happytails.ai

Audio chapter splitter

Open Audio chapter splitter on Happytails.ai. This view has the same page content and links, with explicit tool capabilities. Read the processing notes before using a tool.

Tool capabilities

{
  "id": "audio-chapter-splitter",
  "category": "media-tools",
  "built": true,
  "requirements": "One recording up to 256 MiB and 10 minutes, at most 999 chapters and 100,000 characters of chapter list. WAV is read with every sample intact; other formats are decoded by your browser at 48 kHz. Everything is processed on your device and nothing is uploaded. Download: ZIP of WAV files, a JSON report and a CSV chapter list.",
  "implementation": {
    "fields": [
      {
        "key": "encoding",
        "label": "WAV sample format",
        "value": "match",
        "type": "select",
        "values": [
          "match",
          "pcm16",
          "pcm24",
          "float32"
        ],
        "labels": {
          "match": "Match source sample format"
        }
      }
    ],
    "registrationFamily": "audio-dsp-edit",
    "presentation": "metrics",
    "files": true,
    "accept": ".wav,.mp3,.m4a,.aac,.flac,.ogg,.oga,.opus,.webm,audio/*",
    "maxFileBytes": 268435456,
    "inputMaxLength": 100000,
    "inputErrorCode": "AUDIO_DSP_EDIT_TOO_LONG_CHAPTERS",
    "note": "Runs locally in your browser. Splits one recording up to 10 minutes into at most 999 chapters.",
    "experience": {
      "automatic": false,
      "single": false,
      "inputMaxLength": 100000,
      "inputMode": "text",
      "label": "Chapter list",
      "placeholder": "0 Intro",
      "help": "One chapter per line: a start time, an optional end time and a title. Up to 100,000 characters. Review the settings before running.",
      "helpParts": [
        "One chapter per line: a start time, an optional end time and a title.",
        "Up to 100,000 characters.",
        "Review the settings before running."
      ],
      "action": null
    },
    "mode": "explicit",
    "interactive": false
  },
  "execution": "Browser interface",
  "api": null,
  "browser_agent": {
    "supported": true,
    "name": "run_current_tool",
    "discovery": "WebMCP on the human page in a supporting browser",
    "verification": "See audit/API-AUDIT.md; availability is not verification"
  }
}

Page guide

Split one long recording into separate WAV files from your own list of chapter start times, with gaps and overlaps flagged.

How to use Audio chapter splitter
  1. Choose the recording to split.
  2. Paste one chapter per line: a start time, an optional end time and a title.
  3. Split the audio and check the report for gaps, overlaps or times past the end.
  4. Download the ZIP of chapter files and the CSV chapter list.

Useful next steps

Trim audioMerge audioAudio fade editor

Chapter list

Write one chapter per line, such as 0 Intro or 1:02:03.5 Part two. Times can be seconds, minutes and seconds or hours, minutes and seconds. An optional end time can follow the start, as in 0 1:30 Intro. CSV lines such as 0,90,Intro also work. Lines starting with # are ignored.

Checks

Start times must increase. A chapter without an end time runs to the next start, and the last one runs to the end of the audio. The report flags a gap when a chapter ends before the next one starts, an overlap when it ends after, and a leading gap when the first chapter does not start at 0. A chapter outside the audio stops the split.

Files

Each chapter becomes a WAV named with its number and title, stored uncompressed in a ZIP file. Cuts are made at the nearest sample, and the source format is kept when the sample format is set to match.