pipecat/changelog/4249.changed.md

• Updated NvidiaTTSService:

  • Made api_key optional for local NIM deployments.
  • Voice, language, and quality can be updated without reconnecting the gRPC client; new values take effect on the next synthesis turn, not for the current turn's in-flight requests.
  • Replaced per-sentence synchronous synthesize_online calls with async queue-backed gRPC streaming.
  • Streaming now uses asyncio tasks with explicit gRPC cancellation on interruption and stale-response filtering when a stream is aborted or replaced.
  • Renamed Riva references to Nemotron Speech in docs and messages.
  • Disabled automatic TTS start frames at the service level (push_start_frame=False) and emit TTSStartedFrame when a stitched synthesis stream is started for a context.