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Diffstat (limited to 'doc/filters.texi')
-rw-r--r-- | doc/filters.texi | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/doc/filters.texi b/doc/filters.texi index a1b212d38a..9ddff533de 100644 --- a/doc/filters.texi +++ b/doc/filters.texi @@ -2695,6 +2695,69 @@ Set oversampling factor. This filter supports the all above options as @ref{commands}. +@section aspectralstats + +Display frequency domain statistical information about the audio channels. +Statistics are calculated and stored as metadata for each audio channel and for each audio frame. + +It accepts the following option: +@table @option +@item win_size +Set the window length in samples. Default value is 2048. +Allowed range is from 32 to 65536. + +@item win_func +Set window function. + +It accepts the following values: +@table @samp +@item rect +@item bartlett +@item hann, hanning +@item hamming +@item blackman +@item welch +@item flattop +@item bharris +@item bnuttall +@item bhann +@item sine +@item nuttall +@item lanczos +@item gauss +@item tukey +@item dolph +@item cauchy +@item parzen +@item poisson +@item bohman +@end table +Default is @code{hann}. + +@item overlap +Set window overlap. Allowed range is from @code{0} +to @code{1}. Default value is @code{0.5}. + +@end table + +A list of each metadata key follows: + +@table @option +@item mean +@item variance +@item centroid +@item spread +@item skewness +@item kurtosis +@item entropy +@item flatness +@item crest +@item flux +@item slope +@item decrease +@item rolloff +@end table + @section asr Automatic Speech Recognition |