duration is a positive integer that specifies the minimum duration of a silent sequence on a file to be reported. the value is treated as a sample number unless a format specifier is used. see the FORMATS section below for information. the default value is one second.
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when this option is set, all the silent sequences greater than duration will be shrinked down to duration and the file size truncated accordingly.
-t <threshold>, --threshold=<threshold>
threshold is a percentage value respect the maximum (absolute) sample value. samples whose value is under the given threshold are considered silent. for example, a value of 2 means that all samples with absolute value under the 2% will be treated as silent samples. the default value is 0.
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the following modifiers are provided:
value is interpreted as milliseconds.
value is interpreted as minutes.
value is interpreted as seconds.
value is interpreted as bytes.
value is interpreted as kbytes (1024 bytes).
value is interpreted as megabytes (1024 kbytes).
in either case, the values specified will be rounded to get an integer number of samples.
tests has been done only with 44100 Hz 16 bit stereo files, though it may work with mono/stereo 8/16 bits files.