Update app.py

app.py

@@ -286,7 +286,7 @@ def add_transcript_voiceover(video_path, translated_json, output_path, add_voice
     
     if add_voiceover and audio_segments:
         audio_segments.sort(key=lambda segment: segment.start)
-        final_audio = concatenate_audioclips(audio_segments)
+        final_audio = CompositeAudioClip(audio_segments)  # Critical fix
         final_audio = final_audio.with_duration(video.duration)
 
         final_video = final_video.with_audio(final_audio)