Hi,
Please apologize if I bring my question (below) up again, It seems that
I just can't resolve the on_blank issue by myself. I would be very
grateful for being pointed to some additional information and/or
examples (if they exist).
Regards
Martin
Am 23.11.2017 um 21:19 schrieb Martin Knapp:
Good morning everybody,
in the Slimdevices forums (LMS, squeezelite etc.) we've been looking
for a way to shut down a Raspberry Pi automatically after playing some
music when no sound is detected on the sound card any longer. This can
be helpful in our cases where we are recording or streaming "vinyl"
from vintage turntables into a multiroom enabled system like LMS.
For creating and transmitting the vinyl stream (FLAC), I use
Liquidsoap and Icecast. That works pretty fine, and I'm very thankful
for having discovered Liquidsoap.
My recipe is:
#!/usr/bin/liquidsoap
# set the path and permissions for the logfile
set("log.file.path","/var/log/liquidsoap/phono.log")
set("log.file.perms",777)
#set("log.unix_timestamps",true)
#input from soundcard
phono = input.alsa(bufferize=true,fallible=false,device="hw:0")
#stream it to local icecast, default port and password
output.icecast(%ogg(%flac(samplerate=44100,channels=2,compression=5,bits_per_sample=16)),
mount="/phono", name="Phono", format="audio/ogg",
description="Turntable FLAC", url="http://192.168.178.200”";,
genre = "Misc", phono)
Now we have been looking at the on_blank operator described in
http://liquidsoap.fm/doc-dev/blank.html, which seems to be able to do
the job of shutting down the Pi after finishing the playback of a
vinyl record. I created a shut down script (shut_on_blank.sh, owner:
root) and tried to insert:
def handler()
system("/etc/liquidsoap/shut_on_blank.sh")
end
source = on_blank(handler,phono)
into the .liq file above, but the result was that the entire stream
generation didn't work any longer.
What am I doing wrong?
The second question that arose was whether the length of the blank to
be detected as such can be configured with on_blank, too - as it seems
to be possible with max_blank= for strip_blank. When searching through
the mailing list, I also found a post saying that the default
threshold for blank detection is -40db, and that it can be adjusted -
but not how/where. It seems that we weren't able to find further
information on this in the docs.
Thanks for your help & best regards
Martin
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