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src/backends/piper.py

@@ -80,7 +80,13 @@ class PiperTTSBackend(TTSBackend):
             tmp_path = Path(tmp.name)
         try:
             with wave.open(str(tmp_path), "wb") as wav_file:
-                model.synthesize(text, wav_file)
+                # piper-tts >= 1.3 renames the WAV writer to ``synthesize_wav``;
+                # the old ``synthesize(text, wav_file)`` no longer sets the WAV
+                # header (raising "# channels not specified"). Support both.
+                if hasattr(model, "synthesize_wav"):
+                    model.synthesize_wav(text, wav_file)
+                else:
+                    model.synthesize(text, wav_file)
             audio, src_rate = read_wav_file(tmp_path)
         finally:
             tmp_path.unlink(missing_ok=True)