Update app.py

app.py

@@ -1,5 +1,6 @@
 import os
 import html
+import shutil
 import subprocess
 import tempfile
 from typing import Optional
@@ -10,7 +11,7 @@ import gradio as gr
 DESCRIPTION = """
 Mimic 3 TTS on Hugging Face Spaces (Gradio)
 
-- Uses the Mimic 3 CLI under-the-hood and returns a WAV file.
+- Uses the Mimic 3 CLI under-the-hood and returns MP3 audio (falls back to WAV if conversion fails).
 - Leave the Voice Key blank to use the default voice, or provide a specific key (e.g., `en_US/cmu-arctic_low`).
 - You can optionally wrap the input in SSML for rate/pitch by toggling the advanced options.
 
@@ -56,11 +57,33 @@ def synthesize(text: str, voice_key: str, use_ssml: bool, rate: str, pitch: str)
             err = proc.stderr.decode(errors="ignore")
             raise gr.Error(f"Mimic 3 failed (code {proc.returncode}).\n\n{err}")
 
-        # Write the WAV bytes to a temp file for Gradio
+        # Write the WAV bytes to a temp file
         with tempfile.NamedTemporaryFile(delete=False, suffix=".wav") as tmp:
             tmp.write(proc.stdout)
-            tmp_path = tmp.name
-        return tmp_path
+            wav_path = tmp.name
+
+        ffmpeg_path = shutil.which("ffmpeg")
+        if not ffmpeg_path:
+            return wav_path
+
+        mp3_fd, mp3_path = tempfile.mkstemp(suffix=".mp3")
+        os.close(mp3_fd)
+
+        convert = subprocess.run(
+            [ffmpeg_path, "-y", "-i", wav_path, "-codec:a", "libmp3lame", "-qscale:a", "4", mp3_path],
+            stdout=subprocess.PIPE,
+            stderr=subprocess.PIPE,
+            check=False,
+        )
+
+        if convert.returncode == 0 and os.path.exists(mp3_path):
+            os.remove(wav_path)
+            return mp3_path
+
+        # Conversion failed; clean up mp3 placeholder and return WAV instead
+        if os.path.exists(mp3_path):
+            os.remove(mp3_path)
+        return wav_path
     except FileNotFoundError:
         # The mimic3 CLI was not found; show a helpful error in the UI
         raise gr.Error("mimic3 CLI not found. Ensure package 'mycroft-mimic3-tts' is installed and available in PATH.")