[FFmpeg-soc] [soc] Fix rounding for mpeg1 MVs.

[Alexander Strange]

---
 libavcodec/mpegvideo.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/libavcodec/mpegvideo.c b/libavcodec/mpegvideo.c
index b0ef63f..f3212da 100644
--- a/libavcodec/mpegvideo.c
+++ b/libavcodec/mpegvideo.c
@@ -1698,13 +1698,13 @@ int MPV_lowest_referenced_row(MpegEncContext *s, int dir)
 
     switch (s->mv_type) {
         case MV_TYPE_16X16:
-            off = (s->mv[dir][0][1] + 16) >> 5;
+            off = (s->mv[dir][0][1] + 31) >> 5;
             break;
         default:
             goto unhandled;
     }
 
-    return s->mb_y + off;
+    return FFMIN(s->mb_y + off, s->mb_height-1);
 unhandled:
     return s->mb_height-1;
 }

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