Update app.py

app.py

@@ -55,8 +55,8 @@ def interpolate_image(img_a_path: str, img_b_path: str) -> Tuple[str, str]:
         subprocess.run([
             "ffmpeg", "-y", "-r", "14", "-f",
             "-i", f"{TARGET_DIR}img%d.png",
-            str(palettegen=stats_mode=single),
-            str(palette.png)
+            "palettegen=stats_mode=single",
+            palette_path
         ], check=True)
 
         return interpolated_image, interpolated_path