Warning: -n introduces a power-gain of about 11dB in the filter, so beware of output clipping. Normally, when trimming silence from beginning of audio the above-periods will be 1 but it can be increased to higher values to trim all audio up to a specific count of non-silence periods. The width parameter gives the slope of the drop. See also sinc for a bandpass filter with steeper shoulders. Dani Klarinah Dani : K.
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