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| author | Pavel Koshevoy <pkoshevoy@gmail.com> | 2012-06-17 12:35:57 +0200 |
|---|---|---|
| committer | Stefano Sabatini <stefasab@gmail.com> | 2012-06-17 12:50:35 +0200 |
| commit | a1aac8d004d1e3d415208fe0aea15b655826fb15 (patch) | |
| tree | 7c380e32622f834e71604e7d8aa285871e68cbba /doc | |
| parent | bc4da77b081b9bf60310c292c2f90330c4ffa04b (diff) | |
| download | ffmpeg-a1aac8d004d1e3d415208fe0aea15b655826fb15.tar.gz | |
lavfi: add atempo filter
Add atempo audio filter for adjusting audio tempo without affecting
pitch. This filter implements WSOLA algorithm with fast cross
correlation calculation in frequency domain.
Signed-off-by: Pavel Koshevoy <pavel@homestead.aragog.com>
Signed-off-by: Stefano Sabatini <stefasab@gmail.com>
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/filters.texi | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/doc/filters.texi b/doc/filters.texi index f2767cb974..a354e9703e 100644 --- a/doc/filters.texi +++ b/doc/filters.texi @@ -406,6 +406,24 @@ amovie=file.ogg [a] ; amovie=file.mp3 [b] ; [a2] [b2] amerge @end example +@section atempo + +Adjust audio tempo. + +The filter accepts exactly one parameter, the audio tempo. If not +specified then the filter will assume nominal 1.0 tempo. Tempo must +be in the [0.5, 2.0] range. + +For example, to slow down audio to 80% tempo: +@example +atempo=0.8 +@end example + +For example, to speed up audio to 125% tempo: +@example +atempo=1.25 +@end example + @section earwax Make audio easier to listen to on headphones. |