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Diffstat (limited to 'doc')
| -rw-r--r-- | doc/filters.texi | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/doc/filters.texi b/doc/filters.texi index 2f29c46f9c..8069554eb4 100644 --- a/doc/filters.texi +++ b/doc/filters.texi @@ -917,6 +917,7 @@ audio, the data is treated as if all the planes were concatenated. A list of Adler-32 checksums for each data plane. @end table +@anchor{astats} @section astats Display time domain statistical information about the audio channels. @@ -1394,6 +1395,24 @@ compand=.1|.1:.1|.1:-45.1/-45.1|-45/-900|0/-900:.01:45:-90:.1 @end example @end itemize +@section dcshift +Apply a DC shift to the audio. + +This can be useful to remove a DC offset (caused perhaps by a hardware problem +in the recording chain) from the audio. The effect of a DC offset is reduced +headroom and hence volume. The @ref{astats} filter can be used to determine if +a signal has a DC offset. + +@table @option +@item shift +Set the DC shift, allowed range is [-1, 1]. It indicates the amount to shift +the audio. + +@item limitergain +Optional. It should have a value much less than 1 (e.g. 0.05 or 0.02) and is +used to prevent clipping. +@end table + @section earwax Make audio easier to listen to on headphones. |