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-rw-r--r--doc/filters.texi2
1 files changed, 2 insertions, 0 deletions
diff --git a/doc/filters.texi b/doc/filters.texi
index a66900e160..3842886521 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -996,6 +996,8 @@ enable automatic detection
@end table
Default value is -1.
+If interlacing is unknown or decoder does not export this information,
+top field first will be assumed.
@c man end VIDEO FILTERS