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manpage: explain "speed-adjusted" FPS for --interpolation-threshold 

Fixes #3528.
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wm4 2016-09-15 10:11:44 +02:00
parent 30d147687f
commit f143665864
1 changed files with 5 additions and 2 deletions
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7
DOCS/man/options.rst
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@ -3915,8 +3915,11 @@ The following video options are currently all specific to ``--vo=opengl`` and
``--interpolation-threshold=<0..1,-1>`` ``--interpolation-threshold=<0..1,-1>``
Threshold below which frame ratio interpolation gets disabled (default: Threshold below which frame ratio interpolation gets disabled (default:
``0.0001``). This is calculated as ``abs(disphz/vfps - 1) < threshold``, ``0.0001``). This is calculated as ``abs(disphz/vfps - 1) < threshold``,
where ``vfps`` is the speed-adjusted display FPS, and ``disphz`` the where ``vfps`` is the speed-adjusted video FPS, and ``disphz`` the
display refresh rate. display refresh rate. (The speed-adjusted video FPS is roughly equal to
the normal video FPS, but with slowdown and speedup applied. This matters
if you use ``--video-sync=display-resample`` to make video run synchronously
to the display FPS, or if you change the ``speed`` property.)
The default is intended to almost always enable interpolation if the The default is intended to almost always enable interpolation if the
playback rate is even slightly different from the display refresh rate. But playback rate is even slightly different from the display refresh rate. But