gstreamer/tools/README

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gst-launch
================
This is a tool that will construct pipelines based on a command-line
syntax. The syntax is rather complex to enable all the features I want it
to have, but should be easy to use for most people. Multi-pathed and
feedback pipelines are the most complex.
A simple commandline looks like:
gst-launch filesrc location=music.mp3 ! mad ! osssink
This plays an mp3 music file music.mp3 using libmad, and:
gst-launch filesrc location=music.mp3 ! mp3parse ! mpg123 ! osssink
Plays and mp3 music file using mpg123
You can also stream files over http:
gst-launch httpsrc location=http://domain.com/music.mp3 ! mad ! osssink
And using gnome-vfs you can do the same with:
gst-launch gnomevfssrc location=music.mp3 ! mad ! osssink
gst-launch gnomevfssrc location=http://domain.com/music.mp3 ! mad ! osssink
And too play the same song with gnome-vfs via smb:
gst-launch gnomevfssrc location=smb://computer/music.mp3 ! mad ! osssink
Here we convert a Mp3 file into an Ogg Vorbis file:
gst-launch filesrc location=music.mp3 ! mad ! vorbisenc ! filesink location=music.ogg
And then we can play that file with:
gst-launch filesrc location=music.ogg ! oggdemux ! vorbisdec ! audioconvert ! osssink
Some other useful pipelines are..
Plays wav files (currently there are no wav encoders):
gst-launch filesrc location=music.wav ! wavparse ! osssink
Converts wav files into mp3 and ogg files:
gst-launch filesrc location=music.wav ! wavparse ! vorbisenc ! filesink location=music.ogg
gst-launch filesrc location=music.wav ! wavparse ! mpegaudio ! filesink location=music.mp3
You can also use lame for mp3 encoding if you have it installed, it does a
much better job than mpegaudio.
Rips all songs from cd and saves them into a mp3 file:
gst-launch cdparanoia ! mpegaudio ! filesink location=cd.mp3
You can toy around with gst-inspect to discover the settings for
cdparanoia to rip individual tracks
Record sound from your sound input and encode it into an ogg file:
gst-launch osssrc ! vorbisenc ! filesink location=input.ogg
gst-launch not only handles audio but video as well:
For mpeg1 files (video and audio streams respectively):
gst-launch filesrc location=video.mpg ! mpegdemux video_00! { queue ! mpeg2dec ! sdlvideosink }
gst-launch filesrc location=video.mpg ! mpegdemux audio_00! { queue ! mad ! osssink }
for mpeg1 with both audio and video (for glib2):
gst-launch filesrc location=video.mpg ! mpegdemux name=demux video_00! { queue ! mpeg2dec ! sdlvideosink } demux.audio_00! { queue ! mad ! osssink }
for mpeg1 with both audio and video (for gtk1.2, the shim doesn't handle the 'name' property yet):
gst-launch filesrc location=video.mpg ! mpegdemux video_00! { queue ! mpeg2dec ! sdlvideosink } mpegdemux0.audio_00! { queue ! mad ! osssink }
For mpeg2 files (video and audio streams respectively):
gst-launch filesrc location=video.mpeg ! mpegdemux video_00! { queue ! mpeg2dec ! sdlvideosink }
gst-launch filesrc location=video.mpeg ! mpegdemux private_stream_1.0! { queue ! a52dec ! osssink }
for mpeg2 with both audio and video (glib2):
gst-launch filesrc location=video.mpg ! mpegdemux name=demux video_00! { queue ! mpeg2dec ! sdlvideosink } demux.private_stream_1.0! { queue ! a52dec ! osssink }
Note: The types of audio streams in the mpeg files can vary!
For an avi file (DivX, mjpeg,...)
gst-launch filesrc location=video.avi ! avidecoder video_00! { queue ! sdlvideosink } avidecoder0.audio_00! { queue ! osssink }
gst-complete
==================
This is a simple utility which provides custom bash completion when
typing gst-launch commands.
Simply run "gst-compprep" as root to build the registry of completions,
and then put, in your .bashrc,
"complete -C gst-complete gst-launch"
(ensuring that gst-complete is on your path).
You can then enjoy context sensitive tab-completion of gst-launch
commands.
gst-inspect
=================
Allows you to check the properties of plugins and elements.
./gst-inspect
will show all the plugins available and the elements they contain.
./gst-inspect <pluginname/elementname>
shows more info about the plugin/element.
gst-xmlinspect
=================
Dump properties of plugins and elements in an xml format. You can
transform the xml to something else with an appropriate stylesheet.
./gst-xmlinspect <elementname> | xsltproc xml2text.xsl -