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-rw-r--r--DOCS/tech/vop.txt3
1 files changed, 2 insertions, 1 deletions
diff --git a/DOCS/tech/vop.txt b/DOCS/tech/vop.txt
index 12906a8e8a..6ce72e49b7 100644
--- a/DOCS/tech/vop.txt
+++ b/DOCS/tech/vop.txt
@@ -62,7 +62,8 @@ Current plugins:
note: if -zoom is used, and underlaying filters (including libvo)
uncapable of scaling, then it defaults to d_width/d_height !
note 2: w/h values -1 means original width/height, 0 means scaled
- d_width/d_height
+ d_width/d_height. -2/-3 means calculating w or h using the other
+ dimension and the original (-3) or prescaled (-2) aspect ratio.
MPI: TEMP, accepts stride
Special: dec_video and mpcodecs core autoloads it for colorspace conv.