Sorry, my bad, that makes more sense :D
Either way, the threshold is supposed to be dB - but I've seen
implementations of measuring dB that would make your hair curl!
On 19 February 2014 23:48, Matt Camp <[email protected]> wrote:
> Nope, I'm using strip_blank as I am dealing with a live input source, not
> a playlist.
>
> I fail over to a backup mp3 playlist if someone in the studio forgets to
> hit play on the auto-DJ or something.
>
>
>
> On 19 February 2014 08:48, John Plsek <[email protected]> wrote:
>
>> I think you want skip_blank not strip_blank
>>
>> the threshold is apparently power in dB
>> http://savonet.sourceforge.net/doc-svn/reference.html#skip_blank
>>
>>
>> On 19 February 2014 07:57, Matt Camp <[email protected]> wrote:
>>
>>> Hi,
>>>
>>> So I'm trying to tweak the silence detection for my script, however I am
>>> struggling to define what 'silence' actually is, and how the strip_blank
>>> threshold value relates to the output of rms()
>>>
>>> I've implemented rms() via the telnet server to measure values, however
>>> the values seem to vary quite a lot.
>>>
>>> For example:
>>>
>>> 1000hz sinewave @ 0dB: 0.436315828817 via rms()
>>> 1000hz sinewave @ -20dB: 0.418433339027 via rms()
>>> 1000hz sinewave @ -30dB: 0.418379714679 via rms()
>>>
>>>
>>> Yet to have strip_blank() trigger at around -30dB requires setting the
>>> threshold to -7.41
>>>
>>> Is there any way to relate these two measurements to each other? I am
>>> looking for a way to generate a reference tone at the specific volume where
>>> I want to trigger the silence detection without having to do endless trial
>>> and error adjusting the threshold.
>>>
>>> Fyi, relevant bits of my script:
>>>
>>> live = input.alsa(device="hw:0,0")
>>> duration = interactive.float("duration", 1.)
>>> rs = rms.stereo(duration=duration,live)
>>> r = fst(rs)
>>> live = snd(rs)
>>>
>>> def rms_left(_) = "#{fst(r())}" end
>>> def rms_right(_) = "#{snd(r())}" end
>>> server.register("rms_left",rms_left)
>>> server.register("rms_right",rms_right)
>>>
>>> backup = single("/outcast_config/backup.mp3")
>>> live = fallback(track_sensitive=false, [
>>> strip_blank(threshold=-7.41,max_blank=1.0,live) , backup ])
>>>
>>>
>>>
>>>
>>>
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>>
>>
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>
>
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