diff --git a/libavcodec/mpegvideo_xvmc.c b/libavcodec/mpegvideo_xvmc.c
index 7fd4244035..3c24ae7282 100644
--- a/libavcodec/mpegvideo_xvmc.c
+++ b/libavcodec/mpegvideo_xvmc.c
@@ -290,14 +290,13 @@ void ff_xvmc_decode_mb(MpegEncContext *s)
     }
     render->filled_mv_blocks_num++;
 
+    assert(render->filled_mv_blocks_num     <= render->total_number_of_mv_blocks);
     assert(render->next_free_data_block_num <= render->total_number_of_data_blocks);
-    /* The above condition should not be able to fail as long as this function
+    /* The above conditions should not be able to fail as long as this function
      * is used and the following 'if ()' automatically calls a callback to free
      * blocks. */
 
 
     if (render->filled_mv_blocks_num >= render->total_number_of_mv_blocks)
         ff_draw_horiz_band(s, 0, 0);
-    else
-        av_log(s->avctx, AV_LOG_ERROR, "Not all blocks have been processed.\n");
 }