@@ -856,7 +856,7 @@ static int dirac_unpack_prediction_parameters(DiracContext *s)

     /*[DIRAC_STD] 11.2.4 motion_data_dimensions()

       Calculated in function dirac_unpack_block_motion_data */

-    if (s->plane[0].xbsep < s->plane[0].xblen/2 || s->plane[0].ybsep < s->plane[0].yblen/2) {

+    if (!s->plane[0].xbsep || !s->plane[0].ybsep || s->plane[0].xbsep < s->plane[0].xblen/2 || s->plane[0].ybsep < s->plane[0].yblen/2) {

         av_log(s->avctx, AV_LOG_ERROR, "Block separation too small\n");

         return -1;

     }