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:
- win_size
-
Set the window length in samples. Default value is 2048. Allowed range is from 32 to 65536.
- win_func
-
Set window function.
It accepts the following values:
- rect
- bartlett
- hann, hanning
- hamming
- blackman
- welch
- flattop
- bharris
- bnuttall
- bhann
- sine
- nuttall
- lanczos
- gauss
- tukey
- dolph
- cauchy
- parzen
- poisson
- bohman
- kaiser
Default is
hann. - overlap
-
Set window overlap. Allowed range is from
0to1. Default value is0.5. - measure
-
Select the parameters which are measured. The metadata keys can be used as flags, default is all which measures everything. none disables all measurement.
A list of each metadata key follows:
- mean
- variance
- centroid
- spread
- skewness
- kurtosis
- entropy
- flatness
- crest
- flux
- slope
- decrease
- rolloff