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manpage: vf_vapoursynth: document mpv-specific predefined variables

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wm4 2015-01-03 03:25:51 +01:00
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@ -760,6 +760,17 @@ Available filters are:
making it higher than the number of cores can actually make it
slower.
The following variables are defined by mpv:
``video_in``
The mpv video source as vapoursynth clip. Note that this has no length
set, which confuses many filters. Using ``Trim`` on the clip with a
high dummy length can turn it into a finite clip.
``video_in_dw``, ``video_in_dh``
Display size of the video. Can be different from video size if the
video does not use square pixels (e.g. DVD).
``vapoursynth-lazy``
The same as ``vapoursynth``, but doesn't load Python scripts. Instead, a
custom backend using Lua and the raw VapourSynth API is used. The syntax