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-rw-r--r--libavcodec/motion_est.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/libavcodec/motion_est.c b/libavcodec/motion_est.c
index 0967b7bb84..82b5f766ec 100644
--- a/libavcodec/motion_est.c
+++ b/libavcodec/motion_est.c
@@ -901,6 +901,8 @@ static int interlaced_search(MpegEncContext *s, int ref_index,
int16_t (*mv_table)[2]= mv_tables[block][field_select];
if(user_field_select){
+ assert(field_select==0 || field_select==1);
+ assert(field_select_tables[block][xy]==0 || field_select_tables[block][xy]==1);
if(field_select_tables[block][xy] != field_select)
continue;
}