From f729bd9e05e778498df0e4ef7b01bec458b6a19a Mon Sep 17 00:00:00 2001
From: ls-2037 <95779145+ls-2037@users.noreply.github.com>
Date: Sun, 7 Apr 2024 13:21:52 -0400
Subject: demux_mkv: corrected direction of ProjectionPoseRoll rotation

See: ietf-wg-cellar/matroska-specification#822
Fixes: #13830
---
 demux/demux_mkv.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'demux/demux_mkv.c')

diff --git a/demux/demux_mkv.c b/demux/demux_mkv.c
index bd823b7b39..528edd9b8c 100644
--- a/demux/demux_mkv.c
+++ b/demux/demux_mkv.c
@@ -1576,7 +1576,7 @@ static int demux_mkv_open_video(demuxer_t *demuxer, mkv_track_t *track)
     sh_v->color = track->color;
 
     if (track->v_projection_pose_roll_set) {
-        int rotate = lrintf(fmodf(fmodf(track->v_projection_pose_roll, 360) + 360, 360));
+        int rotate = lrintf(fmodf(fmodf(-1 * track->v_projection_pose_roll, 360) + 360, 360));
         sh_v->rotate = rotate;
     }
 
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