diff --git a/inference_video_parallel.py b/inference_video_parallel.py
index 44578c9..00cdeaa 100644
--- a/inference_video_parallel.py
+++ b/inference_video_parallel.py
@@ -81,7 +81,7 @@ def clear_buffer(user_args, buffer):
     for i in buffer:
         if user_args.png:
             cv2.imwrite('output/{:0>7d}.png'.format(cnt), i)
-            cnt += i
+            cnt += 1
         else:
             vid_out.write(i)