diff options
author | Paul B Mahol <onemda@gmail.com> | 2015-11-30 13:36:58 +0100 |
---|---|---|
committer | Paul B Mahol <onemda@gmail.com> | 2015-12-04 17:52:57 +0100 |
commit | 5d2cc00dd01911a3ffab746230f0a54eea7957e1 (patch) | |
tree | d0cde3d182588a50130a1384bf8fe7ec8446a673 /doc | |
parent | 7234e04e358bc2afc7569954c8a690c3a713f002 (diff) | |
download | ffmpeg-5d2cc00dd01911a3ffab746230f0a54eea7957e1.tar.gz |
avfilter: add audio emphasis filter
Signed-off-by: Paul B Mahol <onemda@gmail.com>
Diffstat (limited to 'doc')
-rw-r--r-- | doc/filters.texi | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/doc/filters.texi b/doc/filters.texi index bf299cac12..12082de47d 100644 --- a/doc/filters.texi +++ b/doc/filters.texi @@ -528,6 +528,52 @@ aecho=0.8:0.9:1000|1800:0.3|0.25 @end example @end itemize +@section aemphasis +Audio emphasis filter creates or restores material directly taken from LPs or +emphased CDs with different filter curves. E.g. to store music on vinyl the +signal has to be altered by a filter first to even out the disadvantages of +this recording medium. +Once the material is played back the inverse filter has to be applied to +restore the distortion of the frequency response. + +The filter accepts the following options: + +@table @option +@item level_in +Set input gain. + +@item level_out +Set output gain. + +@item mode +Set filter mode. For restoring material use @code{reproduction} mode, otherwise +use @code{production} mode. Default is @code{reproduction} mode. + +@item type +Set filter type. Selects medium. Can be one of the following: + +@table @option +@item col +select Columbia. +@item emi +select EMI. +@item bsi +select BSI (78RPM). +@item riaa +select RIAA. +@item cd +select Compact Disc (CD). +@item 50fm +select 50µs (FM). +@item 75fm +select 75µs (FM). +@item 50kf +select 50µs (FM-KF). +@item 75kf +select 75µs (FM-KF). +@end table +@end table + @section aeval Modify an audio signal according to the specified expressions. |