no audio, no problem

app.py

@@ -104,8 +104,9 @@ def extract_audio_from_video_ffmpeg(video_path, output_wav_path, sample_rate=Non
     
     try:
         subprocess.run(cmd, check=True, capture_output=True, text=True)
+        return True
     except subprocess.CalledProcessError as e:
-        raise RuntimeError(f"ffmpeg failed ({e.returncode}): {e.stderr.strip()}")
+        return False
 
     
 def combine_video_and_audio_ffmpeg(video_path, audio_path, output_video_path):
@@ -318,7 +319,11 @@ def animate_scene(input_video, edited_frame, rc_str, session_id = None, progress
 
     input_audio_path = os.path.join(output_dir, 'input_audio.wav')
     
-    extract_audio_from_video_ffmpeg(input_video, input_audio_path)
+    audio_extracted = extract_audio_from_video_ffmpeg(input_video, input_audio_path)
+
+    edited_frame_png = os.path.join(output_dir, 'edited_frame.png')
+    edited_frame_img = Image.open(edited_frame)
+    edited_frame_img.save(edited_frame_png)
 
     output_video_path = _animate(input_video, edited_frame, rc_bool, session_id, progress)
 
@@ -336,8 +341,10 @@ def animate_scene(input_video, edited_frame, rc_str, session_id = None, progress
         bg_video = os.path.join(preprocess_dir, 'src_pose.mp4') 
         face_video = os.path.join(preprocess_dir, 'src_pose.mp4') 
 
-    combine_video_and_audio_ffmpeg(output_video_path, input_audio_path, final_video_path)
-
+    if audio_extracted:
+        combine_video_and_audio_ffmpeg(output_video_path, input_audio_path, final_video_path)
+    else:
+        final_video_path = output_video_path
     return final_video_path, pose_video, bg_video, mask_video, face_video
 
 css = """