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Diffstat (limited to 'libavcodec/mpeg4video.c')
-rw-r--r--libavcodec/mpeg4video.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/libavcodec/mpeg4video.c b/libavcodec/mpeg4video.c
index a647960a51..dd4dd8ad95 100644
--- a/libavcodec/mpeg4video.c
+++ b/libavcodec/mpeg4video.c
@@ -137,7 +137,7 @@ int ff_mpeg4_set_direct_mv(MpegEncContext *s, int mx, int my){
} else if(IS_INTERLACED(colocated_mb_type)){
s->mv_type = MV_TYPE_FIELD;
for(i=0; i<2; i++){
- int field_select= s->next_picture.ref_index[0][s->block_index[2*i]];
+ int field_select= s->next_picture.ref_index[0][4*mb_index + 2*i];
s->field_select[0][i]= field_select;
s->field_select[1][i]= i;
if(s->top_field_first){