tools/gst-launch-1.0.1 - imx-gstreamer - Git at Google

 .TH "GStreamer" "1" "May 2007"
 .SH "NAME"
 gst\-launch\-1.0 \- build and run a GStreamer pipeline
 .SH "SYNOPSIS"
 \fBgst\-launch\-1.0\fR \fI[OPTION...]\fR PIPELINE\-DESCRIPTION
 .SH "DESCRIPTION"
 .LP
 \fIgst\-launch\-1.0\fP is a tool that builds and runs basic
 \fIGStreamer\fP pipelines.

 In simple form, a PIPELINE\-DESCRIPTION is a list of
 elements separated by exclamation marks (!). Properties may be appended to
 elements, in the form \fIproperty=value\fR.

 For a complete description of possible PIPELINE-DESCRIPTIONS see the section
 \fIpipeline description\fR below or consult the GStreamer documentation.

 Please note that \fIgst\-launch\-1.0\fP 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 descriptions.
 .
 .SH "OPTIONS"
 .l
 \fIgst\-launch\-1.0\fP accepts the following options:
 .TP 8
 .B  \-\-help
 Print help synopsis and available FLAGS
 .TP 8
 .B  \-v, \-\-verbose
 Output status information and property notifications
 .TP 8
 .B  \-q, \-\-quiet
 Do not print any progress information
 .TP 8
 .B  \-m, \-\-messages
 Output messages posted on the pipeline's bus
 .TP 8
 .B  \-t, \-\-tags
 Output tags (also known as metadata)
 .TP 8
 .B  \-e, \-\-eos\-on\-shutdown
 Force an EOS event on sources before shutting the pipeline down. This is
 useful to make sure muxers create readable files when a muxing pipeline is
 shut down forcefully via Control-C.
 .TP 8
 .B  \-i, \-\-index
 Gather and print index statistics. This is mostly useful for playback or
 recording pipelines.
 .TP 8
 .B  \-f, \-\-no\-fault
 Do not install a fault handler
 .TP 8
 .B  \-T, \-\-trace
 Print memory allocation traces. The feature must be enabled at compile time to
 work.
 .TP 8

 .
 .SH "GSTREAMER OPTIONS"
 .l
 \fIgst\-launch\-1.0\fP also accepts the following options that are common
 to all GStreamer applications:
 .TP 8
 .B  \-\-gst\-version
 Prints the version string of the \fIGStreamer\fP core library.
 .TP 8
 .B  \-\-gst\-fatal\-warnings
 Causes \fIGStreamer\fP to abort if a warning message occurs. This is equivalent
 to setting the environment variable G_DEBUG to 'fatal_warnings' (see the
 section \fIenvironment variables\fR below for further information).
 .TP 8
 .B  \-\-gst\-debug=STRING
 A comma separated list of category_name:level pairs to specify debugging levels
 for each category. Level is in the range 0-9 where 0 will show no messages, and
 9 will show all messages. The wildcard * can be used to match category names.
 Note that the order of categories and levels is important, wildcards at the
 end may override levels set earlier. The log levels are: 1=ERROR, 2=WARNING,
 3=FIXME, 4=INFO, 5=DEBUG, 6=LOG, 7=TRACE, 9=MEMDUMP. Since GStreamer 1.2 one
 can also use the debug level names, e.g. \-\-gst\-debug=*sink:LOG. A full
 description of the various debug levels can be found in the GStreamer core
 library API documentation, in the "Running GStreamer Applications" section.

 Use \-\-gst\-debug\-help to show category names

 Example:
 GST_CAT:5,GST_ELEMENT_*:3,oggdemux:5

 .TP 8
 .B  \-\-gst\-debug\-level=LEVEL
 Sets the threshold for printing debugging messages.  A higher level
 will print more messages.  The useful range is 0-9, with the default
 being 0. Level 6 (LOG level) will show all information that is usually
 required for debugging purposes. Higher levels are only useful in very
 specific cases. See above for the full list of levels.
 .TP 8
 .B  \-\-gst\-debug\-no\-color
 \fIGStreamer\fP normally prints debugging messages so that the
 messages are color-coded when printed to a terminal that handles
 ANSI escape sequences.  Using this option causes \fIGStreamer\fP
 to print messages without color. Setting the \fBGST_DEBUG_NO_COLOR\fR
 environment variable will achieve the same thing.
 .TP 8
 .B  \-\-gst\-debug\-color\-mode
 \fIGStreamer\fP normally prints debugging messages so that the
 messages are color-coded when printed to a terminal that handles
 ANSI escape sequences (on *nix), or uses W32 console API to color the
 messages printed into a console (on W32). Using this option causes
 \fIGStreamer\fP to print messages without color ('off' or 'disable'),
 print messages with default colors ('on' or 'auto'), or print messages
 using ANSI escape sequences for coloring ('unix'). Setting the
 \fBGST_DEBUG_COLOR_MODE\fR environment variable will achieve the same thing.
 .TP 8
 .B  \-\-gst\-debug\-disable
 Disables debugging.
 .TP 8
 .B  \-\-gst\-debug\-help
 Prints a list of available debug categories and their default debugging level.
 .TP 8
 .B  \-\-gst\-plugin\-spew
 \fIGStreamer\fP info flags to set
 Enable printout of errors while loading \fIGStreamer\fP plugins
 .TP 8
 .B  \-\-gst\-plugin\-path=PATH
 Add directories separated with ':' to the plugin search path
 .TP 8
 .B  \-\-gst\-plugin\-load=PLUGINS
 Preload plugins specified in a comma-separated list. Another way to specify
 plugins to preload is to use the environment variable GST_PLUGIN_PATH

 .SH "PIPELINE DESCRIPTION"

 A pipeline consists \fIelements\fR and \fIlinks\fR. \fIElements\fR can be put
 into \fIbins\fR of different sorts. \fIElements\fR, \fIlinks\fR and \fIbins\fR
 can be specified in a pipeline description in any order.

 .B Elements

 ELEMENTTYPE \fI[PROPERTY1 ...]\fR

 Creates an element of type ELEMENTTYPE and sets the PROPERTIES.

 .B Properties

 PROPERTY=VALUE ...

 Sets the property to the specified value. You can use \fBgst\-inspect\-1.0\fR(1) to
 find out about properties and allowed values of different elements.
 .br
 Enumeration properties can be set by name, nick or value.

 .B Bins

 \fI[BINTYPE.]\fR ( \fI[PROPERTY1 ...]\fR PIPELINE-DESCRIPTION )
 .br

 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.

 .B Links

 \fI[[SRCELEMENT].[PAD1,...]]\fR ! \fI[[SINKELEMENT].[PAD1,...]]\fR
 \fI[[SRCELEMENT].[PAD1,...]]\fR ! CAPS ! \fI[[SINKELEMENT].[PAD1,...]]\fR
 \fI[[SRCELEMENT].[PAD1,...]]\fR : \fI[[SINKELEMENT].[PAD1,...]]\fR
 \fI[[SRCELEMENT].[PAD1,...]]\fR : CAPS : \fI[[SINKELEMENT].[PAD1,...]]\fR

 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.
 .br
 So the simplest link is a simple exclamation mark, that links the element to
 the left of it to the element right of it.
 .br
 Linking using the : operator attempts to link all possible pads between
 the elements
 .br

 .B Caps

 MEDIATYPE \fI[, PROPERTY[, PROPERTY ...]]]\fR \fI[; CAPS[; CAPS ...]]\fR

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

 .B Properties

 NAME=\fI[(TYPE)]\fRVALUE
 .br
 in lists and ranges: \fI[(TYPE)]\fRVALUE

 Sets the requested property in capabilities. The name is an alphanumeric value
 and the type can have the following case-insensitive values:
 .br
 - \fBi\fR or \fBint\fR for integer values or ranges
 .br
 - \fBf\fR or \fBfloat\fR for float values or ranges
 .br
 - \fBb\fR, \fBbool\fR or \fBboolean\fR for boolean values
 .br
 - \fBs\fR, \fBstr\fR or \fBstring\fR for strings
 .br
 - \fBfraction\fR for fractions (framerate, pixel\-aspect\-ratio)
 .br
 - \fBl\fR or \fBlist\fR for lists
 .br
 If no type was given, the following order is tried: integer, float, boolean,
 string.
 .br
 Integer values must be parsable by \fBstrtol()\fP, floats by \fBstrtod()\fP. FOURCC values may
 either be integers or strings. Boolean values are (case insensitive) \fIyes\fR,
 \fIno\fR, \fItrue\fR or \fIfalse\fR and may like strings be escaped with " or '.
 .br
 Ranges are in this format:  [ VALUE, VALUE ]
 .br
 Lists use this format:      { VALUE \fI[, VALUE ...]\fR }

 .SH "PIPELINE EXAMPLES"

 The examples below assume that you have the correct plug-ins available.
 In general, "pulsesink" can be substituted with another audio output
 plug-in such as "alsasink" or "osxaudiosink"
 Likewise, "xvimagesink" can be substituted with "ximagesink", "glimagesink",
 or "osxvideosink". Keep in mind though that different sinks might
 accept different formats and even the same sink might accept different formats
 on different machines, so you might need to add converter elements like
 audioconvert and audioresample (for audio) or videoconvert (for video)
 in front of the sink to make things work.

 .B Audio playback

 Play the mp3 music file "music.mp3" using a libmpg123-based plug-in and
 output to an Pulseaudio device
 .br
 .B
         gst\-launch\-1.0 filesrc location=music.mp3 ! mpegaudioparse ! mpg123audiodec ! audioconvert ! audioresample ! pulsesink

 Play an Ogg Vorbis format file
 .br
 .B
         gst\-launch\-1.0 filesrc location=music.ogg ! oggdemux ! vorbisdec ! audioconvert ! audioresample ! pulsesink

 Play an mp3 file or an http stream using GIO
 .br
 .B
         gst\-launch\-1.0 giosrc location=music.mp3 ! mpegaudioparse ! mpg123audiodec ! audioconvert ! pulsesink
 .br
 .B
         gst\-launch\-1.0 giosrc location=http://domain.com/music.mp3 ! mpegaudioparse ! mpg123audiodec ! audioconvert ! audioresample ! pulsesink

 Use GIO to play an mp3 file located on an SMB server
 .br
 .B
         gst\-launch\-1.0 giosrc location=smb://computer/music.mp3 ! mpegaudioparse ! mpg123audiodec ! audioconvert ! audioresample ! pulsesink

 .B Format conversion

 Convert an mp3 music file to an Ogg Vorbis file
 .br
 .B
         gst\-launch\-1.0 filesrc location=music.mp3 ! mpegaudioparse ! mpg123audiodec ! audioconvert ! vorbisenc ! oggmux ! filesink location=music.ogg

 Convert to the FLAC format
 .br
 .B
         gst\-launch\-1.0 filesrc location=music.mp3 ! mpegaudioparse ! mpg123audiodec ! audioconvert ! flacenc ! filesink location=test.flac

 .B Other

 Plays a .WAV file that contains raw audio data (PCM).
 .br
 .B
         gst\-launch\-1.0 filesrc location=music.wav ! wavparse ! audioconvert ! audioresample ! pulsesink

 Convert a .WAV file containing raw audio data into an Ogg Vorbis or mp3 file
 .br
 .B
         gst\-launch\-1.0 filesrc location=music.wav ! wavparse ! audioconvert ! vorbisenc ! oggmux ! filesink location=music.ogg
 .br
 .B
         gst\-launch\-1.0 filesrc location=music.wav ! wavparse ! audioconvert ! lamemp3enc ! filesink location=music.mp3

 Rips all tracks from compact disc and convert them into a single mp3 file
 .br
 .B
         gst\-launch\-1.0 cdparanoiasrc mode=continuous ! audioconvert ! lamemp3enc ! mpegaudioparse ! id3v2mux ! filesink location=cd.mp3

 Rips track 5 from the CD and converts it into a single mp3 file
 .br
 .B
         gst\-launch\-1.0 cdparanoiasrc track=5 ! audioconvert ! lamemp3enc ! mpegaudioparse ! id3v2mux ! filesink location=track5.mp3

 Using \fBgst\-inspect\-1.0\fR(1), it is possible to discover settings like the above
 for cdparanoiasrc that will tell it to rip the entire cd or only tracks of it.
 Alternatively, you can use an URI and gst\-launch\-1.0 will find an element (such as
 cdparanoia) that supports that protocol for you, e.g.:
 .B
        gst\-launch\-1.0 cdda://5 ! lamemp3enc vbr=new vbr\-quality=6 ! filesink location=track5.mp3

 Records sound from your audio input and encodes it into an ogg file
 .br
 .B
         gst\-launch\-1.0 pulsesrc ! audioconvert ! vorbisenc ! oggmux ! filesink location=input.ogg

 .B Video

 Display only the video portion of an MPEG-1 video file, outputting to
 an X display window
 .br
 .B
         gst\-launch\-1.0 filesrc location=JB_FF9_TheGravityOfLove.mpg ! dvddemux ! mpegvideoparse ! mpeg2dec ! xvimagesink

 Display the video portion of a .vob file (used on DVDs), outputting to
 an SDL window
 .br
 .B
         gst\-launch\-1.0 filesrc location=/flflfj.vob ! dvddemux ! mpegvideoparse ! mpeg2dec ! sdlvideosink

 Play both video and audio portions of an MPEG movie
 .br
 .B
         gst\-launch\-1.0 filesrc location=movie.mpg ! dvddemux name=demuxer  demuxer. ! queue ! mpegvideoparse ! mpeg2dec ! sdlvideosink  demuxer. ! queue ! mpegaudioparse ! mpg123audiodec ! audioconvert ! audioresample ! pulsesink

 Play an AVI movie with an external text subtitle stream
 .br
 .B
         gst\-launch\-1.0 filesrc location=movie.mpg ! mpegdemux name=demuxer demuxer. ! queue ! mpegvideoparse ! mpeg2dec ! videoconvert ! sdlvideosink   demuxer. ! queue ! mpegaudioparse ! mpg123audiodec ! audioconvert ! audioresample ! pulsesink

 This example also shows how to refer to specific pads by name if an element
 (here: textoverlay) has multiple sink or source pads.
 .br
 .B
         gst\-launch\-1.0 textoverlay name=overlay ! videoconvert ! videoscale !  autovideosink   filesrc location=movie.avi ! decodebin ! videoconvert ! overlay.video_sink   filesrc location=movie.srt ! subparse ! overlay.text_sink

 Play an AVI movie with an external text subtitle stream using playbin
 .br
 .B
         gst\-launch\-1.0 playbin uri=file:///path/to/movie.avi suburi=file:///path/to/movie.srt

 .B Network streaming

 Stream video using RTP and network elements.

 This command would be run on the transmitter
 .br
 .B
         gst\-launch\-1.0 v4l2src ! video/x\-raw,width=128,height=96,format=UYVY ! videoconvert ! ffenc_h263 ! video/x\-h263 ! rtph263ppay pt=96 ! udpsink host=192.168.1.1 port=5000

 Use this command on the receiver
 .br
 .B
         gst\-launch\-1.0 udpsrc port=5000 ! application/x\-rtp, clock\-rate=90000,payload=96 ! rtph263pdepay queue\-delay=0 ! ffdec_h263 ! xvimagesink

 .B Diagnostic

 Generate a null stream and ignore it (and print out details).
 .br
 .B
         gst\-launch\-1.0 \-v fakesrc num\-buffers=16 ! fakesink

 Generate a pure sine tone to test the audio output
 .br
 .B
         gst\-launch\-1.0 audiotestsrc ! audioconvert ! audioresample ! pulsesink

 Generate a familiar test pattern to test the video output
 .br
 .B
         gst\-launch\-1.0 videotestsrc ! xvimagesink
 .br
 .B
         gst\-launch\-1.0 videotestsrc ! ximagesink

 .B Automatic linking

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

 Play any supported audio format
 .br
 .B
         gst\-launch\-1.0 filesrc location=musicfile ! decodebin ! audioconvert ! audioresample ! pulsesink

 Play any supported video format with video and audio output. Threads are used
 automatically. To make this even easier, you can use the playbin element:
 .br
 .B
         gst\-launch\-1.0 filesrc location=videofile ! decodebin name=decoder decoder. ! queue ! audioconvert ! audioresample ! pulsesink   decoder. !  videoconvert ! xvimagesink
 .br
 .B
         gst\-launch\-1.0 playbin uri=file:///home/joe/foo.avi


 .B Filtered connections

 These examples show you how to use filtered caps.

 Show a test image and use the YUY2 or YV12 video format for this.
 .br
 .B
         gst\-launch\-1.0 videotestsrc ! 'video/x\-raw,format=YUY2;video/x\-raw,format=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.
 .br
 .B
         gst\-launch\-1.0 pulsesrc !  'audio/x\-raw,rate=[32000,64000],format={S16LE,S24LE,S32LE}' ! wavenc ! filesink location=recording.wav


 .SH "ENVIRONMENT VARIABLES"
 .TP
 \fBGST_DEBUG\fR
 Comma-separated list of debug categories and levels (e.g.
 GST_DEBUG=totem:4,typefind:5). '*' is allowed as a wildcard as part of
 debug category names (e.g. GST_DEBUG=*sink:6,*audio*:6). Since 1.2.0 it is
 also possible to specify the log level by name (1=ERROR, 2=WARN, 3=FIXME,
 4=INFO, 5=DEBUG, 6=LOG, 7=TRACE, 9=MEMDUMP) (e.g. GST_DEBUG=*audio*:LOG)
 .TP
 \fBGST_DEBUG_NO_COLOR\fR
 When this environment variable is set, coloured debug output is disabled.
 .TP
 \fBGST_DEBUG_DUMP_DOT_DIR\fR
 When set to a filesystem path, store 'dot' files of pipeline graphs there.
 These can then later be converted into an image using the 'dot' utility from
 the graphviz set of tools, like this: dot foo.dot \-Tsvg \-o foo.svg (png or jpg
 are also possible as output format). There is also a utility called 'xdot'
 which allows you to view the .dot file directly without converting it first.
 .br
 When the pipeline changes state through NULL to PLAYING and back to NULL, a
 dot file is generated on each state change. To write a snapshot of the
 pipeline state, send a SIGHUP to the process.
 .TP
 \fBGST_REGISTRY\fR
 Path of the plugin registry file. Default is
 ~/.cache/gstreamer\-1.0/registry\-CPU.bin where CPU is the
 machine/cpu type GStreamer was compiled for, e.g. 'i486', 'i686', 'x86\-64', 'ppc',
 etc. (check the output of "uname \-i" and "uname \-m" for details).
 .TP
 \fBGST_REGISTRY_UPDATE\fR
 Set to "no" to force GStreamer to assume that no plugins have changed,
 been added or been removed. This will make GStreamer skip the initial check
 whether a rebuild of the registry cache is required or not. This may be useful
 in embedded environments where the installed plugins never change. Do not
 use this option in any other setup.
 .TP
 \fBGST_PLUGIN_PATH\fR
 Specifies a list of directories to scan for additional plugins.
 These take precedence over the system plugins.
 .TP
 \fBGST_PLUGIN_SYSTEM_PATH\fR
 Specifies a list of plugins that are always loaded by default.  If not set,
 this defaults to the system-installed path, and the plugins installed in the
 user's home directory
 .TP
 \fBGST_DEBUG_FILE\fR
 Set this variable to a file path to redirect all GStreamer debug
 messages to this file. If left unset, debug messages with be output
 unto the standard error.
 .TP
 \fBORC_CODE\fR
 Useful Orc environment variable. Set ORC_CODE=debug to enable debuggers
 such as gdb to create useful backtraces from Orc-generated code.  Set
 ORC_CODE=backup or ORC_CODE=emulate if you suspect Orc's SIMD code
 generator is producing incorrect code.  (Quite a few important
 GStreamer plugins like videotestsrc, audioconvert or audioresample use Orc).
 .TP
 \fBG_DEBUG\fR
 Useful GLib environment variable. Set G_DEBUG=fatal_warnings to make
 GStreamer programs abort when a critical warning such as an assertion failure
 occurs. This is useful if you want to find out which part of the code caused
 that warning to be triggered and under what circumstances. Simply set G_DEBUG
 as mentioned above and run the program in gdb (or let it core dump). Then get
 a stack trace in the usual way.
 .
 .SH FILES
 .TP 8
 ~/.cache/gstreamer\-1.0/registry\-*.bin
 The plugin cache; can be deleted at any time, will be re-created
 automatically when it does not exist yet or plugins change. Based on
 XDG_CACHE_DIR, so may be in a different location than the one suggested.
 .
 .SH "SEE ALSO"
 .BR gst\-inspect\-1.0 (1),
 .BR gst\-launch\-1.0 (1),
 .SH "AUTHOR"
 The GStreamer team at http://gstreamer.freedesktop.org/
	.TH "GStreamer" "1" "May 2007"
	.SH "NAME"
	gst\-launch\-1.0 \- build and run a GStreamer pipeline
	.SH "SYNOPSIS"
	\fBgst\-launch\-1.0\fR \fI[OPTION...]\fR PIPELINE\-DESCRIPTION
	.SH "DESCRIPTION"
	.LP
	\fIgst\-launch\-1.0\fP is a tool that builds and runs basic
	\fIGStreamer\fP pipelines.

	In simple form, a PIPELINE\-DESCRIPTION is a list of
	elements separated by exclamation marks (!). Properties may be appended to
	elements, in the form \fIproperty=value\fR.

	For a complete description of possible PIPELINE-DESCRIPTIONS see the section
	\fIpipeline description\fR below or consult the GStreamer documentation.

	Please note that \fIgst\-launch\-1.0\fP 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 descriptions.
	.
	.SH "OPTIONS"
	.l
	\fIgst\-launch\-1.0\fP accepts the following options:
	.TP 8
	.B \-\-help
	Print help synopsis and available FLAGS
	.TP 8
	.B \-v, \-\-verbose
	Output status information and property notifications
	.TP 8
	.B \-q, \-\-quiet
	Do not print any progress information
	.TP 8
	.B \-m, \-\-messages
	Output messages posted on the pipeline's bus
	.TP 8
	.B \-t, \-\-tags
	Output tags (also known as metadata)
	.TP 8
	.B \-e, \-\-eos\-on\-shutdown
	Force an EOS event on sources before shutting the pipeline down. This is
	useful to make sure muxers create readable files when a muxing pipeline is
	shut down forcefully via Control-C.
	.TP 8
	.B \-i, \-\-index
	Gather and print index statistics. This is mostly useful for playback or
	recording pipelines.
	.TP 8
	.B \-f, \-\-no\-fault
	Do not install a fault handler
	.TP 8
	.B \-T, \-\-trace
	Print memory allocation traces. The feature must be enabled at compile time to
	work.
	.TP 8

	.
	.SH "GSTREAMER OPTIONS"
	.l
	\fIgst\-launch\-1.0\fP also accepts the following options that are common
	to all GStreamer applications:
	.TP 8
	.B \-\-gst\-version
	Prints the version string of the \fIGStreamer\fP core library.
	.TP 8
	.B \-\-gst\-fatal\-warnings
	Causes \fIGStreamer\fP to abort if a warning message occurs. This is equivalent
	to setting the environment variable G_DEBUG to 'fatal_warnings' (see the
	section \fIenvironment variables\fR below for further information).
	.TP 8
	.B \-\-gst\-debug=STRING
	A comma separated list of category_name:level pairs to specify debugging levels
	for each category. Level is in the range 0-9 where 0 will show no messages, and
	9 will show all messages. The wildcard * can be used to match category names.
	Note that the order of categories and levels is important, wildcards at the
	end may override levels set earlier. The log levels are: 1=ERROR, 2=WARNING,
	3=FIXME, 4=INFO, 5=DEBUG, 6=LOG, 7=TRACE, 9=MEMDUMP. Since GStreamer 1.2 one
	can also use the debug level names, e.g. \-\-gst\-debug=*sink:LOG. A full
	description of the various debug levels can be found in the GStreamer core
	library API documentation, in the "Running GStreamer Applications" section.

	Use \-\-gst\-debug\-help to show category names

	Example:
	GST_CAT:5,GST_ELEMENT_*:3,oggdemux:5

	.TP 8
	.B \-\-gst\-debug\-level=LEVEL
	Sets the threshold for printing debugging messages. A higher level
	will print more messages. The useful range is 0-9, with the default
	being 0. Level 6 (LOG level) will show all information that is usually
	required for debugging purposes. Higher levels are only useful in very
	specific cases. See above for the full list of levels.
	.TP 8
	.B \-\-gst\-debug\-no\-color
	\fIGStreamer\fP normally prints debugging messages so that the
	messages are color-coded when printed to a terminal that handles
	ANSI escape sequences. Using this option causes \fIGStreamer\fP
	to print messages without color. Setting the \fBGST_DEBUG_NO_COLOR\fR
	environment variable will achieve the same thing.
	.TP 8
	.B \-\-gst\-debug\-color\-mode
	\fIGStreamer\fP normally prints debugging messages so that the
	messages are color-coded when printed to a terminal that handles
	ANSI escape sequences (on *nix), or uses W32 console API to color the
	messages printed into a console (on W32). Using this option causes
	\fIGStreamer\fP to print messages without color ('off' or 'disable'),
	print messages with default colors ('on' or 'auto'), or print messages
	using ANSI escape sequences for coloring ('unix'). Setting the
	\fBGST_DEBUG_COLOR_MODE\fR environment variable will achieve the same thing.
	.TP 8
	.B \-\-gst\-debug\-disable
	Disables debugging.
	.TP 8
	.B \-\-gst\-debug\-help
	Prints a list of available debug categories and their default debugging level.
	.TP 8
	.B \-\-gst\-plugin\-spew
	\fIGStreamer\fP info flags to set
	Enable printout of errors while loading \fIGStreamer\fP plugins
	.TP 8
	.B \-\-gst\-plugin\-path=PATH
	Add directories separated with ':' to the plugin search path
	.TP 8
	.B \-\-gst\-plugin\-load=PLUGINS
	Preload plugins specified in a comma-separated list. Another way to specify
	plugins to preload is to use the environment variable GST_PLUGIN_PATH

	.SH "PIPELINE DESCRIPTION"

	A pipeline consists \fIelements\fR and \fIlinks\fR. \fIElements\fR can be put
	into \fIbins\fR of different sorts. \fIElements\fR, \fIlinks\fR and \fIbins\fR
	can be specified in a pipeline description in any order.

	.B Elements

	ELEMENTTYPE \fI[PROPERTY1 ...]\fR

	Creates an element of type ELEMENTTYPE and sets the PROPERTIES.

	.B Properties

	PROPERTY=VALUE ...

	Sets the property to the specified value. You can use \fBgst\-inspect\-1.0\fR(1) to
	find out about properties and allowed values of different elements.
	.br
	Enumeration properties can be set by name, nick or value.

	.B Bins

	\fI[BINTYPE.]\fR ( \fI[PROPERTY1 ...]\fR PIPELINE-DESCRIPTION )
	.br

	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.

	.B Links

	\fI[[SRCELEMENT].[PAD1,...]]\fR ! \fI[[SINKELEMENT].[PAD1,...]]\fR
	\fI[[SRCELEMENT].[PAD1,...]]\fR ! CAPS ! \fI[[SINKELEMENT].[PAD1,...]]\fR
	\fI[[SRCELEMENT].[PAD1,...]]\fR : \fI[[SINKELEMENT].[PAD1,...]]\fR
	\fI[[SRCELEMENT].[PAD1,...]]\fR : CAPS : \fI[[SINKELEMENT].[PAD1,...]]\fR

	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.
	.br
	So the simplest link is a simple exclamation mark, that links the element to
	the left of it to the element right of it.
	.br
	Linking using the : operator attempts to link all possible pads between
	the elements
	.br

	.B Caps

	MEDIATYPE \fI[, PROPERTY[, PROPERTY ...]]]\fR \fI[; CAPS[; CAPS ...]]\fR

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

	.B Properties

	NAME=\fI[(TYPE)]\fRVALUE
	.br
	in lists and ranges: \fI[(TYPE)]\fRVALUE

	Sets the requested property in capabilities. The name is an alphanumeric value
	and the type can have the following case-insensitive values:
	.br
	- \fBi\fR or \fBint\fR for integer values or ranges
	.br
	- \fBf\fR or \fBfloat\fR for float values or ranges
	.br
	- \fBb\fR, \fBbool\fR or \fBboolean\fR for boolean values
	.br
	- \fBs\fR, \fBstr\fR or \fBstring\fR for strings
	.br
	- \fBfraction\fR for fractions (framerate, pixel\-aspect\-ratio)
	.br
	- \fBl\fR or \fBlist\fR for lists
	.br
	If no type was given, the following order is tried: integer, float, boolean,
	string.
	.br
	Integer values must be parsable by \fBstrtol()\fP, floats by \fBstrtod()\fP. FOURCC values may
	either be integers or strings. Boolean values are (case insensitive) \fIyes\fR,
	\fIno\fR, \fItrue\fR or \fIfalse\fR and may like strings be escaped with " or '.
	.br
	Ranges are in this format: [ VALUE, VALUE ]
	.br
	Lists use this format: { VALUE \fI[, VALUE ...]\fR }

	.SH "PIPELINE EXAMPLES"

	The examples below assume that you have the correct plug-ins available.
	In general, "pulsesink" can be substituted with another audio output
	plug-in such as "alsasink" or "osxaudiosink"
	Likewise, "xvimagesink" can be substituted with "ximagesink", "glimagesink",
	or "osxvideosink". Keep in mind though that different sinks might
	accept different formats and even the same sink might accept different formats
	on different machines, so you might need to add converter elements like
	audioconvert and audioresample (for audio) or videoconvert (for video)
	in front of the sink to make things work.

	.B Audio playback

	Play the mp3 music file "music.mp3" using a libmpg123-based plug-in and
	output to an Pulseaudio device
	.br
	.B
	gst\-launch\-1.0 filesrc location=music.mp3 ! mpegaudioparse ! mpg123audiodec ! audioconvert ! audioresample ! pulsesink

	Play an Ogg Vorbis format file
	.br
	.B
	gst\-launch\-1.0 filesrc location=music.ogg ! oggdemux ! vorbisdec ! audioconvert ! audioresample ! pulsesink

	Play an mp3 file or an http stream using GIO
	.br
	.B
	gst\-launch\-1.0 giosrc location=music.mp3 ! mpegaudioparse ! mpg123audiodec ! audioconvert ! pulsesink
	.br
	.B
	gst\-launch\-1.0 giosrc location=http://domain.com/music.mp3 ! mpegaudioparse ! mpg123audiodec ! audioconvert ! audioresample ! pulsesink

	Use GIO to play an mp3 file located on an SMB server
	.br
	.B
	gst\-launch\-1.0 giosrc location=smb://computer/music.mp3 ! mpegaudioparse ! mpg123audiodec ! audioconvert ! audioresample ! pulsesink

	.B Format conversion

	Convert an mp3 music file to an Ogg Vorbis file
	.br
	.B
	gst\-launch\-1.0 filesrc location=music.mp3 ! mpegaudioparse ! mpg123audiodec ! audioconvert ! vorbisenc ! oggmux ! filesink location=music.ogg

	Convert to the FLAC format
	.br
	.B
	gst\-launch\-1.0 filesrc location=music.mp3 ! mpegaudioparse ! mpg123audiodec ! audioconvert ! flacenc ! filesink location=test.flac

	.B Other

	Plays a .WAV file that contains raw audio data (PCM).
	.br
	.B
	gst\-launch\-1.0 filesrc location=music.wav ! wavparse ! audioconvert ! audioresample ! pulsesink

	Convert a .WAV file containing raw audio data into an Ogg Vorbis or mp3 file
	.br
	.B
	gst\-launch\-1.0 filesrc location=music.wav ! wavparse ! audioconvert ! vorbisenc ! oggmux ! filesink location=music.ogg
	.br
	.B
	gst\-launch\-1.0 filesrc location=music.wav ! wavparse ! audioconvert ! lamemp3enc ! filesink location=music.mp3

	Rips all tracks from compact disc and convert them into a single mp3 file
	.br
	.B
	gst\-launch\-1.0 cdparanoiasrc mode=continuous ! audioconvert ! lamemp3enc ! mpegaudioparse ! id3v2mux ! filesink location=cd.mp3

	Rips track 5 from the CD and converts it into a single mp3 file
	.br
	.B
	gst\-launch\-1.0 cdparanoiasrc track=5 ! audioconvert ! lamemp3enc ! mpegaudioparse ! id3v2mux ! filesink location=track5.mp3

	Using \fBgst\-inspect\-1.0\fR(1), it is possible to discover settings like the above
	for cdparanoiasrc that will tell it to rip the entire cd or only tracks of it.
	Alternatively, you can use an URI and gst\-launch\-1.0 will find an element (such as
	cdparanoia) that supports that protocol for you, e.g.:
	.B
	gst\-launch\-1.0 cdda://5 ! lamemp3enc vbr=new vbr\-quality=6 ! filesink location=track5.mp3

	Records sound from your audio input and encodes it into an ogg file
	.br
	.B
	gst\-launch\-1.0 pulsesrc ! audioconvert ! vorbisenc ! oggmux ! filesink location=input.ogg

	.B Video

	Display only the video portion of an MPEG-1 video file, outputting to
	an X display window
	.br
	.B
	gst\-launch\-1.0 filesrc location=JB_FF9_TheGravityOfLove.mpg ! dvddemux ! mpegvideoparse ! mpeg2dec ! xvimagesink

	Display the video portion of a .vob file (used on DVDs), outputting to
	an SDL window
	.br
	.B
	gst\-launch\-1.0 filesrc location=/flflfj.vob ! dvddemux ! mpegvideoparse ! mpeg2dec ! sdlvideosink

	Play both video and audio portions of an MPEG movie
	.br
	.B
	gst\-launch\-1.0 filesrc location=movie.mpg ! dvddemux name=demuxer demuxer. ! queue ! mpegvideoparse ! mpeg2dec ! sdlvideosink demuxer. ! queue ! mpegaudioparse ! mpg123audiodec ! audioconvert ! audioresample ! pulsesink

	Play an AVI movie with an external text subtitle stream
	.br
	.B
	gst\-launch\-1.0 filesrc location=movie.mpg ! mpegdemux name=demuxer demuxer. ! queue ! mpegvideoparse ! mpeg2dec ! videoconvert ! sdlvideosink demuxer. ! queue ! mpegaudioparse ! mpg123audiodec ! audioconvert ! audioresample ! pulsesink

	This example also shows how to refer to specific pads by name if an element
	(here: textoverlay) has multiple sink or source pads.
	.br
	.B
	gst\-launch\-1.0 textoverlay name=overlay ! videoconvert ! videoscale ! autovideosink filesrc location=movie.avi ! decodebin ! videoconvert ! overlay.video_sink filesrc location=movie.srt ! subparse ! overlay.text_sink

	Play an AVI movie with an external text subtitle stream using playbin
	.br
	.B
	gst\-launch\-1.0 playbin uri=file:///path/to/movie.avi suburi=file:///path/to/movie.srt

	.B Network streaming

	Stream video using RTP and network elements.

	This command would be run on the transmitter
	.br
	.B
	gst\-launch\-1.0 v4l2src ! video/x\-raw,width=128,height=96,format=UYVY ! videoconvert ! ffenc_h263 ! video/x\-h263 ! rtph263ppay pt=96 ! udpsink host=192.168.1.1 port=5000

	Use this command on the receiver
	.br
	.B
	gst\-launch\-1.0 udpsrc port=5000 ! application/x\-rtp, clock\-rate=90000,payload=96 ! rtph263pdepay queue\-delay=0 ! ffdec_h263 ! xvimagesink

	.B Diagnostic

	Generate a null stream and ignore it (and print out details).
	.br
	.B
	gst\-launch\-1.0 \-v fakesrc num\-buffers=16 ! fakesink

	Generate a pure sine tone to test the audio output
	.br
	.B
	gst\-launch\-1.0 audiotestsrc ! audioconvert ! audioresample ! pulsesink

	Generate a familiar test pattern to test the video output
	.br
	.B
	gst\-launch\-1.0 videotestsrc ! xvimagesink
	.br
	.B
	gst\-launch\-1.0 videotestsrc ! ximagesink

	.B Automatic linking

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

	Play any supported audio format
	.br
	.B
	gst\-launch\-1.0 filesrc location=musicfile ! decodebin ! audioconvert ! audioresample ! pulsesink

	Play any supported video format with video and audio output. Threads are used
	automatically. To make this even easier, you can use the playbin element:
	.br
	.B
	gst\-launch\-1.0 filesrc location=videofile ! decodebin name=decoder decoder. ! queue ! audioconvert ! audioresample ! pulsesink decoder. ! videoconvert ! xvimagesink
	.br
	.B
	gst\-launch\-1.0 playbin uri=file:///home/joe/foo.avi


	.B Filtered connections

	These examples show you how to use filtered caps.

	Show a test image and use the YUY2 or YV12 video format for this.
	.br
	.B
	gst\-launch\-1.0 videotestsrc ! 'video/x\-raw,format=YUY2;video/x\-raw,format=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.
	.br
	.B
	gst\-launch\-1.0 pulsesrc ! 'audio/x\-raw,rate=[32000,64000],format={S16LE,S24LE,S32LE}' ! wavenc ! filesink location=recording.wav


	.SH "ENVIRONMENT VARIABLES"
	.TP
	\fBGST_DEBUG\fR
	Comma-separated list of debug categories and levels (e.g.
	GST_DEBUG=totem:4,typefind:5). '*' is allowed as a wildcard as part of
	debug category names (e.g. GST_DEBUG=sink:6,audio*:6). Since 1.2.0 it is
	also possible to specify the log level by name (1=ERROR, 2=WARN, 3=FIXME,
	4=INFO, 5=DEBUG, 6=LOG, 7=TRACE, 9=MEMDUMP) (e.g. GST_DEBUG=audio:LOG)
	.TP
	\fBGST_DEBUG_NO_COLOR\fR
	When this environment variable is set, coloured debug output is disabled.
	.TP
	\fBGST_DEBUG_DUMP_DOT_DIR\fR
	When set to a filesystem path, store 'dot' files of pipeline graphs there.
	These can then later be converted into an image using the 'dot' utility from
	the graphviz set of tools, like this: dot foo.dot \-Tsvg \-o foo.svg (png or jpg
	are also possible as output format). There is also a utility called 'xdot'
	which allows you to view the .dot file directly without converting it first.
	.br
	When the pipeline changes state through NULL to PLAYING and back to NULL, a
	dot file is generated on each state change. To write a snapshot of the
	pipeline state, send a SIGHUP to the process.
	.TP
	\fBGST_REGISTRY\fR
	Path of the plugin registry file. Default is
	~/.cache/gstreamer\-1.0/registry\-CPU.bin where CPU is the
	machine/cpu type GStreamer was compiled for, e.g. 'i486', 'i686', 'x86\-64', 'ppc',
	etc. (check the output of "uname \-i" and "uname \-m" for details).
	.TP
	\fBGST_REGISTRY_UPDATE\fR
	Set to "no" to force GStreamer to assume that no plugins have changed,
	been added or been removed. This will make GStreamer skip the initial check
	whether a rebuild of the registry cache is required or not. This may be useful
	in embedded environments where the installed plugins never change. Do not
	use this option in any other setup.
	.TP
	\fBGST_PLUGIN_PATH\fR
	Specifies a list of directories to scan for additional plugins.
	These take precedence over the system plugins.
	.TP
	\fBGST_PLUGIN_SYSTEM_PATH\fR
	Specifies a list of plugins that are always loaded by default. If not set,
	this defaults to the system-installed path, and the plugins installed in the
	user's home directory
	.TP
	\fBGST_DEBUG_FILE\fR
	Set this variable to a file path to redirect all GStreamer debug
	messages to this file. If left unset, debug messages with be output
	unto the standard error.
	.TP
	\fBORC_CODE\fR
	Useful Orc environment variable. Set ORC_CODE=debug to enable debuggers
	such as gdb to create useful backtraces from Orc-generated code. Set
	ORC_CODE=backup or ORC_CODE=emulate if you suspect Orc's SIMD code
	generator is producing incorrect code. (Quite a few important
	GStreamer plugins like videotestsrc, audioconvert or audioresample use Orc).
	.TP
	\fBG_DEBUG\fR
	Useful GLib environment variable. Set G_DEBUG=fatal_warnings to make
	GStreamer programs abort when a critical warning such as an assertion failure
	occurs. This is useful if you want to find out which part of the code caused
	that warning to be triggered and under what circumstances. Simply set G_DEBUG
	as mentioned above and run the program in gdb (or let it core dump). Then get
	a stack trace in the usual way.
	.
	.SH FILES
	.TP 8
	~/.cache/gstreamer\-1.0/registry\-*.bin
	The plugin cache; can be deleted at any time, will be re-created
	automatically when it does not exist yet or plugins change. Based on
	XDG_CACHE_DIR, so may be in a different location than the one suggested.
	.
	.SH "SEE ALSO"
	.BR gst\-inspect\-1.0 (1),
	.BR gst\-launch\-1.0 (1),
	.SH "AUTHOR"
	The GStreamer team at http://gstreamer.freedesktop.org/