diff --git a/ffmpeg-split.py b/ffmpeg-split.py
index 6b8ae9e..e4f8b76 100644
--- a/ffmpeg-split.py
+++ b/ffmpeg-split.py
@@ -106,7 +106,8 @@ def split_by_seconds(filename, split_length, vcodec="copy", acodec="copy",
             split_start = split_length * n
 
         split_args += ["-ss", str(split_start), "-t", str(split_length),
-                       filebase + "-" + str(n) + "." + fileext]
+                       filebase + "-" + str(n+1) + "-of-" + \
+                        str(split_count) + "." + fileext]
         print "About to run: "+" ".join(split_cmd+split_args)
         subprocess.check_output(split_cmd+split_args)