avfilter/af_amix: add sum option

1 files changed, 6 insertions, 0 deletions

diff --git a/doc/filters.texi b/doc/filters.texi
index 2d85a414ec..52bced3143 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -1879,6 +1879,11 @@ stream ends. The default value is 2 seconds.
 @item weights
 Specify weight of each input audio stream as sequence.
 Each weight is separated by space. By default all inputs have same weight.
+
+@item sum
+Do not scale inputs but instead do only summation of samples.
+Beware of heavy clipping if inputs are not normalized prior of filtering
+or output from @var{amix} normalized after filtering. By default is disabled.
 @end table
 
 @subsection Commands
@@ -1886,6 +1891,7 @@ Each weight is separated by space. By default all inputs have same weight.
 This filter supports the following commands:
 @table @option
 @item weights
+@item sum
 Syntax is same as option with same name.
 @end table