Thanks again Nick, I really appreciate your help - and I feel pretty ashamed
for not having found the documentation you‘ve pointed me to.
Delaying shutdown with max_blank works perfectly, even with higher values (600)
Regarding on_noise and the variables, I‘ve spent a couple of hours studying the
documentation and the sample code, but didn‘t get very far. It‘s not trivial
for a non-programmer like me with only some superficial php and perl
knowledges. But I‘ll keep on trying.
Thanks & best regards
Martin
> Am 05.12.2017 um 22:41 schrieb Nicholas Vrtis <[email protected]>:
>
> Martin,
>
> If you look at the documentation for on_blank
> (http://liquidsoap.info/doc-dev/reference.html#on_blank), you can set the
> on_blank(max_blank=40.0, handler, phono)
>
> Note that max_blank takes a float, or you need the period.
>
> You can also specify an on_noise=dostartup
>
> So, what I would do is have the 'handler' check a Boolean to make sure the
> song has started, and only shutdown if it has.
>
> Then in the dostartup function, I would change the Boolean so that when
> 'handler' is called the next time (which would be after the end of the song),
> it would issue the shutdown.
>
> Check some of the examples on how to get and set a variable within functions.
>
> Nick
>
>
>> On Tue, Dec 5, 2017 at 5:22 AM, Martin Knapp <[email protected]> wrote:
>> 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]>
>>>> wrote:
>>>> And how do you resolve?
>>>>
>>>> Il 01/dic/2017 01:15 PM, "Martin Knapp" <[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”";, 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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