Fixes ticket #7494.

Signed-off-by: Marton Balint <c...@passwd.hu>
---
 libavcodec/mpeg_er.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libavcodec/mpeg_er.c b/libavcodec/mpeg_er.c
index ada1a1692f..f54cb8548b 100644
--- a/libavcodec/mpeg_er.c
+++ b/libavcodec/mpeg_er.c
@@ -78,6 +78,8 @@ static void mpeg_er_decode_mb(void *opaque, int ref, int 
mv_dir, int mv_type,
     ff_update_block_index(s);
 
     s->bdsp.clear_blocks(s->block[0]);
+    if (!s->chroma_y_shift)
+        s->bdsp.clear_blocks(s->block[6]);
 
     s->dest[0] = s->current_picture.f->data[0] +
                  s->mb_y * 16 * s->linesize +
-- 
2.16.4

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