Update the filters documentation to include the new scale2ref
constants.
Signed-off-by: Kevin Mark <kmark...@gmail.com>
---
doc/filters.texi | 26 +++++++++++++++++++++++++-
1 file changed, 25 insertions(+), 1 deletion(-)
diff --git a/doc/filters.texi b/doc/filters.texi
index a0ab2fb0c7..ff41402f7e 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -12429,7 +12429,31 @@ Supersampling
Scale (resize) the input video, based on a reference video.
See the scale filter for available options, scale2ref supports the same but
-uses the reference video instead of the main input as basis.
+uses the reference video instead of the main input as basis. scale2ref also
+supports the following additional constants for the @option{w} and
+@option{h} options:
+
+@table @var
+@item other_w
+@item other_h
+The non-reference video's width and height
+
+@item other_a
+The same as @var{other_w} / @var{other_h}
+
+@item other_sar
+The non-reference video's sample aspect ratio
+
+@item other_dar
+The non-reference video's display aspect ratio. Calculated from
+@code{(other_w / other_h) * other_sar}.
+
+@item other_hsub
+@item other_vsub
+The non-reference video's horizontal and vertical chroma subsample values.
+For example for the pixel format "yuv422p" @var{hsub} is 2 and @var{vsub}
+is 1.
+@end table
@subsection Examples
--
2.13.0
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