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-rw-r--r--doc/muxers.texi6
1 files changed, 6 insertions, 0 deletions
diff --git a/doc/muxers.texi b/doc/muxers.texi
index b2390e21c2..3f84450cfa 100644
--- a/doc/muxers.texi
+++ b/doc/muxers.texi
@@ -171,6 +171,12 @@ avconv -i in.avi -f image2 -frames:v 1 img.jpeg
@table @option
@item -start_number @var{number}
Start the sequence from @var{number}.
+
+@item -update @var{number}
+If @var{number} is nonzero, the filename will always be interpreted as just a
+filename, not a pattern, and this file will be continuously overwritten with new
+images.
+
@end table
@section MOV/MP4/ISMV