Update app.py

app.py

@@ -70,21 +70,38 @@ def download_youtube_audio(youtube_url):
 
 def convert_to_wav(input_path):
     """
-    Convert any audio/video to 16kHz mono WAV using ffmpeg CLI for reliability.
+    Convert any audio/video to 16kHz mono WAV using ffmpeg.
+    Always creates a new temp wav file (never overwrites input).
     Returns path to wav file.
     """
-    p = Path(input_path)
-    out_wav = str(p.with_suffix(".wav"))
+    import tempfile
+    from pydub import AudioSegment
+
     try:
-        subprocess.run(
+        tmp_wav = tempfile.NamedTemporaryFile(suffix=".wav", delete=False, prefix="conv_")
+        tmp_wav.close()
+        out_wav = tmp_wav.name
+
+        # Use ffmpeg CLI
+        result = subprocess.run(
             ["ffmpeg", "-y", "-i", str(input_path), "-ar", "16000", "-ac", "1", out_wav],
-            check=True,
-            stdout=subprocess.DEVNULL,
-            stderr=subprocess.DEVNULL,
+            stdout=subprocess.PIPE,
+            stderr=subprocess.PIPE
         )
+
+        if result.returncode != 0 or not os.path.exists(out_wav):
+            print("⚠️ ffmpeg failed, trying pydub fallback...")
+            try:
+                audio = AudioSegment.from_file(input_path)
+                audio = audio.set_frame_rate(16000).set_channels(1)
+                audio.export(out_wav, format="wav")
+            except Exception as e:
+                raise RuntimeError(f"Both ffmpeg and pydub conversion failed: {e}")
+
         return out_wav
+
     except Exception as e:
-        raise RuntimeError(f"ffmpeg conversion failed: {e}")
+        raise RuntimeError(f"Conversion error: {e}")
 
 def split_audio_to_chunks(wav_path, max_ms=5*60*1000):
     """