bugfix

src/nodes/track/trackNode.cpp

@@ -27,7 +27,7 @@ void TrackNode::handle_data(std::shared_ptr<meta::MetaData>& meta_data)
             }
         }
     }
-    std::vector<STrack> output_stracks = track_map_[input_buffer.first] ->update(objects);
+    std::vector<STrack> output_stracks = track_map_[meta_data->from] ->update(objects);
 
     for (const auto& track : output_stracks) {
         const std::vector<float>& tlwh = track.tlwh;