From a1ed4ed852a064f08020caf95487f5c17ce33c67 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Tim-Philipp=20M=C3=BCller?= Date: Sat, 17 Dec 2005 14:19:27 +0000 Subject: [PATCH] tools/gst-launch.1.in: Update gst-launch man page; add a section with useful environment variables. Fixes #323882. Original commit message from CVS: * tools/gst-launch.1.in: Update gst-launch man page; add a section with useful environment variables. Fixes #323882. --- ChangeLog | 6 ++ tools/gst-launch.1.in | 213 ++++++++++++++++++++++++++++---------------------- 2 files changed, 126 insertions(+), 93 deletions(-) diff --git a/ChangeLog b/ChangeLog index fbff8b8..28d900c 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,3 +1,9 @@ +2005-12-17 Tim-Philipp Müller + + * tools/gst-launch.1.in: + Update gst-launch man page; add a section with useful + environment variables. Fixes #323882. + 2005-12-16 Stefan Kost * gst/gst.c: diff --git a/tools/gst-launch.1.in b/tools/gst-launch.1.in index 23857a1..11f9297 100644 --- a/tools/gst-launch.1.in +++ b/tools/gst-launch.1.in @@ -1,4 +1,4 @@ -.TH "GStreamer" "1" "April 2003" +.TH "GStreamer" "1" "December 2005" .SH "NAME" gst\-launch \- build and run a GStreamer pipeline .SH "SYNOPSIS" @@ -12,9 +12,13 @@ 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 above under -\fIpipeline description\fR or the GStreamer documentation. +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\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 @@ -26,21 +30,22 @@ Print help synopsis and available FLAGS .B \-v, \-\-verbose Output status information .TP 8 -.B \-XTYPE, \-\-exclude=TYPE, -Do not output status information of TYPE +.B \-m, \-\-messages +Output messages posted on the pipeline's bus .TP 8 -.B \-oFILE, \-\-output=FILE +.B \-t, \-\-tags +Output tags (also known as metadata) +.TP 8 +.B \-o FILE, \-\-output=FILE Save XML representation of pipeline to FILE and exit .TP 8 .B \-f, \-\-no_fault Do not install a fault handler .TP 8 -.B \-t, \-\-trace +.B \-T, \-\-trace Print memory allocation traces. The feature must be enabled at compile time to work. .TP 8 -.B \-i, \-\-iterations=N -Stop processing after N iterations. . .SH "GSTREAMER OPTIONS" @@ -52,17 +57,20 @@ to all GStreamer applications: 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. +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 seperated list of category_name:level pairs to specify debugging levels +A comma separated list of category_name:level pairs to specify debugging levels for each category. Level is in the range 0-5 where 0 will show no messages, and 5 will show all messages. The wildcard * can be used to match category names. Use \-\-gst\-debug\-help to show category names Example: -GST_CAT:5,GST_ELEMENT_*:3 +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 @@ -73,7 +81,8 @@ being 0. \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. +to print messages without color. Setting the \fBGST_DEBUG_NO_COLOR\fR +environment variable will achieve the same thing. .TP 8 .B \-\-gst\-disable\-debug Disables debugging. @@ -81,11 +90,6 @@ Disables debugging. .B \-\-gst\-debug\-help Prints a list of available debug categories and their default debugging level. .TP 8 -.B \-\-gst\-disable\-cpu\-opt -\fIGStreamer\fP normally automatically detects the capabilities of the -current CPU and selects the optimal implementation for some functions. -Using this flag disables detection, which is useful for debugging. -.TP 8 .B \-\-gst\-plugin\-spew \fIGStreamer\fP info flags to set Enable printout of errors while loading \fIGStreamer\fP plugins @@ -96,12 +100,6 @@ Add directories separated with ':' to the plugin search path .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 -.TP 8 -.B \-\-gst\-scheduler=SCHEDULER -Use SCHEDULER as the default scheduler -.TP 8 -.B \-\-gst\-registry=REGISTRY -Use the file REGISTRY as registry instead of the default .SH "PIPELINE DESCRIPTION" @@ -128,14 +126,13 @@ Enumeration properties can be set by name, nick or value. \fI[BINTYPE.]\fR ( \fI[PROPERTY1 ...]\fR PIPELINE-DESCRIPTION ) .br -{ \fI[PROPERTY1 ...]\fR PIPELINE-DESCRIPTION } 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. Using curly braces -(second line) is a short cut for using the first line and "thread" as the -BINTYPE. -.br -Please note the dot that has to be used after the BINTYPE. +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 @@ -154,10 +151,6 @@ specified and multiple links are done in the given order. 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 -Note that when specifying either pads or element names you have to include the -dot or your syntax will be misinterpreted. This is a change to the old syntax -used up to version 0.6 that allowed omitting the dot when only specifying a -padname. .B Caps @@ -186,6 +179,8 @@ and the type can have the following case-insensitive values: .br - \fBs\fR, \fBstr\fR or \fBstring\fR for strings .br +- \ffraction\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, @@ -212,19 +207,24 @@ There are currently no signals defined to go into the ready or pause 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". +plug-in such as "esdsink", "alsasink", "osxaudiosink", or "artsdsink". +Likewise, "xvimagesink" can be substituted with "ximagesink", "sdlvideosink", +"osxvideosink", or "aasink". 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 ffmpegcolorspace (for video) +in front of the sink to make things work. .B Audio playback .B - gst\-launch filesrc location=music.mp3 ! mad ! osssink + gst\-launch filesrc location=music.mp3 ! mad ! audioconvert ! audioresample ! osssink .br Play the mp3 music file "music.mp3" using a libmad-based plug-in and output to an OSS device .B - gst\-launch filesrc location=music.ogg ! oggdemux ! vorbisdec ! audioconvert ! osssink + gst\-launch filesrc location=music.ogg ! oggdemux ! vorbisdec ! audioconvert ! audioresample ! osssink .br Play an Ogg Vorbis format file @@ -232,161 +232,188 @@ Play an Ogg Vorbis format file gst\-launch gnomevfssrc location=music.mp3 ! mad ! osssink .br .B - gst\-launch gnomevfssrc location=http://domain.com/music.mp3 ! mad ! osssink + gst\-launch gnomevfssrc location=http://domain.com/music.mp3 ! mad ! audioconvert ! audioresample ! osssink .br Play an mp3 file or an http stream using GNOME\-VFS .B - gst\-launch gnomevfssrc location=smb://computer/music.mp3 ! mad ! osssink + gst\-launch gnomevfssrc location=smb://computer/music.mp3 ! mad ! audioconvert ! audioresample ! osssink .br Use GNOME\-VFS to play an mp3 file located on an SMB server .B Format conversion .B - gst\-launch filesrc location=music.mp3 ! mad ! vorbisenc ! filesink location=music.ogg + gst\-launch filesrc location=music.mp3 ! mad ! audioconvert ! vorbisenc ! oggmux ! filesink location=music.ogg .br Convert an mp3 music file to an Ogg Vorbis file .B - gst\-launch filesrc location=music.mp3 ! mad ! flacenc ! filesink location=test.flac + gst\-launch filesrc location=music.mp3 ! mad ! audioconvert ! flacenc ! filesink location=test.flac .br Convert to the FLAC format .B Other .B - gst\-launch filesrc location=music.wav ! wavparse ! osssink + gst\-launch filesrc location=music.wav ! wavparse ! audioconvert ! audioresample ! osssink .br -Plays a .WAV file +Plays a .WAV file that contains raw audio data (PCM). .B - gst\-launch filesrc location=music.wav ! wavparse ! vorbisenc ! filesink location=music.ogg + gst\-launch filesrc location=music.wav ! wavparse ! audioconvert ! vorbisenc ! oggmux ! filesink location=music.ogg .br .B - gst\-launch filesrc location=music.wav ! wavparse ! mpegaudio ! filesink location=music.mp3 + gst\-launch filesrc location=music.wav ! wavparse ! audioconvert ! lame ! filesink location=music.mp3 .br -Convert a .WAV file into Ogg Vorbis (or mp3) file - -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. +Convert a .WAV file containing raw audio data into an Ogg Vorbis or mp3 file .B - gst\-launch cdparanoia ! mpegaudio ! filesink location=cd.mp3 + gst\-launch cdparanoia ! lame ! filesink location=cd.mp3 .br -Rip all tracks from compact disc and convert them into a single mp3 file +rips all tracks from compact disc and convert them into a single mp3 file Using \fBgst\-inspect\fR(1), it is possible to discover settings for cdparanoia -that will tell it to rip individual tracks. +that will tell it to rip individual tracks. Alternatively, you can use an URI +and gst-launch will find an element (such as cdparanoia) that supports that +protocol for you, e.g.: +.B + gst\-launch cdda://5 ! lame vbr=new vbr-quality=6 ! filesink location=track5.mp3 .B - gst\-launch osssrc ! vorbisenc ! filesink location=input.ogg + gst\-launch osssrc ! audioconvert ! vorbisenc ! oggmux ! filesink location=input.ogg .br -Record sound from your audio input and encode it into an ogg file +records sound from your audio input and encodes it into an ogg file .B Video .B - gst\-launch filesrc location=JB_FF9_TheGravityOfLove.mpg ! mpegdemux ! mpeg2dec ! xvideosink + gst\-launch filesrc location=JB_FF9_TheGravityOfLove.mpg ! dvddemux ! mpeg2dec ! xvimagesink .br Display only the video portion of an MPEG-1 video file, outputting to an X display window .B - gst\-launch filesrc location=/flflfj.vob ! mpegdemux ! mpeg2dec ! sdlvideosink + gst\-launch filesrc location=/flflfj.vob ! dvddemux ! mpeg2dec ! sdlvideosink .br Display the video portion of a .vob file (used on DVDs), outputting to an SDL window .B - gst\-launch filesrc location=movie.mpg ! mpegdemux name=demuxer ! mpeg2dec ! sdlvideosink demuxer. ! mad ! osssink + gst\-launch filesrc location=movie.mpg ! dvddemux name=demuxer demuxer. ! queue ! mpeg2dec ! sdlvideosink demuxer. ! queue ! mad ! audioconvert ! audioresample ! osssink .br Play both video and audio portions of an MPEG movie .B - gst\-launch filesrc location=movie.mpg ! mpegdemux name=demuxer ! { queue ! mpeg2dec ! sdlvideosink } { demuxer. ! queue ! mad ! osssink } -.br -Use threaded output to improve synchronization and smoothness. Threads require -queues for buffering on thread boundaries - -.B - gst\-launch filesrc location=movie.avi ! avidemux name=demuxer ! { queue ! ffdecall ! sdlvideosink } { demuxer. ! queue ! mad ! osssink } + gst\-launch filesrc location=movie.mpg ! mpegdemux name=demuxer demuxer. ! queue ! mpeg2dec ! ffmpegcolorspace ! sdlvideosink demuxer. ! queue ! mad ! audioconvert ! audioresample ! osssink .br Play an AVI movie .B Network streaming -An MPEG\-1 system stream can be streamed via RTP from one machine to -another. +FIXME: give example pipelines using RTP and network elements. .B - gst\-launch rtprecv media_type=mpeg1_sys ! mpegdemux name=demuxer ! { queue ! mpeg2dec ! xvideosink } { demuxer. ! queue ! mad ! osssink } + FIXME: pipeline to send file .br Use this command on the receiver .B - gst\-launch filesrc location=mpeg1system.mpeg ! mpegparse ! rtpsend ip=IPorHostname + FIXME: pipeline to receive file .br This command would be run on the transmitter .B Diagnostic .B - gst\-launch fakesrc ! fakesink + gst\-launch -v fakesrc num-buffers=16 ! fakesink .br -Generate a null stream and ignore it +Generate a null stream and ignore it (and print out details). .B - gst\-launch audiotestsrc ! osssink + gst\-launch audiotestsrc ! audioconvert ! audioresample ! osssink .br -Generate a pure tone to test the audio output +Generate a pure sine tone to test the audio output .B - gst\-launch videotestsrc ! xvideosink + gst\-launch videotestsrc ! xvimagesink +.br +.B + gst\-launch videotestsrc ! ximagesink .br Generate a familiar test pattern to test the video output .B Automatic linking -You can use the spider element to automatically select the right elements to get -a working pipeline. +You can use the decodebin element to automatically select the right elements +to get a working pipeline. .B - gst\-launch filesrc location=musicfile ! spider ! osssink + gst\-launch filesrc location=musicfile ! decodebin ! audioconvert ! audioresample ! osssink .br Play any supported audio format .B - gst\-launch filesrc location=videofile ! spider name=spider ! osssink spider. ! xvideosink + gst\-launch filesrc location=videofile ! decodebin name=decoder decoder. ! queue ! audioconvert ! audioresample ! osssink decoder. ! ffmpegcolorspace ! xvimagesink .br +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: + .B - gst\-launch filesrc location=videofile ! spider name=spider ! { queue ! osssink } { spider. ! queue ! xvideosink } + gst\-launch playbin uri=file:///home/joe/foo.avi .br -Play any supported video format with video and audio output. The second pipeline -uses threaded output. + .B Filtered connections These examples show you how to use filtered caps. .B - gst\-launch videotestsrc ! video/raw, format:fourcc=YUY2; video/raw, format:fourcc=YV12 ! xvideosink + gst\-launch videotestsrc ! video/x-raw-yuv,format=\(fourcc\)YUY2;video/x-raw-yuv,format=\(fourcc\)YV12 ! xvimagesink .br Show a test image and use the YUY2 or YV12 video format for this. .B - gst\-launch osssrc ! "audio/raw", format=int, width=[16, 32], depth=(16, 24, 32), signed=TRUE ! osssink -.br -Playback currently recorded audio. Force usage of signed 16 to 32 bit samples. - - - - + gst\-launch osssrc ! 'audio/x-raw-int,rate=[32000,64000],width=[16,32],depth={16,24,32},signed=(boolean)true' ! wavenc ! filesink location=recording.wav +.br +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. + + +.SH "ENVIRONMENT VARIABLES" +.TP +\fBGST_DEBUG\fR +Comma-separated list of debug categories and levels, e.g. +GST_DEBUG=totem:4,typefind:5 +.TP +\fBGST_DEBUG_NO_COLOR\fR +When this environment variable is set, coloured debug output is disabled. +.TP +\fBGST_REGISTRY\fR +Describe me +.TP +\fBGST_PLUGIN_PATH\fR +Describe me +.TP +\fBGST_PLUGIN_SYSTEM_PATH\fR +Describe me +.TP +\fBOIL_CPU_FLAGS\fR +Useful liboil environment variable. Set OIL_CPU_FLAGS=0 when valgrind or +other debugging tools trip over liboil's CPU detection (quite a few important +GStreamer plugins like videotestsrc, audioconvert or audioresample use liboil). +.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 "SEE ALSO" -.BR gst\-complete (1), -.BR gst\-register (1), .BR gst\-inspect (1) +.BR gst\-typefind (1) +.BR gst\-feedback (1) .SH "AUTHOR" -The GStreamer team at http://gstreamer.net/ +The GStreamer team at http://gstreamer.freedesktop.org/ -- 2.7.4