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diff --git a/doc/filters.texi b/doc/filters.texi
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@@ -24950,6 +24950,12 @@ Set sample aspect ration to 1/1.
Set sample aspect ratio to match input size of video
@end table
Default is @samp{none}.
+
+@item input
+Set input formats for filter to pick from.
+Can be @samp{all}, for selecting from all available formats,
+or @samp{first}, for selecting first available format.
+Default is @samp{first}.
@end table
@section weave, doubleweave