Update app.py

app.py

@@ -69,7 +69,7 @@ def infer_video_depth(
     max_len: int = -1,
     target_fps: int = -1,
     max_res: int = 1280,
-    grayscale: bool = False,
+    grayscale: bool = True,
     output_dir: str = './outputs',
     input_size: int = 518
 ):