{
  "title": "Voiceover timing",
  "human_url": "https://happytails.ai/en/speech-tools/voiceover-timing/",
  "agent_url": "https://happytails.ai/agents/en/speech-tools/voiceover-timing/",
  "language": "en",
  "markdown_url": "https://happytails.ai/en/speech-tools/voiceover-timing.md",
  "content": "Voiceover timing\nEstimate the speaking pace needed for a target duration.\nUseful next steps\nText to speech\nRead text aloud with a browser voice.\nPDF to audio\nRead selectable PDF text aloud using a local system voice.\nPronunciation player\nHear words and phrases with an available browser voice.\nHow to use Voiceover timing\nEnter your text in the input field.\nThe result updates as you type. Adjust the available settings if needed.\nReview the result, then use Copy result or a download link when available.\nWhat to expect\nEstimate the speaking pace needed for a target duration. Enter the script and target duration. The result is a timing estimate based on word count; this tool does not generate or edit audio.",
  "content_format": "text/plain",
  "visibility": "public",
  "links": [
    {
      "name": "Text to speech Read text aloud with a browser voice.",
      "url": "https://happytails.ai/en/speech-tools/text-to-speech/"
    },
    {
      "name": "PDF to audio Read selectable PDF text aloud using a local system voice.",
      "url": "https://happytails.ai/en/speech-tools/pdf-to-audio/"
    },
    {
      "name": "Pronunciation player Hear words and phrases with an available browser voice.",
      "url": "https://happytails.ai/en/speech-tools/pronunciation-player/"
    }
  ],
  "tool": {
    "id": "voiceover-timing",
    "category": "speech-tools",
    "built": true,
    "requirements": "Fit stock-voice narration to a target duration; report actual duration; let users shorten text and regenerate; avoid stretching speech into unintelligibility.",
    "implementation": {
      "fields": [
        {
          "key": "pace",
          "label": "Speaking words per minute",
          "value": 150,
          "type": "number"
        }
      ],
      "experience": {
        "automatic": true,
        "single": false,
        "label": "Your text",
        "placeholder": "Hello world!",
        "help": "Change the input or settings to update your result. Results update as you type. Up to 1,000,000 characters.",
        "action": null
      },
      "mode": "automatic",
      "interactive": false
    },
    "execution": "POST /api/v1/tools/voiceover-timing/run",
    "api": {
      "id": "voiceover-timing",
      "name": "Voiceover timing",
      "category": "speech-tools",
      "description": "Estimate the speaking pace needed for a target duration.",
      "notes": "",
      "human_path": "/en/speech-tools/voiceover-timing/",
      "method": "POST",
      "endpoint": "/api/v1/tools/voiceover-timing/run",
      "schema_url": "/api/v1/tools/voiceover-timing",
      "input_schema": {
        "type": "object",
        "additionalProperties": false,
        "properties": {
          "input": {
            "type": "string",
            "maxLength": 1000000,
            "default": "",
            "description": "Plain text input. File tools use files instead unless otherwise documented."
          },
          "options": {
            "type": "object",
            "additionalProperties": false,
            "properties": {
              "pace": {
                "type": "number",
                "description": "Speaking words per minute",
                "default": 150.0
              }
            }
          }
        }
      },
      "output_schema": {
        "type": "object",
        "required": [
          "tool",
          "result"
        ],
        "properties": {
          "tool": {
            "type": "string"
          },
          "result": {
            "type": "object",
            "required": [
              "text",
              "files"
            ],
            "properties": {
              "text": {
                "type": [
                  "string",
                  "null"
                ]
              },
              "data": {
                "description": "Parsed JSON when the textual result is JSON."
              },
              "name": {
                "type": "string"
              },
              "mime": {
                "type": "string"
              },
              "files": {
                "type": "array",
                "items": {
                  "type": "object",
                  "required": [
                    "name",
                    "mime",
                    "bytes",
                    "base64"
                  ],
                  "properties": {
                    "name": {
                      "type": "string"
                    },
                    "mime": {
                      "type": "string"
                    },
                    "bytes": {
                      "type": "integer"
                    },
                    "base64": {
                      "type": "string",
                      "contentEncoding": "base64"
                    }
                  }
                }
              }
            }
          }
        }
      },
      "processing": "Server; same transformation code as browser tools",
      "limits": {
        "request_bytes": 8388608,
        "input_characters": 1000000,
        "files_bytes": 5242880,
        "max_files": 0,
        "timeout_seconds": 12
      }
    },
    "agent_processing": "Server; same transformation code as browser tools",
    "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"
    }
  },
  "markdown": "# Voiceover timing\n\n- Human page: https://happytails.ai/en/speech-tools/voiceover-timing/\n- Markdown: https://happytails.ai/en/speech-tools/voiceover-timing.md\n- Structured JSON: https://happytails.ai/agents/en/speech-tools/voiceover-timing/index.json\n- Visibility: public\n\n## Tool capabilities\n\n| Property | Value |\n| --- | --- |\n| Tool ID | `voiceover-timing` |\n| Category | speech-tools |\n| Implementation | Registered implementation. Registration alone is not a production-quality guarantee. |\n| Browser execution | Automatic updates after valid input or file selection. |\n| Browser processing | Browser; see tool notes for network behavior. |\n| HTTP API | /api/v1/tools/voiceover-timing/run |\n| Browser-agent interface | run_current_tool |\n\n### Inputs and settings\n\nText input: Your text.\n\nExample or placeholder shown in the interface (not a validated fixture):\n\n```text\nHello world!\n```\n\nChange the input or settings to update your result. Results update as you type. Up to 1,000,000 characters.\n\n| Setting | Meaning | Control type | Default | Constraints |\n| --- | --- | --- | --- | --- |\n| `pace` | Speaking words per minute | number | 150 |  |\n\n### HTTP contract\n\nAPI calls process supplied data on the server. The website origin is `https://happytails.ai`. Server API hosting is not connected on the public website yet. Use your local server origin to test these requests.\n\n```http\nPOST https://happytails.ai/api/v1/tools/voiceover-timing/run\nContent-Type: application/json\n```\n\n[Detailed operation reference](https://happytails.ai/en/api/tools/voiceover-timing.md) · [Shared API guide](https://happytails.ai/en/api.md)\n\n#### Limits\n\n| Limit | Value |\n| --- | --- |\n| request_bytes | 8388608 |\n| input_characters | 1000000 |\n| files_bytes | 5242880 |\n| max_files | 0 |\n| timeout_seconds | 12 |\n\n#### Complete input schema\n\n```json\n{\n  \"type\": \"object\",\n  \"additionalProperties\": false,\n  \"properties\": {\n    \"input\": {\n      \"type\": \"string\",\n      \"maxLength\": 1000000,\n      \"default\": \"\",\n      \"description\": \"Plain text input. File tools use files instead unless otherwise documented.\"\n    },\n    \"options\": {\n      \"type\": \"object\",\n      \"additionalProperties\": false,\n      \"properties\": {\n        \"pace\": {\n          \"type\": \"number\",\n          \"description\": \"Speaking words per minute\",\n          \"default\": 150.0\n        }\n      }\n    }\n  }\n}\n```\n\n#### Complete output schema\n\n```json\n{\n  \"type\": \"object\",\n  \"required\": [\n    \"tool\",\n    \"result\"\n  ],\n  \"properties\": {\n    \"tool\": {\n      \"type\": \"string\"\n    },\n    \"result\": {\n      \"type\": \"object\",\n      \"required\": [\n        \"text\",\n        \"files\"\n      ],\n      \"properties\": {\n        \"text\": {\n          \"type\": [\n            \"string\",\n            \"null\"\n          ]\n        },\n        \"data\": {\n          \"description\": \"Parsed JSON when the textual result is JSON.\"\n        },\n        \"name\": {\n          \"type\": \"string\"\n        },\n        \"mime\": {\n          \"type\": \"string\"\n        },\n        \"files\": {\n          \"type\": \"array\",\n          \"items\": {\n            \"type\": \"object\",\n            \"required\": [\n              \"name\",\n              \"mime\",\n              \"bytes\",\n              \"base64\"\n            ],\n            \"properties\": {\n              \"name\": {\n                \"type\": \"string\"\n              },\n              \"mime\": {\n                \"type\": \"string\"\n              },\n              \"bytes\": {\n                \"type\": \"integer\"\n              },\n              \"base64\": {\n                \"type\": \"string\",\n                \"contentEncoding\": \"base64\"\n              }\n            }\n          }\n        }\n      }\n    }\n  }\n}\n```\n\n#### Error and retry handling\n\nFailures return a non-200 status and `error.code` plus `error.message`. Correct invalid input before retrying; retry server-busy responses with bounded backoff. Returned files contain Base64 data, not persistent download URLs. Decode and inspect the output before treating conversion as successful. See the shared API guide for the complete status and timeout rules.\n\n### Browser-agent workflow\n\n1. Open the human page in a browser that supports WebMCP.\n2. Discover the interface exposed by that page; use its actual schema.\n3. Select files on the page first when the tool requires files.\n4. Call `run_current_tool` with valid input and settings.\n5. Inspect the returned result or error and the displayed output. Retrieve files from the displayed download links.\n\nCalls do not automatically copy or download results. Browser permissions still apply. Interface availability alone is not proof of successful execution.\n\n### Planning specification\n\nFit stock-voice narration to a target duration; report actual duration; let users shorten text and regenerate; avoid stretching speech into unintelligibility.\n\nThis describes intended requirements. Use the implementation notes, interface schema and observed output to determine current support.\n\n### Complete machine-readable capability record\n\n```json\n{\n  \"id\": \"voiceover-timing\",\n  \"category\": \"speech-tools\",\n  \"built\": true,\n  \"requirements\": \"Fit stock-voice narration to a target duration; report actual duration; let users shorten text and regenerate; avoid stretching speech into unintelligibility.\",\n  \"implementation\": {\n    \"fields\": [\n      {\n        \"key\": \"pace\",\n        \"label\": \"Speaking words per minute\",\n        \"value\": 150,\n        \"type\": \"number\"\n      }\n    ],\n    \"experience\": {\n      \"automatic\": true,\n      \"single\": false,\n      \"label\": \"Your text\",\n      \"placeholder\": \"Hello world!\",\n      \"help\": \"Change the input or settings to update your result. Results update as you type. Up to 1,000,000 characters.\",\n      \"action\": null\n    },\n    \"mode\": \"automatic\",\n    \"interactive\": false\n  },\n  \"execution\": \"POST /api/v1/tools/voiceover-timing/run\",\n  \"api\": {\n    \"id\": \"voiceover-timing\",\n    \"name\": \"Voiceover timing\",\n    \"category\": \"speech-tools\",\n    \"description\": \"Estimate the speaking pace needed for a target duration.\",\n    \"notes\": \"\",\n    \"human_path\": \"/en/speech-tools/voiceover-timing/\",\n    \"method\": \"POST\",\n    \"endpoint\": \"/api/v1/tools/voiceover-timing/run\",\n    \"schema_url\": \"/api/v1/tools/voiceover-timing\",\n    \"input_schema\": {\n      \"type\": \"object\",\n      \"additionalProperties\": false,\n      \"properties\": {\n        \"input\": {\n          \"type\": \"string\",\n          \"maxLength\": 1000000,\n          \"default\": \"\",\n          \"description\": \"Plain text input. File tools use files instead unless otherwise documented.\"\n        },\n        \"options\": {\n          \"type\": \"object\",\n          \"additionalProperties\": false,\n          \"properties\": {\n            \"pace\": {\n              \"type\": \"number\",\n              \"description\": \"Speaking words per minute\",\n              \"default\": 150.0\n            }\n          }\n        }\n      }\n    },\n    \"output_schema\": {\n      \"type\": \"object\",\n      \"required\": [\n        \"tool\",\n        \"result\"\n      ],\n      \"properties\": {\n        \"tool\": {\n          \"type\": \"string\"\n        },\n        \"result\": {\n          \"type\": \"object\",\n          \"required\": [\n            \"text\",\n            \"files\"\n          ],\n          \"properties\": {\n            \"text\": {\n              \"type\": [\n                \"string\",\n                \"null\"\n              ]\n            },\n            \"data\": {\n              \"description\": \"Parsed JSON when the textual result is JSON.\"\n            },\n            \"name\": {\n              \"type\": \"string\"\n            },\n            \"mime\": {\n              \"type\": \"string\"\n            },\n            \"files\": {\n              \"type\": \"array\",\n              \"items\": {\n                \"type\": \"object\",\n                \"required\": [\n                  \"name\",\n                  \"mime\",\n                  \"bytes\",\n                  \"base64\"\n                ],\n                \"properties\": {\n                  \"name\": {\n                    \"type\": \"string\"\n                  },\n                  \"mime\": {\n                    \"type\": \"string\"\n                  },\n                  \"bytes\": {\n                    \"type\": \"integer\"\n                  },\n                  \"base64\": {\n                    \"type\": \"string\",\n                    \"contentEncoding\": \"base64\"\n                  }\n                }\n              }\n            }\n          }\n        }\n      }\n    },\n    \"processing\": \"Server; same transformation code as browser tools\",\n    \"limits\": {\n      \"request_bytes\": 8388608,\n      \"input_characters\": 1000000,\n      \"files_bytes\": 5242880,\n      \"max_files\": 0,\n      \"timeout_seconds\": 12\n    }\n  },\n  \"agent_processing\": \"Server; same transformation code as browser tools\",\n  \"browser_agent\": {\n    \"supported\": true,\n    \"name\": \"run_current_tool\",\n    \"discovery\": \"WebMCP on the human page in a supporting browser\",\n    \"verification\": \"See audit/API-AUDIT.md; availability is not verification\"\n  }\n}\n```\n\n## Page guide\n\nEstimate the speaking pace needed for a target duration.\n\n## Useful next steps\n\n- [Text to speech](https://happytails.ai/en/speech-tools/text-to-speech/): Read text aloud with a browser voice. ([Markdown](https://happytails.ai/en/speech-tools/text-to-speech.md))\n\n- [PDF to audio](https://happytails.ai/en/speech-tools/pdf-to-audio/): Read selectable PDF text aloud using a local system voice. ([Markdown](https://happytails.ai/en/speech-tools/pdf-to-audio.md))\n\n- [Pronunciation player](https://happytails.ai/en/speech-tools/pronunciation-player/): Hear words and phrases with an available browser voice. ([Markdown](https://happytails.ai/en/speech-tools/pronunciation-player.md))\n\n## How to use Voiceover timing\n\n1. Enter your text in the input field.\n2. The result updates as you type. Adjust the available settings if needed.\n3. Review the result, then use Copy result or a download link when available.\n\n## What to expect\n\nEstimate the speaking pace needed for a target duration. Enter the script and target duration. The result is a timing estimate based on word count; this tool does not generate or edit audio.\n"
}