, a PIPELINE\-DESCRIPTION is a list of
12 elements separated by exclamation marks (!). Properties may be appended to
13 elements, in the form \fIproperty=value\fR.
15 For a complete description of possible PIPELINE-DESCRIPTIONS see above under
16 \fIpipeline description\fR or the GStreamer documentation.
21 \fIgst\-launch\fP accepts the following options:
24 Print help synopsis and available FLAGS
27 Output status information
29 .B \-XTYPE, \-\-exclude=TYPE,
30 Do not output status information of TYPE
32 .B \-oFILE, \-\-output=FILE
33 Save XML representation of pipeline to FILE and exit
36 Do not install a fault handler
39 Print memory allocation traces. The feature must be enabled at compile time to
42 .B \-i, \-\-iterations=N
43 Stop processing after N iterations.
46 .SH "GSTREAMER OPTIONS"
48 \fIgst\-launch\fP also accepts the following options that are common
49 to all GStreamer applications:
52 Prints the version string of the \fIGStreamer\fP core library.
54 .B \-\-gst\-fatal\-warnings
55 Causes \fIGStreamer\fP to abort if a warning message occurs.
57 .B \-\-gst\-debug=STRING
58 \fIGStreamer\fP debugging flags to set (list with \-\-gst\-mask\-help)
60 .B \-\-gst\-debug\-level=LEVEL
61 Sets the threshold for printing debugging messages. A higher level
62 will print more messages. The useful range is 0-5, with the default
65 .B \-\-gst\-debug\-no\-color
66 \fIGStreamer\fP normally prints debugging messages so that the
67 messages are color-coded when printed to a terminal that handles
68 ANSI escape sequences. Using this option causes \fIGstreamer\fP
69 to print messages without color.
71 .B \-\-gst\-disable\-debug
74 .B \-\-gst\-debug\-help
75 Prints a list of available debug categories and their default debugging level.
77 .B \-\-gst\-disable\-cpu\-opt
78 \fIGStreamer\fP normally automatically detects the capabilities of the
79 current CPU and selects the optimal implementation for some functions.
80 Using this flag disables detection, which is useful for debugging.
82 .B \-\-gst\-plugin\-spew
83 \fIGStreamer\fP info flags to set
84 Enable printout of errors while loading \fIGStreamer\fP plugins
86 .B \-\-gst\-plugin\-path=PATH
87 Add directories separated with ':' to the plugin search path
89 .B \-\-gst\-plugin\-load=PLUGINS
90 Preload plugins specified in a comma-separated list. Another way to specify
91 plugins to preload is to use the environment variable GST_PLUGIN_PATH
93 .B \-\-gst\-scheduler=SCHEDULER
94 Use SCHEDULER as the default scheduler
96 .B \-\-gst\-registry=REGISTRY
97 Use the file REGISTRY as registry instead of the default
99 .SH "PIPELINE DESCRIPTION"
101 A pipeline consists \fIelements\fR and \fIlinks\fR. \fIElements\fR can be put
102 into \fIbins\fR of different sorts. \fIElements\fR, \fIlinks\fR and \fIbins\fR
103 can be specified in a pipeline description in any order.
107 ELEMENTTYPE \fI[PROPERTY1 ...]\fR
109 Creates an element of type ELEMENTTYPE and sets the PROPERTIES.
115 Sets the property to the specified value. You can use \fBgst\-inspect\fR(1) to
116 find out about properties and allowed values of different elements.
118 Enumeration properties can be set by name, nick or value.
122 \fI[BINTYPE.]\fR ( \fI[PROPERTY1 ...]\fR PIPELINE-DESCRIPTION )
124 { \fI[PROPERTY1 ...]\fR PIPELINE-DESCRIPTION }
126 Specifies that a bin of type BINTYPE is created and the given properties are
127 set. Every element between the braces is put into the bin. Using curly braces
128 (second line) is a short cut for using the first line and "thread" as the
131 Please not the dot that has to be used after the BINTYPE.
135 \fI[[SRCELEMENT].[PAD1,...]]\fR ! \fI[[SINKELEMENT].[PAD1,...]]\fR
136 \fI[[SRCELEMENT].[PAD1,...]]\fR ! CAPS ! \fI[[SINKELEMENT].[PAD1,...]]\fR
138 Links the element with name SRCELEMENT to the element with name SINKELEMENT,
139 using the caps specified in CAPS as a filter.
140 Names can be set on elements with the name property. If the name is omitted, the
141 element that was specified directly in front of or after the link is used. This
142 works across bins. If a padname is given, the link is done with these pads. If
143 no pad names are given all possibilities are tried and a matching pad is used.
144 If multiple padnames are given, both sides must have the same number of pads
145 specified and multiple links are done in the given order.
147 So the simplest link is a simple exclamation mark, that links the element to
148 the left of it to the element right of it.
150 Note that when specifying either pads or element names you have to include the
151 dot or your syntax will be misinterpreted. This is a change to the old syntax
152 used up to version 0.6 that allowed omitting the dot when only specifying a
157 MIMETYPE \fI[, PROPERTY[, PROPERTY ...]]]\fR \fI[; CAPS[; CAPS ...]]\fR
159 Creates a capability with the given mimetype and optionally with given
160 properties. The mimetype can be escaped using " or '.
161 If you want to chain caps, you can add more caps in the same format afterwards.
165 NAME\fI[:TYPE]\fR=VALUE
167 in lists and ranges: [TYPE=]VALUE
169 Sets the requested property in capabilites. The name is an alphanumeric value
170 and the type can have the following case-insensitive values:
172 - \fBi\fR or \fBint\fR for integer values or ranges
174 - \fBf\fR or \fBfloat\fR for float values or ranges
176 - \fB4\fR or \fBfourcc\fR for FOURCC values
178 - \fBb\fR, \fBbool\fR or \fBboolean\fR for boolean values
180 - \fBs\fR, \fBstr\fR or \fBstring\fR for strings
182 - \fBl\fR or \fBlist\fR for lists
184 If no type was given, the following order is tried: integer, float, boolean,
187 Integer values must be parsable by \fBstrtol()\fP, floats by \fBstrtod()\fP. FOURCC values may
188 either be integers or strings. Boolean values are (case insensitive) \fIyes\fR,
189 \fIno\fR, \fItrue\fR or \fIfalse\fR and may like strings be escaped with " or '.
191 Ranges are in this format: [ PROPERTY, PROPERTY ]
193 Lists use this format: ( PROPERTY \fI[, PROPERTY ...]\fR )
195 .SH "PIPELINE CONTROL"
197 A pipeline can be controlled by signals. SIGUSR2 will stop the pipeline
198 (GST_STATE_NULL); SIGUSR1 will put it back to play (GST_STATE_PLAYING).
199 By default, the pipeline will start in the playing state.
201 There are currently no signals defined to go into the ready or pause
202 (GST_STATE_READY and GST_STATE_PAUSED) state explicitely.
204 .SH "PIPELINE EXAMPLES"
206 The examples below assume that you have the correct plug-ins available.
207 In general, "osssink" can be substituted with another audio output
208 plug-in such as "esdsink", "alsasink", or "artsdsink". Likewise,
209 "xvideosink" can be substituted with "sdlvideosink" or "aasink".
214 gst\-launch filesrc location=music.mp3 ! mad ! osssink
216 Play the mp3 music file "music.mp3" using a libmad-based plug-in and
217 output to an OSS device
220 gst\-launch filesrc location=music.ogg ! vorbisfile ! osssink
222 Play an Ogg Vorbis format file
225 gst\-launch gnomevfssrc location=music.mp3 ! mad ! osssink
228 gst\-launch gnomevfssrc location=http://domain.com/music.mp3 ! mad ! osssink
230 Play an mp3 file or an http stream using GNOME\-VFS
233 gst\-launch gnomevfssrc location=smb://computer/music.mp3 ! mad ! osssink
235 Use GNOME\-VFS to play an mp3 file located on an SMB server
240 gst\-launch filesrc location=music.mp3 ! mad ! vorbisenc ! filesink location=music.ogg
242 Convert an mp3 music file to an Ogg Vorbis file
245 gst\-launch filesrc location=music.mp3 ! mad ! flacenc ! filesink location=test.flac
247 Convert to the FLAC format
252 gst\-launch filesrc location=music.wav ! wavparse ! osssink
257 gst\-launch filesrc location=music.wav ! wavparse ! vorbisenc ! filesink location=music.ogg
260 gst\-launch filesrc location=music.wav ! wavparse ! mpegaudio ! filesink location=music.mp3
262 Convert a .WAV file into Ogg Vorbis (or mp3) file
264 Alternatively, if you have lame installed (and have the lame plug-in),
265 you can substitute lame for mpegaudio in the previous example. It gives
266 better results than mpegaudio.
269 gst\-launch cdparanoia ! mpegaudio ! filesink location=cd.mp3
271 Rip all tracks from compact disc and convert them into a single mp3 file
273 Using \fBgst\-inspect\fR(1), it is possible to discover settings for cdparanoia
274 that will tell it to rip individual tracks.
277 gst\-launch osssrc ! vorbisenc ! filesink location=input.ogg
279 Record sound from your audio input and encode it into an ogg file
284 gst\-launch filesrc location=JB_FF9_TheGravityOfLove.mpg ! mpegdemux ! mpeg2dec ! xvideosink
286 Display only the video portion of an MPEG-1 video file, outputting to
290 gst\-launch filesrc location=/flflfj.vob ! mpegdemux ! mpeg2dec ! sdlvideosink
292 Display the video portion of a .vob file (used on DVDs), outputting to
296 gst\-launch filesrc location=movie.mpg ! mpegdemux name=demuxer ! mpeg2dec ! sdlvideosink demuxer. ! mad ! osssink
298 Play both video and audio portions of an MPEG movie
301 gst\-launch filesrc location=movie.mpg ! mpegdemux name=demuxer ! { queue ! mpeg2dec ! sdlvideosink } { demuxer. ! queue ! mad ! osssink }
303 Use threaded output to improve synchronization and smoothness. Threads require
304 queues for buffering on thread boundaries
307 gst\-launch filesrc location=movie.avi ! avidemux name=demuxer ! { queue ! ffdecall ! sdlvideosink } { demuxer. ! queue ! mad ! osssink }
313 An MPEG\-1 system stream can be streamed via RTP from one machine to
317 gst\-launch rtprecv media_type=mpeg1_sys ! mpegdemux name=demuxer ! { queue ! mpeg2dec ! xvideosink } { demuxer. ! queue ! mad ! osssink }
319 Use this command on the receiver
322 gst\-launch filesrc location=mpeg1system.mpeg ! mpegparse ! rtpsend ip=IPorHostname
324 This command would be run on the transmitter
329 gst\-launch fakesrc ! fakesink
331 Generate a null stream and ignore it
334 gst\-launch sinesrc ! osssink
336 Generate a pure tone to test the audio output
339 gst\-launch videotestsrc ! xvideosink
341 Generate a familiar test pattern to test the video output
345 You can use the spider element to automatically select the right elements to get
349 gst\-launch filesrc location=musicfile ! spider ! osssink
351 Play any supported audio format
354 gst\-launch filesrc location=videofile ! spider name=spider ! osssink spider. ! xvideosink
357 gst\-launch filesrc location=videofile ! spider name=spider ! { queue ! osssink } { spider. ! queue ! xvideosink }
359 Play any supported video format with video and audio output. The second pipeline
360 uses threaded output.
362 .B Filtered connections
364 These examples show you how to use filtered caps.
367 gst\-launch videotestsrc ! video/raw, format:fourcc=YUY2; video/raw, format:fourcc=YV12 ! xvideosink
369 Show a test image and use the YUY2 or YV12 video format for this.
372 gst\-launch osssrc ! "audio/raw", format=int, width=[16, 32], depth=(16, 24, 32), signed=TRUE ! osssink
374 Playback currently recorded audio. Force usage of signed 16 to 32 bit samples.
381 .BR gst\-complete (1),
382 .BR gst\-register (1),
385 The GStreamer team at http://gstreamer.net/