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Ebook to audiobook converter using MiniMax and FFmpeg

Jay Emp0Jay Emp0
634 views
2/3/2026
AIGPT-4oPrompt EngineeringOpenAIText Generation
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Ebook to Audiobook Converter

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▶️ Watch Full Demo Video

What It Does

Turn any PDF ebook into a professional audiobook automatically. Upload a PDF, get an MP3 audiobook in your Google Drive. Perfect for listening to books, research papers, or documents on the go.

Example: Input PDF → Output Audiobook

Key Features

  • Upload PDF via web form → Get MP3 audiobook in Google Drive
  • Natural-sounding AI voices (MiniMax Speech-02-HD)
  • Automatic text extraction, chunking, and audio merging
  • Customizable voice, speed, and emotion settings
  • Processes long books in batches with smart rate limiting

Perfect For

  • Students: Turn textbooks into study audiobooks
  • Professionals: Listen to reports and documents while commuting
  • Content Creators: Repurpose written content as audio
  • Accessibility: Make content accessible to visually impaired users

Requirements

| Component | Details | |-----------|---------| | n8n | Self-hosted ONLY (cannot run on n8n Cloud) | | FFmpeg | Must be installed in your n8n environment | | Replicate API | For MiniMax TTS (Sign up here) | | Google Drive | OAuth2 credentials + "Audiobook" folder |

⚠️ Important: This workflow does NOT work on n8n Cloud because FFmpeg installation is required.

Quick Setup

1. Install FFmpeg

Docker users:

docker exec -it <n8n-container-name> /bin/bash
apt-get update && apt-get install -y ffmpeg

Native installation:

sudo apt-get install ffmpeg  # Linux
brew install ffmpeg          # macOS

2. Get API Keys

  • Replicate: Sign up at replicate.com and copy your API token
  • Google Drive: Set up OAuth2 in n8n and create an "Audiobook" folder in Drive

3. Import & Configure

  1. Import n8n.json into your n8n instance
  2. Replace the Replicate API token in the "MINIMAX TTS" node
  3. Configure Google Drive credentials and select your "Audiobook" folder
  4. Activate the workflow

Cost Estimate

| Component | Cost | |-----------|------| | MiniMax TTS API | ~$0.15 per 1000 characters (~$3-5 for average book) | | Google Drive Storage | Free (up to 15GB) | | Processing Time | ~1-2 minutes per 10 pages |

How It Works

Workflow Diagram

PDF Upload → Extract Text → Split into Chunks → Convert to Speech (batches of 5)
→ Merge Audio Files (FFmpeg) → Upload to Google Drive

The workflow uses four main modules:

  1. Extraction: PDF text extraction and intelligent chunking
  2. Conversion: MiniMax TTS processes text in batches
  3. Merging: FFmpeg combines all audio files seamlessly
  4. Upload: Final audiobook saved to Google Drive

Voice Settings (Customizable)

{
  "voice_id": "Friendly_Person",
  "emotion": "happy",
  "speed": 1,
  "pitch": 0
}

Available emotions: happy, neutral, sad, angry, excited

Limitations

  • ⚠️ Self-hosted n8n ONLY (not compatible with n8n Cloud)
  • PDF files only (not EPUB, MOBI, or scanned images)
  • Large books (500+ pages) take longer to process
  • Requires FFmpeg installation (see setup above)

Troubleshooting

FFmpeg not found?

  • Docker: Run docker exec -it <container> /bin/bash then apt-get install ffmpeg
  • Native: Run sudo apt-get install ffmpeg (Linux) or brew install ffmpeg (macOS)

Rate limit errors?

  • Increase wait time in the "WAITS FOR 5 SECONDS" node to 10-15 seconds

Google Drive upload fails?

  • Make sure you created the "Audiobook" folder in your Google Drive
  • Reconfigure OAuth2 credentials in n8n

Created by emp0 | More workflows: n8n Gallery

n8n Ebook to Audiobook Converter using Minimax and FFmpeg

This n8n workflow automates the process of converting ebook files into audiobooks using a combination of AI for text-to-speech and FFmpeg for audio processing. It leverages Minimax for generating speech from text and FFmpeg for handling the audio file creation and merging.

What it does

This workflow is designed to simplify the creation of audiobooks from text-based ebook files. Here's a step-by-step breakdown of its functionality:

  1. Trigger on Form Submission: The workflow starts when a form is submitted, likely providing details about the ebook to be converted.
  2. Read Ebook File from Disk: It reads the specified ebook file (e.g., EPUB, TXT) from the local disk where n8n is running.
  3. Extract Text from Ebook: The content of the ebook file is extracted into raw text.
  4. Loop Over Text Chunks: The extracted text is split into smaller chunks (batches) to be processed individually. This is crucial for handling large ebooks and API rate limits.
  5. Generate Audio with Minimax (HTTP Request): For each text chunk, an HTTP request is made to the Minimax API to convert the text into speech. This step generates an audio segment.
  6. Save Audio Segment to Disk: The generated audio segment from Minimax is saved as a temporary file on the local disk.
  7. Wait (Optional Delay): An optional delay is introduced between processing chunks, likely to manage API rate limits or system load.
  8. Execute FFmpeg Command: After all audio segments are generated and saved, an Execute Command node runs FFmpeg to merge all the individual audio segments into a single audiobook file.
  9. Upload to Google Drive: The final merged audiobook file is then uploaded to a specified Google Drive folder for storage and easy access.

Prerequisites/Requirements

To use this workflow, you will need:

  • n8n Instance: A running n8n instance with access to the local file system.
  • Minimax API Key: An API key for the Minimax text-to-speech service. This will be configured in the HTTP Request node.
  • FFmpeg Installed: FFmpeg must be installed and accessible from the command line on the server hosting your n8n instance.
  • Google Drive Account: A Google Drive account and credentials configured in n8n for uploading the final audiobook.
  • Ebook Files: Ebook files (e.g., .txt, .epub) that you wish to convert.

Setup/Usage

  1. Import the Workflow: Import the provided JSON into your n8n instance.
  2. Configure Credentials:
    • Set up your Google Drive credentials in n8n.
    • Configure the HTTP Request node with your Minimax API key and the appropriate endpoint for text-to-speech conversion.
  3. Adjust Node Settings:
    • On form submission: Customize the form fields if needed to accept ebook file paths or other relevant information.
    • Read/Write Files from Disk: Ensure the paths for reading ebook files and saving temporary audio segments are correctly configured for your n8n server's file system.
    • Extract from File: Verify the settings for extracting text from your specific ebook file types.
    • Loop Over Items (Split in Batches): Adjust the batch size if necessary based on your Minimax API limits and desired processing speed.
    • Execute Command: Update the FFmpeg command to correctly merge the audio files and specify the output format (e.g., MP3). Ensure the input file pattern matches how your temporary audio segments are named.
    • Google Drive: Specify the target folder in Google Drive where you want the audiobooks to be uploaded.
  4. Activate the Workflow: Once configured, activate the workflow. You can then trigger it by submitting the n8n form.

This workflow provides a powerful and flexible way to automate audiobook creation, bridging the gap between digital text and spoken word.

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