suppress that ffmpeg warning

streamlit_av_queue.py

@@ -1,3 +1,4 @@
+import os
 from typing import List
 import av
 import asyncio
@@ -39,7 +40,16 @@ class StreamlitAVQueue:
             if len(video_output_frames) > 0:
                 self._video_output_frame = video_output_frames[-1]
             for i, frame in enumerate(frames):
+                
+                # supress the ffmpeg warning
+                saved_stderr_fd = os.dup(2)
+                stderr_fd = os.open(os.devnull, os.O_WRONLY)
+                os.dup2(stderr_fd, 2)
                 user_image = frame.to_ndarray(format="rgb24")
+                os.dup2(saved_stderr_fd, 2)
+                os.close(stderr_fd)
+                os.close(saved_stderr_fd)
+
                 if should_look:
                     shared_tensor_ref = ray.put(user_image)
                     await self.app_interface_actor.enqueue_video_input_frame.remote(shared_tensor_ref)