avfilter/vsrc_gradients: add duration option

1 files changed, 8 insertions, 0 deletions

diff --git a/doc/filters.texi b/doc/filters.texi
index b0cdf92845..40d493fcae 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -22569,6 +22569,14 @@ Set number of colors to use at once. Allowed range is from 2 to 8. Default value
 
 @item seed
 Set seed for picking gradient line points.
+
+@item duration, d
+Set the duration of the sourced video. See
+@ref{time duration syntax,,the Time duration section in the ffmpeg-utils(1) manual,ffmpeg-utils}
+for the accepted syntax.
+
+If not specified, or the expressed duration is negative, the video is
+supposed to be generated forever.
 @end table