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-rw-r--r--doc/filters.texi3
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diff --git a/doc/filters.texi b/doc/filters.texi
index 68f17dd563..67587d96ee 100644
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@@ -21803,6 +21803,9 @@ Default is @code{3}.
Apply cross fade from one input video stream to another input video stream.
The cross fade is applied for specified duration.
+Both inputs must be constant frame-rate and have the same resolution, pixel format,
+frame rate and timebase.
+
The filter accepts the following options:
@table @option