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 A colon seperated list of category_name=level pairs to specify debugging levels
59 for each category. Level is in the range 0-5 where 0 will show no messages, and
60 5 will show all messages. The wildcard * can be used to match category names.
62 Use \-\-gst\-debug\-help to show category names
65 GST_CAT=5:GST_ELEMENT_*=3
67 .B \-\-gst\-debug\-level=LEVEL
68 Sets the threshold for printing debugging messages. A higher level
69 will print more messages. The useful range is 0-5, with the default
72 .B \-\-gst\-debug\-no\-color
73 \fIGStreamer\fP normally prints debugging messages so that the
74 messages are color-coded when printed to a terminal that handles
75 ANSI escape sequences. Using this option causes \fIGStreamer\fP
76 to print messages without color.
78 .B \-\-gst\-disable\-debug
81 .B \-\-gst\-debug\-help
82 Prints a list of available debug categories and their default debugging level.
84 .B \-\-gst\-disable\-cpu\-opt
85 \fIGStreamer\fP normally automatically detects the capabilities of the
86 current CPU and selects the optimal implementation for some functions.
87 Using this flag disables detection, which is useful for debugging.
89 .B \-\-gst\-plugin\-spew
90 \fIGStreamer\fP info flags to set
91 Enable printout of errors while loading \fIGStreamer\fP plugins
93 .B \-\-gst\-plugin\-path=PATH
94 Add directories separated with ':' to the plugin search path
96 .B \-\-gst\-plugin\-load=PLUGINS
97 Preload plugins specified in a comma-separated list. Another way to specify
98 plugins to preload is to use the environment variable GST_PLUGIN_PATH
100 .B \-\-gst\-scheduler=SCHEDULER
101 Use SCHEDULER as the default scheduler
103 .B \-\-gst\-registry=REGISTRY
104 Use the file REGISTRY as registry instead of the default
106 .SH "PIPELINE DESCRIPTION"
108 A pipeline consists \fIelements\fR and \fIlinks\fR. \fIElements\fR can be put
109 into \fIbins\fR of different sorts. \fIElements\fR, \fIlinks\fR and \fIbins\fR
110 can be specified in a pipeline description in any order.
114 ELEMENTTYPE \fI[PROPERTY1 ...]\fR
116 Creates an element of type ELEMENTTYPE and sets the PROPERTIES.
122 Sets the property to the specified value. You can use \fBgst\-inspect\fR(1) to
123 find out about properties and allowed values of different elements.
125 Enumeration properties can be set by name, nick or value.
129 \fI[BINTYPE.]\fR ( \fI[PROPERTY1 ...]\fR PIPELINE-DESCRIPTION )
131 { \fI[PROPERTY1 ...]\fR PIPELINE-DESCRIPTION }
133 Specifies that a bin of type BINTYPE is created and the given properties are
134 set. Every element between the braces is put into the bin. Using curly braces
135 (second line) is a short cut for using the first line and "thread" as the
138 Please not the dot that has to be used after the BINTYPE.
142 \fI[[SRCELEMENT].[PAD1,...]]\fR ! \fI[[SINKELEMENT].[PAD1,...]]\fR
143 \fI[[SRCELEMENT].[PAD1,...]]\fR ! CAPS ! \fI[[SINKELEMENT].[PAD1,...]]\fR
145 Links the element with name SRCELEMENT to the element with name SINKELEMENT,
146 using the caps specified in CAPS as a filter.
147 Names can be set on elements with the name property. If the name is omitted, the
148 element that was specified directly in front of or after the link is used. This
149 works across bins. If a padname is given, the link is done with these pads. If
150 no pad names are given all possibilities are tried and a matching pad is used.
151 If multiple padnames are given, both sides must have the same number of pads
152 specified and multiple links are done in the given order.
154 So the simplest link is a simple exclamation mark, that links the element to
155 the left of it to the element right of it.
157 Note that when specifying either pads or element names you have to include the
158 dot or your syntax will be misinterpreted. This is a change to the old syntax
159 used up to version 0.6 that allowed omitting the dot when only specifying a
164 MIMETYPE \fI[, PROPERTY[, PROPERTY ...]]]\fR \fI[; CAPS[; CAPS ...]]\fR
166 Creates a capability with the given mimetype and optionally with given
167 properties. The mimetype can be escaped using " or '.
168 If you want to chain caps, you can add more caps in the same format afterwards.
172 NAME\fI[:TYPE]\fR=VALUE
174 in lists and ranges: [TYPE=]VALUE
176 Sets the requested property in capabilites. The name is an alphanumeric value
177 and the type can have the following case-insensitive values:
179 - \fBi\fR or \fBint\fR for integer values or ranges
181 - \fBf\fR or \fBfloat\fR for float values or ranges
183 - \fB4\fR or \fBfourcc\fR for FOURCC values
185 - \fBb\fR, \fBbool\fR or \fBboolean\fR for boolean values
187 - \fBs\fR, \fBstr\fR or \fBstring\fR for strings
189 - \fBl\fR or \fBlist\fR for lists
191 If no type was given, the following order is tried: integer, float, boolean,
194 Integer values must be parsable by \fBstrtol()\fP, floats by \fBstrtod()\fP. FOURCC values may
195 either be integers or strings. Boolean values are (case insensitive) \fIyes\fR,
196 \fIno\fR, \fItrue\fR or \fIfalse\fR and may like strings be escaped with " or '.
198 Ranges are in this format: [ PROPERTY, PROPERTY ]
200 Lists use this format: ( PROPERTY \fI[, PROPERTY ...]\fR )
202 .SH "PIPELINE CONTROL"
204 A pipeline can be controlled by signals. SIGUSR2 will stop the pipeline
205 (GST_STATE_NULL); SIGUSR1 will put it back to play (GST_STATE_PLAYING).
206 By default, the pipeline will start in the playing state.
208 There are currently no signals defined to go into the ready or pause
209 (GST_STATE_READY and GST_STATE_PAUSED) state explicitely.
211 .SH "PIPELINE EXAMPLES"
213 The examples below assume that you have the correct plug-ins available.
214 In general, "osssink" can be substituted with another audio output
215 plug-in such as "esdsink", "alsasink", or "artsdsink". Likewise,
216 "xvideosink" can be substituted with "sdlvideosink" or "aasink".
221 gst\-launch filesrc location=music.mp3 ! mad ! osssink
223 Play the mp3 music file "music.mp3" using a libmad-based plug-in and
224 output to an OSS device
227 gst\-launch filesrc location=music.ogg ! vorbisfile ! osssink
229 Play an Ogg Vorbis format file
232 gst\-launch gnomevfssrc location=music.mp3 ! mad ! osssink
235 gst\-launch gnomevfssrc location=http://domain.com/music.mp3 ! mad ! osssink
237 Play an mp3 file or an http stream using GNOME\-VFS
240 gst\-launch gnomevfssrc location=smb://computer/music.mp3 ! mad ! osssink
242 Use GNOME\-VFS to play an mp3 file located on an SMB server
247 gst\-launch filesrc location=music.mp3 ! mad ! vorbisenc ! filesink location=music.ogg
249 Convert an mp3 music file to an Ogg Vorbis file
252 gst\-launch filesrc location=music.mp3 ! mad ! flacenc ! filesink location=test.flac
254 Convert to the FLAC format
259 gst\-launch filesrc location=music.wav ! wavparse ! osssink
264 gst\-launch filesrc location=music.wav ! wavparse ! vorbisenc ! filesink location=music.ogg
267 gst\-launch filesrc location=music.wav ! wavparse ! mpegaudio ! filesink location=music.mp3
269 Convert a .WAV file into Ogg Vorbis (or mp3) file
271 Alternatively, if you have lame installed (and have the lame plug-in),
272 you can substitute lame for mpegaudio in the previous example. It gives
273 better results than mpegaudio.
276 gst\-launch cdparanoia ! mpegaudio ! filesink location=cd.mp3
278 Rip all tracks from compact disc and convert them into a single mp3 file
280 Using \fBgst\-inspect\fR(1), it is possible to discover settings for cdparanoia
281 that will tell it to rip individual tracks.
284 gst\-launch osssrc ! vorbisenc ! filesink location=input.ogg
286 Record sound from your audio input and encode it into an ogg file
291 gst\-launch filesrc location=JB_FF9_TheGravityOfLove.mpg ! mpegdemux ! mpeg2dec ! xvideosink
293 Display only the video portion of an MPEG-1 video file, outputting to
297 gst\-launch filesrc location=/flflfj.vob ! mpegdemux ! mpeg2dec ! sdlvideosink
299 Display the video portion of a .vob file (used on DVDs), outputting to
303 gst\-launch filesrc location=movie.mpg ! mpegdemux name=demuxer ! mpeg2dec ! sdlvideosink demuxer. ! mad ! osssink
305 Play both video and audio portions of an MPEG movie
308 gst\-launch filesrc location=movie.mpg ! mpegdemux name=demuxer ! { queue ! mpeg2dec ! sdlvideosink } { demuxer. ! queue ! mad ! osssink }
310 Use threaded output to improve synchronization and smoothness. Threads require
311 queues for buffering on thread boundaries
314 gst\-launch filesrc location=movie.avi ! avidemux name=demuxer ! { queue ! ffdecall ! sdlvideosink } { demuxer. ! queue ! mad ! osssink }
320 An MPEG\-1 system stream can be streamed via RTP from one machine to
324 gst\-launch rtprecv media_type=mpeg1_sys ! mpegdemux name=demuxer ! { queue ! mpeg2dec ! xvideosink } { demuxer. ! queue ! mad ! osssink }
326 Use this command on the receiver
329 gst\-launch filesrc location=mpeg1system.mpeg ! mpegparse ! rtpsend ip=IPorHostname
331 This command would be run on the transmitter
336 gst\-launch fakesrc ! fakesink
338 Generate a null stream and ignore it
341 gst\-launch sinesrc ! osssink
343 Generate a pure tone to test the audio output
346 gst\-launch videotestsrc ! xvideosink
348 Generate a familiar test pattern to test the video output
352 You can use the spider element to automatically select the right elements to get
356 gst\-launch filesrc location=musicfile ! spider ! osssink
358 Play any supported audio format
361 gst\-launch filesrc location=videofile ! spider name=spider ! osssink spider. ! xvideosink
364 gst\-launch filesrc location=videofile ! spider name=spider ! { queue ! osssink } { spider. ! queue ! xvideosink }
366 Play any supported video format with video and audio output. The second pipeline
367 uses threaded output.
369 .B Filtered connections
371 These examples show you how to use filtered caps.
374 gst\-launch videotestsrc ! video/raw, format:fourcc=YUY2; video/raw, format:fourcc=YV12 ! xvideosink
376 Show a test image and use the YUY2 or YV12 video format for this.
379 gst\-launch osssrc ! "audio/raw", format=int, width=[16, 32], depth=(16, 24, 32), signed=TRUE ! osssink
381 Playback currently recorded audio. Force usage of signed 16 to 32 bit samples.
388 .BR gst\-complete (1),
389 .BR gst\-register (1),
392 The GStreamer team at http://gstreamer.net/