diff --git a/demo/video_demo.py b/demo/video_demo.py
index 6fc36319ae8..f72d617695c 100644
--- a/demo/video_demo.py
+++ b/demo/video_demo.py
@@ -58,7 +58,7 @@ def main():
             args.out, fourcc, video_reader.fps,
             (video_reader.width, video_reader.height))
 
-    for frame in track_iter_progress(video_reader):
+    for frame in track_iter_progress((video_reader, len(video_reader))):
         result = inference_detector(model, frame, test_pipeline=test_pipeline)
         visualizer.add_datasample(
             name='video',