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evo-tts-audiobook-synth

Converts text chunks into speech audio using cascading fallback (OpenAI TTS -> ElevenLabs -> edge-tts -> gTTS). Handles API auth, rate limiting, MP3 chunk generation, and audio concatenation into a single MP3 file.

tasks-evolved/pg-essay-to-audiobook/environment/skills/evo-tts-audiobook-synth/SKILL.md

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Sep 10, 2026
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Apache-2.0

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# evo-tts-audiobook-synth

Converts text to speech with cascading API fallback and audio concatenation.

## Key Functions

- `synthesize_with_openai(text, output_path)` - Uses OpenAI TTS API (tts-1, 4096 char limit)
- `synthesize_with_elevenlabs(text, output_path)` - Uses ElevenLabs API (client.text_to_speech.convert)
- `synthesize_with_local_tts(text, output_path)` - Uses edge-tts (async) or gTTS as fallback
- `synthesize_text_to_audio(text, output_path)` - Tries OpenAI -> ElevenLabs -> local, returns bytes
- `concatenate_audio_chunks(chunk_files, output_file)` - Concatenates MP3 files using pydub/ffmpeg

## Usage
```python