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PocketTTS emits 16-bit PCM WAV (16 kHz mono). WAV is natively supported on all browsers including iOS/macOS Safari, so the ffmpeg MP3 transcode is unnecessary for the streaming path. Using format=wav for PocketTTS voices eliminates the ffmpeg subprocess startup delay (~200–400 ms) and a pipeline stage, giving lower latency to first audio frame. Kokoro and CF AI continue using MP3 (they output MP3 natively or via the OpenAI-compatible endpoint). The runner (MinIO storage) is unaffected — it still stores MP3 for space efficiency. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>