avfilter/vf_waveform: add input option

For finer control of selected formats for filtering.

1 files changed, 6 insertions, 0 deletions

diff --git a/doc/filters.texi b/doc/filters.texi
index 7e0c87d0fa..c3cf8b470b 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -24950,6 +24950,12 @@ Set sample aspect ration to 1/1.
 Set sample aspect ratio to match input size of video
 @end table
 Default is @samp{none}.
+
+@item input
+Set input formats for filter to pick from.
+Can be @samp{all}, for selecting from all available formats,
+or @samp{first}, for selecting first available format.
+Default is @samp{first}.
 @end table
 
 @section weave, doubleweave