add printf

src/nodes/stream/streamNode.cpp

@@ -30,7 +30,7 @@ void StreamNode::work()
         for (auto& output_buffer : output_buffers_)
         {
             output_buffer.second->push(metaData);
-            printf("%d\n", output_buffer.second->size());
+            printf("Push data to %s\n", output_buffer.first.c_str());
         }
     }
 }