Liquidsoap
| Website | http://liquidsoap.info/ |
|---|---|
| License | GPL |
| OS | GNU/Linux, OS X, Windows |
| Media | Streaming media |
| Format | OGG, MP3 |
| Interface | Custom programming language |
| Wikipedia | http://en.wikipedia.org/wiki/Draft:Liquidsoap |
| Thumbnail |
Sound processing
liquidsoap can be used to process / filter sound either in a streaming pipeline, or used "offline" to directly produce an audio output (file).
See https://www.liquidsoap.info/doc-1.4.2/reference.html#source-sound-processing
Links / Projects / Radio streams that use liquidsoap
- Data Radio. Here a script created a day and night playlist, with a "fallback" to allow a live stream to interrupt.
playlist
playlist source
mode (of type string, which defaults to "randomize"): Play the files in the playlist either in the order (“normal” mode), or shuffle the playlist each time it is loaded, and play it in this order for a whole round (“randomize” mode), or pick a random file in the playlist each time (“random” mode).
say_metadata
say_metadata filter
outputs
Basic outputs of interest:
- out which is the shortcut for output.preferred: play to the soundcard directly (if possible)
- output.file: play to a file
- output.icecast Send audio to an icecast server
examples
liquidsoap 'out(noise())'
liquidsoap 'out(playlist("playlist.pls"))'
liquidsoap 'output.prefered(mksafe(playlist("playlist.pls")))'
liquidsoap 'output.file(%mp3,"output.mp3",mksafe(playlist("playlist.pls")))'
with playlist.pls:
brown.ogg
Observations:
- WAV files don't seem to work, but ogg + mp3 seem OK! (or was this the stereo problem)
- explicit output modules (like output.file) seem to require the use of mksafe (out doesn't need this).
Doesn't work with mono source material -- default seems to be stereo...
[decoder:3] Unable to decode "./speech0001.mp3" as {audio=2;video=0;midi=0}!
2020/05/11 17:42:04 [decoder.mad:3] File "./speech0003.mp3" has an incompatible number of channels.
WAV file "speech0001.wav" has content type {audio=1;video=0;midi=0} but {audio=2;video=0;midi=0} was expected.
How would you output a mono audio stream?