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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