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-rw-r--r--doc/filters.texi4
1 files changed, 4 insertions, 0 deletions
diff --git a/doc/filters.texi b/doc/filters.texi
index d0ff3d470f..cbb16f22b2 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -22979,6 +22979,10 @@ for the accepted syntax.
If not specified, or the expressed duration is negative, the video is
supposed to be generated forever.
+Since the frame rate is used as time base, all frames including the last one
+will have their full duration. If the specified duration is not a multiple
+of the frame duration, it will be rounded up.
+
@item sar
Set the sample aspect ratio of the sourced video.