diff --git a/mpp/codec/mpp_buf_slot.cpp b/mpp/codec/mpp_buf_slot.cpp
index 14052912..5715cf34 100644
--- a/mpp/codec/mpp_buf_slot.cpp
+++ b/mpp/codec/mpp_buf_slot.cpp
@@ -773,9 +773,14 @@ MPP_RET mpp_buf_slot_set_prop(MppBufSlots slots, RK_S32 index, SlotPropType type
          */
         generate_info_set(impl, frame);
         if (mpp_frame_info_cmp(impl->info, impl->info_set)) {
+            MppFrameImpl *old = (MppFrameImpl *)impl->info;
             // info change found here
             impl->info_changed = 1;
             mpp_log("info change found\n");
+            mpp_log("old width %4d height %4d stride hor %4d ver %4d\n",
+                    old->width, old->height, old->hor_stride, old->ver_stride);
+            mpp_log("new width %4d height %4d stride hor %4d ver %4d\n",
+                    dst->width, dst->height, dst->hor_stride, dst->ver_stride);
         }
     } break;
     case SLOT_BUFFER: {
diff --git a/mpp/codec/mpp_dec.cpp b/mpp/codec/mpp_dec.cpp
index 169e2fb1..6aa61973 100644
--- a/mpp/codec/mpp_dec.cpp
+++ b/mpp/codec/mpp_dec.cpp
@@ -182,10 +182,12 @@ void *mpp_dec_parser_thread(void *data)
             parser->wait();
         parser->unlock();
 
-        wait.dec_pic_buf = (mpp_buffer_group_unused(mpp->mFrameGroup) < 1);
+        if (mpp->mFrameGroup) {
+            wait.dec_pic_buf = (mpp_buffer_group_unused(mpp->mFrameGroup) < 1);
+            if (wait.dec_pic_buf)
+                continue;
+        }
 
-        if(wait.dec_pic_buf)
-            continue;
         /*
          * 1. get task handle from hal for parsing one frame
          */