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fix(tts): use .ogg extension for Telegram auto-TTS voice replies #20878

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fix(tts): use .ogg extension for Telegram auto-TTS voice replies #20878

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11 changes: 8 additions & 3 deletions gateway/run.py
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Original file line number Diff line number Diff line change
Expand Up @@ -8682,11 +8682,16 @@ async def _send_voice_reply(self, event: MessageEvent, text: str) -> None:
if not tts_text:
return

# Use .mp3 extension so edge-tts conversion to opus works correctly.
# The TTS tool may convert to .ogg — use file_path from result.
# Use .ogg extension for Telegram (native voice bubble format)
# so providers like ElevenLabs/OpenAI output opus natively.
# For other platforms, .mp3 is fine. The TTS tool's opus
# conversion fallback handles Edge TTS and other mp3-only providers.
from gateway.session_context import get_session_env
_platform = get_session_env("HERMES_SESSION_PLATFORM", "").lower()
_tts_ext = "ogg" if _platform == "telegram" else "mp3"
audio_path = os.path.join(
tempfile.gettempdir(), "hermes_voice",
f"tts_reply_{_uuid.uuid4().hex[:12]}.mp3",
f"tts_reply_{_uuid.uuid4().hex[:12]}.{_tts_ext}",
)
os.makedirs(os.path.dirname(audio_path), exist_ok=True)

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