diff --git a/transcoder/transcode_dvd.py b/transcoder/transcode_dvd.py
index 95226f2..d603198 100755
--- a/transcoder/transcode_dvd.py
+++ b/transcoder/transcode_dvd.py
@@ -136,11 +136,13 @@ def list_ripped_dvds(dvd_type):
         exit(1)
 
 
-def is_dvd_files_not_locked(dvd):
-    return not os.path.exists(dvd + ".lock") and not os.path.exists(dvd + ".err.log")
+def is_dvd_files_not_locked(dvd: Dvd):
+    return not os.path.exists(dvd.dvd_path + ".lock") and not os.path.exists(
+        dvd.dvd_path + ".err.log"
+    )
 
 
-def transcode_ripped_dvd(dvd):
+def transcode_ripped_dvd(dvd: Dvd):
     if dvd.is_movie():
         return transcode_movie(dvd)
     else:
@@ -206,7 +208,7 @@ def transcode_series(dvd: Dvd):
                 dvd.transcode_command_args_without_title_number(output_file)
                 + [
                     "--title",
-                    title_number,
+                    str(title_number),
                     "--min-duration",
                     str(MIN_EPISODES_DURATION_SECONDS),
                 ],
@@ -277,12 +279,19 @@ def write_to_logfile(dvd: Dvd, tag):
         file.write(log_line + "\n")
 
 
-def delete_transcoding_logfile(dvd):
-    os.remove(dvd + ".log")
+def delete_transcoding_logfile(dvd: Dvd):
+    os.remove(dvd.log_file)
 
 
-def rename_transcoding_logfile_as_error_log(dvd):
-    shutil.move(dvd + ".log", dvd + ".err.log")
+def rename_transcoding_logfile_as_error_log(dvd: Dvd):
+    shutil.move(dvd.log_file, dvd.err_log_file)
+
+
+def delete_old_transcoding_logfile_if_exists(dvd: Dvd):
+    try:
+        os.remove(dvd.log_file)
+    except FileNotFoundError:
+        pass
 
 
 def delete_original_video_files(folder):