diff options
author | Paul B Mahol <onemda@gmail.com> | 2015-08-04 15:41:35 +0300 |
---|---|---|
committer | Paul B Mahol <onemda@gmail.com> | 2015-08-19 19:15:13 +0300 |
commit | 2fa019958b4f8d1412f0e021c0c0aa0645ec6c7a (patch) | |
tree | f17f742e8043dfde6d6f39b066ac0bcac4e8920b /doc/filters.texi | |
parent | e6b8797b827ce3c5eb0608725db7e7e85d78864b (diff) |
avfilter: add showfreqs filter
Diffstat (limited to 'doc/filters.texi')
-rw-r--r-- | doc/filters.texi | 115 |
1 files changed, 115 insertions, 0 deletions
diff --git a/doc/filters.texi b/doc/filters.texi index e94ec40fc7..360ff6aca7 100644 --- a/doc/filters.texi +++ b/doc/filters.texi @@ -12704,6 +12704,121 @@ gamma=2:gamma2=2 @end itemize +@section showfreqs + +Convert input audio to video output representing the audio power spectrum. +Audio amplitude is on Y-axis while frequency is on X-axis. + +The filter accepts the following options: + +@table @option +@item size, s +Specify size of video. For the syntax of this option, check the +@ref{video size syntax,,"Video size" section in the ffmpeg-utils manual,ffmpeg-utils}. +Default is @code{1024x512}. + +@item mode +Set display mode. +This set how each frequency bin will be represented. + +It accepts the following values: +@table @samp +@item line +@item bar +@item dot +@end table +Default is @code{bar}. + +@item ascale +Set amplitude scale. + +It accepts the following values: +@table @samp +@item lin +Linear scale. + +@item sqrt +Square root scale. + +@item cbrt +Cubic root scale. + +@item log +Logarithmic scale. +@end table +Default is @code{log}. + +@item fscale +Set frequency scale. + +It accepts the following values: +@table @samp +@item lin +Linear scale. + +@item log +Logarithmic scale. + +@item rlog +Reverse logarithmic scale. +@end table +Default is @code{lin}. + +@item win_size +Set window size. + +It accepts the following values: +@table @samp +@item w16 +@item w32 +@item w64 +@item w128 +@item w256 +@item w512 +@item w1024 +@item w2048 +@item w4096 +@item w8192 +@item w16384 +@item w32768 +@item w65536 +@end table +Default is @code{w2048} + +@item win_func +Set windowing function. + +It accepts the following values: +@table @samp +@item rect +@item bartlett +@item hanning +@item hamming +@item blackman +@item welch +@item flattop +@item bharris +@item bnuttall +@item bhann +@item sine +@item nuttall +@end table +Default is @code{hanning}. + +@item overlap +Set window overlap. In range @code{[0, 1]}. Default is @code{1}, +which means optimal overlap for selected window function will be picked. + +@item averaging +Set time averaging. Setting this to 0 will display current maximal peaks. +Default is @code{1}, which means time averaging is disabled. + +@item color +Specify list of colors separated by space or by '|' which will be used to +draw channel frequencies. Unrecognized or missing colors will be replaced +by white color. +@end table + @section showspectrum Convert input audio to a video output, representing the audio frequency |