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-rw-r--r--DOCS/man/vo.rst6
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diff --git a/DOCS/man/vo.rst b/DOCS/man/vo.rst
index 7da0d2efff..4fdc0e26c7 100644
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+++ b/DOCS/man/vo.rst
@@ -340,6 +340,12 @@ Available video output drivers are:
Scale parameter (``t``). Increasing this makes the result blurrier.
Defaults to 1.
+ ``ewa_lanczos``, ``ewa_ginseng``, ``ewa_hanning``
+ Jinc function scaling factor (also known as a blur factor).
+ Decreasing this makes the result sharper, increasing it makes it
+ blurrier. Defaults to 1. Note that setting this too low (eg. 0.5)
+ leads to bad results. It's recommended to stay between 0.9 and 1.1.
+
``scale-radius=<r>``
Set radius for filters listed below, must be a float number between 1.0
and 16.0. Defaults to be 3.0 if not specified.