diff --git a/jf-live-writer/include/WriterStats.hpp b/jf-live-writer/include/WriterStats.hpp
index 775a46f..4d70e25 100644
--- a/jf-live-writer/include/WriterStats.hpp
+++ b/jf-live-writer/include/WriterStats.hpp
@@ -1,6 +1,7 @@
 #include <cstddef>
 #include <formats.hpp>
 #include <chrono>
+#include "broker_format.hpp"
 
 #ifndef SF_DAQ_BUFFER_FRAMESTATS_HPP
 #define SF_DAQ_BUFFER_FRAMESTATS_HPP
@@ -9,9 +10,12 @@
 class WriterStats {
     const std::string detector_name_;
     const size_t stats_modulo_;
-    const size_t image_n_bytes_;
+
+    uint32_t image_n_bytes_;
 
     int image_counter_;
+    uint64_t total_bytes_;
+
     uint32_t total_buffer_write_us_;
     uint32_t max_buffer_write_us_;
     std::chrono::time_point<std::chrono::steady_clock> stats_interval_start_;
@@ -22,8 +26,8 @@ class WriterStats {
 public:
     WriterStats(
             const std::string &detector_name,
-            const size_t stats_modulo,
-            const size_t image_n_bytes);
+            const size_t stats_modulo);
+    void setup_run(const StoreStream& meta);
     void start_image_write();
     void end_image_write();
 };
diff --git a/jf-live-writer/src/WriterStats.cpp b/jf-live-writer/src/WriterStats.cpp
index 51a0922..f6db5cd 100644
--- a/jf-live-writer/src/WriterStats.cpp
+++ b/jf-live-writer/src/WriterStats.cpp
@@ -6,11 +6,9 @@ using namespace chrono;
 
 WriterStats::WriterStats(
         const string& detector_name,
-        const size_t stats_modulo,
-        const size_t image_n_bytes) :
+        const size_t stats_modulo) :
             detector_name_(detector_name),
             stats_modulo_(stats_modulo),
-            image_n_bytes_(image_n_bytes)
 {
    reset_counters();
 }
@@ -20,6 +18,7 @@ void WriterStats::reset_counters()
     image_counter_ = 0;
     total_buffer_write_us_ = 0;
     max_buffer_write_us_ = 0;
+    total_bytes_ = 0;
 }
 
 void WriterStats::start_image_write()
@@ -27,9 +26,17 @@ void WriterStats::start_image_write()
     stats_interval_start_ = steady_clock::now();
 }
 
+void WriterStats::setup_run(const StoreStream& meta)
+{
+    image_n_bytes_ = (meta.image_y_size *
+                      meta.image_x_size *
+                      meta.bits_per_pixel) / 8;
+}
+
 void WriterStats::end_image_write()
 {
     image_counter_++;
+    total_bytes_ += image_n_bytes_;
 
     uint32_t write_us_duration = duration_cast<microseconds>(
             steady_clock::now()-stats_interval_start_).count();
diff --git a/jf-live-writer/src/main.cpp b/jf-live-writer/src/main.cpp
index 4d77d29..f379356 100644
--- a/jf-live-writer/src/main.cpp
+++ b/jf-live-writer/src/main.cpp
@@ -18,17 +18,14 @@ int main (int argc, char *argv[])
 {
     if (argc != 3) {
         cout << endl;
-        cout << "Usage: jf_live_writer [detector_json_filename]"
-                " [bits_per_pixel]" << endl;
+        cout << "Usage: jf_live_writer [detector_json_filename]" << endl;
         cout << "\tdetector_json_filename: detector config file path." << endl;
-        cout << "\tbits_per_pixel: Number of bits in each pixel." << endl;
         cout << endl;
 
         exit(-1);
     }
 
     auto const config = BufferUtils::read_json_config(string(argv[1]));
-    auto const bits_per_pixel = atoi(argv[2]);
 
     MPI_Init(NULL, NULL);
 
@@ -45,11 +42,8 @@ int main (int argc, char *argv[])
 
     RamBuffer ram_buffer(config.detector_name, config.n_modules);
 
-    const uint64_t image_n_bytes =
-            config.image_y_size * config.image_x_size * bits_per_pixel;
-
     JFH5Writer writer(config);
-    WriterStats stats(config.detector_name, STATS_MODULO, image_n_bytes);
+    WriterStats stats(config.detector_name, STATS_MODULO);
 
     StoreStream meta = {};
     while (true) {
@@ -61,6 +55,9 @@ int main (int argc, char *argv[])
                             meta.image_y_size,
                             meta.image_x_size,
                             meta.bits_per_pixel);
+
+            stats.setup_run(meta);
+
             continue;
         }