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-rw-r--r--doc/filters.texi7
1 files changed, 6 insertions, 1 deletions
diff --git a/doc/filters.texi b/doc/filters.texi
index 7f07848..9fae339 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -6820,7 +6820,12 @@ input display aspect ratio. Calculated from @code{(iw / ih) * sar}.
@item hsub
@item vsub
-horizontal and vertical chroma subsample values. For example for the
+horizontal and vertical input chroma subsample values. For example for the
+pixel format "yuv422p" @var{hsub} is 2 and @var{vsub} is 1.
+
+@item ohsub
+@item ovsub
+horizontal and vertical output chroma subsample values. For example for the
pixel format "yuv422p" @var{hsub} is 2 and @var{vsub} is 1.
@end table
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