diff --git a/app/server.py b/app/server.py
index 8f009310..3877fae7 100644
--- a/app/server.py
+++ b/app/server.py
@@ -134,7 +134,7 @@ def _inference_video(model_info: ModelInfo, video_filepath: FilePath) -> FilePat
     visualizer = VISUALIZERS.build(model.cfg.visualizer)
     visualizer.dataset_meta = model.dataset_meta
     video_reader = mmcv.VideoReader(str(video_filepath))
-    fourcc = cv2.VideoWriter_fourcc(*"mp4v")
+    fourcc = cv2.VideoWriter_fourcc(*"H264")
     out_filepath = video_filepath.parent / (f"inferenced_{video_filepath.name}")
     video_writer = cv2.VideoWriter(
         str(out_filepath),