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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