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doc/filters: indicate commands for zscale
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@ -20445,7 +20445,17 @@ horizontal and vertical output chroma subsample values. For example for the
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pixel format "yuv422p" @var{hsub} is 2 and @var{vsub} is 1.
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@end table
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@subsection Commands
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This filter supports the following commands:
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@table @option
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@item width, w
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@item height, h
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Set the output video dimension expression.
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The command accepts the same syntax of the corresponding option.
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If the specified expression is not valid, it is kept at its current
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value.
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@end table
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@c man end VIDEO FILTERS
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