Update app.py

app.py

@@ -108,7 +108,7 @@ def blur_video(input_path: str) -> str:
     cmd = [
         "ffmpeg", "-y", "-i", input_path,
         "-filter_complex", filter_graph,
-        "-c:v", "libx264", "-preset", "fast", "-crf", "23",
+        "-c:v", "libx264", "-preset", "veryfast", "-crf", "23",
         "-c:a", "copy", output
     ]
     log("Blurring video")