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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 making it higher than the number of cores can actually make it
slower. 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`` ``vapoursynth-lazy``
The same as ``vapoursynth``, but doesn't load Python scripts. Instead, a 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 custom backend using Lua and the raw VapourSynth API is used. The syntax