From 54d8386f52547f8abfb8fbad35b61cbfee3eed41 Mon Sep 17 00:00:00 2001
From: Gyan Doshi <ffmpeg@gyani.pro>
Date: Tue, 20 Apr 2021 09:32:50 +0530
Subject: doc/filters: note requirements for xfade inputs

---
 doc/filters.texi | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/doc/filters.texi b/doc/filters.texi
index 68f17dd563..67587d96ee 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -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
-- 
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