diff --git a/lerobot/common/datasets/video_utils.py b/lerobot/common/datasets/video_utils.py
index 82beb876..a0dd2544 100644
--- a/lerobot/common/datasets/video_utils.py
+++ b/lerobot/common/datasets/video_utils.py
@@ -264,7 +264,7 @@ def encode_video_frames(
         [
             ("-f", "image2"),
             ("-r", str(fps)),
-            ("-i", str(imgs_dir / "frame_%06d.png")),
+            ("-i", str(imgs_dir / "frame-%06d.png")),
             ("-vcodec", vcodec),
             ("-pix_fmt", pix_fmt),
         ]