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DOCS/man: improve explanation on how to shift notes with --pitch

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Previously, this was in the rubberband filter but it gives out random
numbers without explaning where they come from. Move it to the --pitch
section instead and reword it a bit. Closes #14652.
This commit is contained in:
Dudemanguy 2024-08-08 12:37:20 -05:00
parent 88885c0401
commit 70fad1daa6
2 changed files with 20 additions and 4 deletions
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5
DOCS/man/af.rst
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@ -226,10 +226,7 @@ Available filters are:
using the standard ``speed`` property, not ``af-command``.
``multiply-pitch <factor>``
Multiply the current value of ``<pitch-scale>`` dynamically. For
example: 0.5 to go down by an octave, 1.5 to go up by a perfect fifth.
If you want to go up or down by semi-tones, use 1.059463094352953 and
0.9438743126816935
Multiply the current value of ``<pitch-scale>`` dynamically.
``lavfi=graph``
Filter audio using FFmpeg's libavfilter.

19
DOCS/man/options.rst
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@ -242,6 +242,25 @@ Playback Control
affect playback speed. Playing with an altered pitch automatically inserts
the ``scaletempo2`` audio filter.
In a standard 12-tone scale system, octaves are separated by a factor of 2
whereas semitones are represented by a factor of 2^(1/12). This means
pitches can easily be shifted up or down with a simple multiplier.
.. admonition:: Examples
``--pitch=2``
Shifts the pitch up a full octave.
``--pitch=0.5``
Shifts the pitch down an octave.
``--pitch=1.498307`` (2^(7/12))
Shifts the pitch up a perfect fifth.
``--pitch=0.667420`` (2^(-7/12))
Shifts the pitch down a perfect fifth.
``--pitch=1.059463`` (2^(1/12))
Shifts the pitch up a semitone.
``--pitch=0.943874`` (2^(-1/12))
Shifts the pitch down a semitone.
``--pause``
Start the player in paused state.