The spec says

9: Interlaced with bottom field displayed first and top field stored first
14: Interlaced with top field displayed first and bottom field stored first

And avcodec.h states

AV_FIELD_TB,          //< Top coded first, bottom displayed first
AV_FIELD_BT,          //< Bottom coded first, top displayed first

Signed-off-by: James Almer <jamr...@gmail.com>
---
Should also go into libav 12. This feature is only a couple months old
so it's not affecting any other stable release.

A check for files created with old lavf versions in the matroska demuxer
to detect wrongly muxed files and workaround them would also be a good
idea.
Minor version is bumped for this purpose.

 libavformat/matroska.h | 4 ++--
 libavformat/version.h  | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/libavformat/matroska.h b/libavformat/matroska.h
index a13de18..91bb978 100644
--- a/libavformat/matroska.h
+++ b/libavformat/matroska.h
@@ -233,8 +233,8 @@ typedef enum {
     MATROSKA_VIDEO_FIELDORDER_UNDETERMINED = 2,
     MATROSKA_VIDEO_FIELDORDER_TT           = 1,
     MATROSKA_VIDEO_FIELDORDER_BB           = 6,
-    MATROSKA_VIDEO_FIELDORDER_BT           = 9,
-    MATROSKA_VIDEO_FIELDORDER_TB           = 14,
+    MATROSKA_VIDEO_FIELDORDER_TB           = 9,
+    MATROSKA_VIDEO_FIELDORDER_BT           = 14,
 } MatroskaVideoFieldOrder;
 
 typedef enum {
diff --git a/libavformat/version.h b/libavformat/version.h
index a6643a9..c329c2f 100644
--- a/libavformat/version.h
+++ b/libavformat/version.h
@@ -30,7 +30,7 @@
 #include "libavutil/version.h"
 
 #define LIBAVFORMAT_VERSION_MAJOR 57
-#define LIBAVFORMAT_VERSION_MINOR  8
+#define LIBAVFORMAT_VERSION_MINOR  9
 #define LIBAVFORMAT_VERSION_MICRO  0
 
 #define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \
-- 
2.9.1

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