Check direct_8x8_inference_flag.

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@21668 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

libavcodec/h264_ps.c

@@ -347,6 +347,10 @@ int ff_h264_decode_seq_parameter_set(H264Context *h){
         sps->mb_aff= 0;
 
     sps->direct_8x8_inference_flag= get_bits1(&s->gb);
+    if(!sps->frame_mbs_only_flag && !sps->direct_8x8_inference_flag){
+        av_log(h->s.avctx, AV_LOG_ERROR, "This stream was generated by a broken encoder, invalid 8x8 inference\n");
+        goto fail;
+    }
 
 #ifndef ALLOW_INTERLACE
     if(sps->mb_aff)