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-rw-r--r--libavcodec/vp56.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/libavcodec/vp56.c b/libavcodec/vp56.c
index 5c7e93e5e6..530b890de1 100644
--- a/libavcodec/vp56.c
+++ b/libavcodec/vp56.c
@@ -401,6 +401,8 @@ static void vp56_decode_mb(VP56Context *s, int row, int col, int is_alpha)
frame_current = s->framep[VP56_FRAME_CURRENT];
frame_ref = s->framep[ref_frame];
+ if (mb_type != VP56_MB_INTRA && !frame_ref->data[0])
+ return;
ab = 6*is_alpha;
b_max = 6 - 2*is_alpha;