Hi,
it works! 30 seconds after finishing the playback the Raspi shuts down -
thanks again, Nick!
I imagine that 30 sec. is the default value. It's a little short,
however, when it comes to jumping of the sofa, running to the turntable
and put another record to play ;)
I've read that with Liquidsoap's blank operators you can fine-tune the
length and threshold parameters.
I have been trying to do so with on_blank, following the samples for
skip_blank etc.:
source = on_blank(handler,length=120.,phono)
The result is that Liquidsoap doesn't start any longer.
Hence my questions (it seems that bthere is no documentation on the
on_blank params?):
1. How can I define the minimum length a blank must have in order to be
recognized as such?
2. How can I avoid that the shutdown script is triggered after starting
the Raspi and before any record has been played, e.g. in cases that it
takes longer to find the record, clean it etc.?
In other words: The perfect setup for this vinyl streamer would be:
- Start the Raspi
- Liquidsoap is waiting (indefinitely) for the first record to be played
- Liquidsoap triggers the shutdown script after the amount of time
defined for on_blank recognition.
Thanks & best regards
Martin
Am 04.12.2017 um 12:35 schrieb Nicholas Vrtis:
It looks like you are trying to output the source 'phono', but it is
the source 'source' that has the 'on_blank'.
It might be helpful to see the log to see what it happening, and to
put a print in the on blank handler to make sure it is actually being
triggered.
Nick
On Mon, Dec 4, 2017 at 4:36 AM, Federico Allegretti
<[email protected] <mailto:[email protected]>> wrote:
And how do you resolve?
Il 01/dic/2017 01:15 PM, "Martin Knapp" <[email protected]
<mailto:[email protected]>> ha scritto:
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”";
<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
<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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