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Split and re-encode a CUE sheet.
================================
CUE sheets are sometimes distributed along with a single audio file containing a whole CD.
Liquidsoap can parse CUE sheets as playlists and use them in your request-based sources.
Here's for instance an example of a simple code to split a CUE sheet into several mp3 files
with `id3v2` tags:
```liquidsoap
# Log to stdout
log.file.set(false)
log.stdout.set(true)
log.level.set(4)
# Initial playlist
cue = "/path/to/sheet.cue"
# Create a reloadable playlist with this CUE sheet.
# Tell liquidsoap to shutdown when we are done.
x = playlist.reloadable(cue, on_done=shutdown)
# We will never reload this playlist so we drop the first
# returned value:
s = snd(x)
# Add a cue_cut to cue-in/cue-out according to
# markers in "sheet.cue"
s = cue_cut(s)
# Shove all that to a output.file operator.
output.file(%mp3(id3v2=true,bitrate=320),
fallible=true,
reopen_on_metadata=true,
"/path/to/$(track) - $(title).mp3",
s)
```
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