Update app.py

app.py

@@ -23,8 +23,10 @@ async def add_watermark(file: UploadFile = File(...), watermark_text: str = "@Yo
         "ffmpeg", "-i", input_path,
         "-vf", f"drawtext=text='{watermark_text}':x=w-tw-20:y=h-th-20:fontsize=30:fontcolor=white@0.6",
         "-c:v", "libx264", "-profile:v", "main", "-pix_fmt", "yuv420p", 
-        "-preset", "ultrafast", "-crf", "23", "-c:a", "copy", 
-        "-movflags", "+faststart+frag_keyframe+empty_moov",
+        "-preset", "ultrafast", "-crf", "23", "-c:a", "copy",
+        "-flags", "+global_header", 
+        "-movflags", "+faststart+frag_keyframe+empty_moov+default_base_moof",
+        "-bsf:v", "h264_mp4toannexb",
         output_path
     ]