@@ -276,7 +276,7 @@ def create_videos(self):
             self.root.writer.write("Labeled videos created.")
         else:
             failed_videos = [video for success, video in zip(videos_created, videos, strict=False) if not success]
-            failed_videos_str = ", ".join(failed_videos)
+            failed_videos_str = ", ".join(str(video) for video in failed_videos)
             self.root.writer.write(f"Failed to create videos from {failed_videos_str}.")
 
         if self.plot_trajectories.isChecked():
 
@@ -79,7 +79,8 @@ def convertcsv2h5(config: str | Path, userfeedback=True, scorer=None):
                 data = pd.read_csv(fn, index_col=index_col, header=header)
                 data.columns = data.columns.set_levels([scorer], level="scorer")
                 guarantee_multiindex_rows(data)
-                data.to_hdf(fn.replace(".csv", ".h5"), key="df_with_missing", mode="w")
+                h5_path = fn.with_suffix(".h5")
+                data.to_hdf(h5_path, key="df_with_missing", mode="w")
                 data.to_csv(fn)
         except FileNotFoundError:
             print("Attention:", folder, "does not appear to have labeled data!")
 
@@ -317,7 +317,7 @@ def plot_trajectories(
 
     if len(failures) > 0:
         # Some videos were not evaluated.
-        failed_videos = ",".join(failures)
+        failed_videos = ",".join(str(video) for video in failures)
         if len(multianimal_errors) > 0:
             verbose_error = ": " + " ".join(multianimal_errors)
         else: