之前的 mix_audio() 只回傳了 text 和 file，沒有 audio 的值，導致錯誤

app.py

@@ -30,7 +30,7 @@ def mix_audio(podcast_file, bgm_file, bgm_volume, loop, fade_in_out, fade_durati
     output_file = "mixed_podcast.mp3"
     mixed.export(output_file, format="mp3")
 
-    return "混音完成！點擊下載", output_file
+    return "混音完成！點擊下載", output_file, output_file  # 第三個值是給 gr.Audio 用的
 
 # 建立 Gradio 介面
 with gr.Blocks() as app:
@@ -51,6 +51,8 @@ with gr.Blocks() as app:
             audio_output = gr.Audio(label="🎧 預覽混音結果", format="mp3", interactive=False, autoplay=False)
             download_output = gr.File(label="⬇️ 下載混音 MP3")
 
+
+
     process_button.click(
         fn=mix_audio,
         inputs=[podcast_input, bgm_input, bgm_volume, loop_option, fade_option, fade_duration],