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