avfilter/asrc_anullsrc: add support to set output duration

1 files changed, 7 insertions, 0 deletions

diff --git a/doc/filters.texi b/doc/filters.texi
index ebe0d3301e..d0ff3d470f 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -6076,6 +6076,13 @@ Specifies the sample rate, and defaults to 44100.
 @item nb_samples, n
 Set the number of samples per requested frames.
 
+@item duration, d
+Set the duration of the sourced audio. 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 audio is
+supposed to be generated forever.
 @end table
 
 @subsection Examples