Update app.py

app.py

@@ -338,12 +338,16 @@ async def concat_story_audio(story: StoryCreationDTO, base_output: str, final_pa
                 bg_audio = AudioSegment.from_file(bg_file_wav)
 
                 # Adjust volume
-                bg_audio = bg_audio - (1 - scene.bgMusic.volume) * 30  # approximate
+                bg_audio = bg_audio - (1 - scene.bgMusic.volume) * 50  # approximate
                 # Loop if shorter than scene
                 if len(bg_audio) < len(scene_audio):
                     loops = (len(scene_audio) // len(bg_audio)) + 1
                     bg_audio = bg_audio * loops
                 bg_audio = bg_audio[:len(scene_audio)]  # trim to match scene
+                
+                # fade out gradually (2 seconds)
+                bg_audio = bg_audio.fade_out(2000)
+                
                 scene_audio = scene_audio.overlay(bg_audio)
                 # os.remove(bg_file)
 
@@ -352,7 +356,7 @@ async def concat_story_audio(story: StoryCreationDTO, base_output: str, final_pa
             chapter_audio += scene_audio
 
         # Add 3 seconds of silence between chapters
-        chapter_audio += AudioSegment.silent(duration=3000)
+        chapter_audio += AudioSegment.silent(duration=2000)
         chapters_audio += chapter_audio
 
     # Export final story