diff --git a/lib/src/WriterManager.cpp b/lib/src/WriterManager.cpp
index c6fbe20..3096734 100644
--- a/lib/src/WriterManager.cpp
+++ b/lib/src/WriterManager.cpp
@@ -48,8 +48,8 @@ void writer_utils::create_destination_folder(const string& output_file)
     }
 }
 
-WriterManager::WriterManager(const unordered_map<string, DATA_TYPE>& parameters_type):
-        parameters_type(parameters_type), logs(10), 
+WriterManager::WriterManager():
+        logs(10), 
         writing_flag(false), running_flag(true), 
         n_frames_to_receive(0), n_frames_to_write(0)
 {
@@ -98,7 +98,9 @@ unordered_map<string, boost::any> WriterManager::get_parameters()
     return parameters;
 }
 
-void WriterManager::start(const unordered_map<string, boost::any>& new_parameters)
+void WriterManager::start(const string output_file,
+                          const int n_frames, 
+                          const int user_id)
 {
 
     #ifdef DEBUG_OUTPUT
diff --git a/lib/src/WriterManager.hpp b/lib/src/WriterManager.hpp
index 29a8edd..7d35ab2 100644
--- a/lib/src/WriterManager.hpp
+++ b/lib/src/WriterManager.hpp
@@ -19,6 +19,7 @@ namespace writer_utils {
 struct WriterManagerLog
 {
     std::string filename;
+    std::string status;
 
     uint64_t n_requested_frames;
     uint64_t n_received_frames;
@@ -29,7 +30,6 @@ struct WriterManagerLog
 class WriterManager
 {
     // Initialize in constructor.
-    const std::unordered_map<std::string, DATA_TYPE>& parameters_type;
     const std::deque<WriterManagerLog> logs;
 
     std::atomic<bool> writing_flag;
@@ -39,11 +39,12 @@ class WriterManager
     std::atomic<int64_t> n_frames_to_write;
 
     public:
-        WriterManager(const std::unordered_map<std::string, DATA_TYPE>& parameters_type);
+        WriterManager();
         virtual ~WriterManager();
 
-        void start(const std::unordered_map<std::string, boost::any>& new_parameters);
+        void start(std::string output_file, int n_frames, int user_id);
         void stop();
+
         std::string get_status();
         std::unordered_map<std::string, uint64_t> get_statistics() const;