manual/include/strip-silence-from-audio-regions.html

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<p>
From the region context menu, choose <kbd class="menu">Edit &gt; Strip
Silence</kbd> to detect silence (based on a user-chosen threshold in
<abbr title="Decibels relative to Full Scale">dBFS</abbr>), split a
region based on the boundaries of the silent segments, and remove the
silence. You can also specify a minimum length for silence&mdash;useful
when editing very percussive material and just needing to
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automatically trim the ends of a region. The dialog looks like this:
</p>
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<img src="/images/a3_strip_silence.png" alt="strip silence dialog" />
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<p>
The edit applies to all selected regions, allowing batch processing.
You can also see in the screenshot how the main editor window is used
to show silent segments and report the number and durations of the
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shortest segments.
</p>