{ "title": "Merge video", "human_url": "https://happytails.ai/en/media-tools/merge-video/", "agent_url": "https://happytails.ai/agents/en/media-tools/merge-video/", "language": "en", "markdown_url": "https://happytails.ai/en/media-tools/merge-video.md", "content": "Merge video\nJoin clips into one video with a consistent frame size.\nUseful next steps\nMP4 to MP3\nConvert MP4 files to MP3 with the available format settings.\nWAV to MP3\nConvert WAV files to MP3 with the available format settings.\nM4a to MP3\nConvert M4A files to MP3 with the available format settings.\nHow to use Merge video\nChoose one or more files in MP4, MOV, MKV, WEBM or AVI.\nReview the settings, then choose Run Merge video.\nReview the result, then use Copy result or a download link when available.\nWhat to expect\nJoin clips into one video with a consistent frame size. Browser processing keeps files on this device. Choosing Local server sends files to this website’s own processor. Joins clips in order at 640 × 360. All clips must either have audio or have no audio.", "content_format": "text/plain", "visibility": "public", "links": [ { "name": "MP4 to MP3 Convert MP4 files to MP3 with the available format settings.", "url": "https://happytails.ai/en/media-tools/mp4-to-mp3/" }, { "name": "WAV to MP3 Convert WAV files to MP3 with the available format settings.", "url": "https://happytails.ai/en/media-tools/wav-to-mp3/" }, { "name": "M4a to MP3 Convert M4A files to MP3 with the available format settings.", "url": "https://happytails.ai/en/media-tools/m4a-to-mp3/" } ], "tool": { "id": "merge-video", "category": "media-tools", "built": true, "requirements": "Clip ordering, aspect ratio and audio tracks; test output sync.", "implementation": { "fields": [ { "key": "engine", "label": "Processing location", "type": "select", "value": "browser", "values": [ "browser", "server" ], "labels": { "browser": "Browser (files stay here)", "server": "Local server (larger files)" } } ], "files": true, "accept": ".mp4,.mov,.mkv,.webm,.avi", "multiple": true, "input": false, "processing": "Browser or server", "native": true, "maxFileBytes": 20971520, "note": "Browser processing keeps files on this device. Choosing Local server sends files to this website’s own processor. Joins clips in order at 640 × 360. All clips must either have audio or have no audio.", "hybrid": true, "experience": { "automatic": false, "single": false, "label": "Your text", "placeholder": "Type or paste your input…", "help": "Up to 1,000,000 characters. Review the settings before running.", "action": null }, "mode": "explicit", "interactive": false }, "execution": "POST /api/v1/tools/merge-video/run", "api": { "id": "merge-video", "name": "Merge video", "category": "media-tools", "description": "Join clips into one video with a consistent frame size.", "notes": "Browser processing keeps files on this device. Choosing Local server sends files to this website’s own processor. Joins clips in order at 640 × 360. All clips must either have audio or have no audio.", "human_path": "/en/media-tools/merge-video/", "method": "POST", "endpoint": "/api/v1/tools/merge-video/run", "schema_url": "/api/v1/tools/merge-video", "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": { "engine": { "type": "string", "description": "Processing location", "default": "browser", "enum": [ "browser", "server" ] } } }, "files": { "type": "array", "maxItems": 20, "items": { "type": "object", "required": [ "name", "base64" ], "additionalProperties": false, "properties": { "name": { "type": "string", "maxLength": 200, "description": "Filename only, no path." }, "mime": { "type": "string", "maxLength": 150 }, "bytes": { "type": "integer", "minimum": 0, "description": "Optional decoded byte count; must match content if supplied." }, "base64": { "type": "string", "contentEncoding": "base64", "description": "File bytes as padded base64. Use the tool-specific limits.files_bytes value for the total decoded input size." } } } } } }, "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; self-hosted native engine, no external conversion service", "limits": { "request_bytes": 31457280, "input_characters": 1000000, "files_bytes": 20971520, "max_files": 20, "timeout_seconds": 90 } }, "agent_processing": "Server; self-hosted native engine, no external conversion service", "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": "# Merge video\n\n- Human page: https://happytails.ai/en/media-tools/merge-video/\n- Markdown: https://happytails.ai/en/media-tools/merge-video.md\n- Structured JSON: https://happytails.ai/agents/en/media-tools/merge-video/index.json\n- Visibility: public\n\n## Tool capabilities\n\n| Property | Value |\n| --- | --- |\n| Tool ID | `merge-video` |\n| Category | media-tools |\n| Implementation | Registered implementation. Registration alone is not a production-quality guarantee. |\n| Browser execution | Use the visible action or interactive controls. |\n| Browser processing | Browser or server |\n| HTTP API | /api/v1/tools/merge-video/run |\n| Browser-agent interface | run_current_tool |\n\n### Implementation notes\n\nBrowser processing keeps files on this device. Choosing Local server sends files to this website’s own processor. Joins clips in order at 640 × 360. All clips must either have audio or have no audio.\n\n### Inputs and settings\n\nNo free-text input is required. Use the file inputs and/or settings below.\n\nAccepted browser files: `.mp4,.mov,.mkv,.webm,.avi`. Multiple files are supported.\n\nBrowser file-input limit: 20971520 bytes in total. HTTP limits can differ.\n\n| Setting | Meaning | Control type | Default | Constraints |\n| --- | --- | --- | --- | --- |\n| `engine` | Processing location | select | \"browser\" | Allowed: browser, server |\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/merge-video/run\nContent-Type: application/json\n```\n\n[Detailed operation reference](https://happytails.ai/en/api/tools/merge-video.md) · [Shared API guide](https://happytails.ai/en/api.md)\n\n#### Limits\n\n| Limit | Value |\n| --- | --- |\n| request_bytes | 31457280 |\n| input_characters | 1000000 |\n| files_bytes | 20971520 |\n| max_files | 20 |\n| timeout_seconds | 90 |\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 \"engine\": {\n \"type\": \"string\",\n \"description\": \"Processing location\",\n \"default\": \"browser\",\n \"enum\": [\n \"browser\",\n \"server\"\n ]\n }\n }\n },\n \"files\": {\n \"type\": \"array\",\n \"maxItems\": 20,\n \"items\": {\n \"type\": \"object\",\n \"required\": [\n \"name\",\n \"base64\"\n ],\n \"additionalProperties\": false,\n \"properties\": {\n \"name\": {\n \"type\": \"string\",\n \"maxLength\": 200,\n \"description\": \"Filename only, no path.\"\n },\n \"mime\": {\n \"type\": \"string\",\n \"maxLength\": 150\n },\n \"bytes\": {\n \"type\": \"integer\",\n \"minimum\": 0,\n \"description\": \"Optional decoded byte count; must match content if supplied.\"\n },\n \"base64\": {\n \"type\": \"string\",\n \"contentEncoding\": \"base64\",\n \"description\": \"File bytes as padded base64. Use the tool-specific limits.files_bytes value for the total decoded input size.\"\n }\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\nClip ordering, aspect ratio and audio tracks; test output sync.\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\": \"merge-video\",\n \"category\": \"media-tools\",\n \"built\": true,\n \"requirements\": \"Clip ordering, aspect ratio and audio tracks; test output sync.\",\n \"implementation\": {\n \"fields\": [\n {\n \"key\": \"engine\",\n \"label\": \"Processing location\",\n \"type\": \"select\",\n \"value\": \"browser\",\n \"values\": [\n \"browser\",\n \"server\"\n ],\n \"labels\": {\n \"browser\": \"Browser (files stay here)\",\n \"server\": \"Local server (larger files)\"\n }\n }\n ],\n \"files\": true,\n \"accept\": \".mp4,.mov,.mkv,.webm,.avi\",\n \"multiple\": true,\n \"input\": false,\n \"processing\": \"Browser or server\",\n \"native\": true,\n \"maxFileBytes\": 20971520,\n \"note\": \"Browser processing keeps files on this device. Choosing Local server sends files to this website’s own processor. Joins clips in order at 640 × 360. All clips must either have audio or have no audio.\",\n \"hybrid\": true,\n \"experience\": {\n \"automatic\": false,\n \"single\": false,\n \"label\": \"Your text\",\n \"placeholder\": \"Type or paste your input…\",\n \"help\": \"Up to 1,000,000 characters. Review the settings before running.\",\n \"action\": null\n },\n \"mode\": \"explicit\",\n \"interactive\": false\n },\n \"execution\": \"POST /api/v1/tools/merge-video/run\",\n \"api\": {\n \"id\": \"merge-video\",\n \"name\": \"Merge video\",\n \"category\": \"media-tools\",\n \"description\": \"Join clips into one video with a consistent frame size.\",\n \"notes\": \"Browser processing keeps files on this device. Choosing Local server sends files to this website’s own processor. Joins clips in order at 640 × 360. All clips must either have audio or have no audio.\",\n \"human_path\": \"/en/media-tools/merge-video/\",\n \"method\": \"POST\",\n \"endpoint\": \"/api/v1/tools/merge-video/run\",\n \"schema_url\": \"/api/v1/tools/merge-video\",\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 \"engine\": {\n \"type\": \"string\",\n \"description\": \"Processing location\",\n \"default\": \"browser\",\n \"enum\": [\n \"browser\",\n \"server\"\n ]\n }\n }\n },\n \"files\": {\n \"type\": \"array\",\n \"maxItems\": 20,\n \"items\": {\n \"type\": \"object\",\n \"required\": [\n \"name\",\n \"base64\"\n ],\n \"additionalProperties\": false,\n \"properties\": {\n \"name\": {\n \"type\": \"string\",\n \"maxLength\": 200,\n \"description\": \"Filename only, no path.\"\n },\n \"mime\": {\n \"type\": \"string\",\n \"maxLength\": 150\n },\n \"bytes\": {\n \"type\": \"integer\",\n \"minimum\": 0,\n \"description\": \"Optional decoded byte count; must match content if supplied.\"\n },\n \"base64\": {\n \"type\": \"string\",\n \"contentEncoding\": \"base64\",\n \"description\": \"File bytes as padded base64. Use the tool-specific limits.files_bytes value for the total decoded input size.\"\n }\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; self-hosted native engine, no external conversion service\",\n \"limits\": {\n \"request_bytes\": 31457280,\n \"input_characters\": 1000000,\n \"files_bytes\": 20971520,\n \"max_files\": 20,\n \"timeout_seconds\": 90\n }\n },\n \"agent_processing\": \"Server; self-hosted native engine, no external conversion service\",\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\nJoin clips into one video with a consistent frame size.\n\n## Useful next steps\n\n- [MP4 to MP3](https://happytails.ai/en/media-tools/mp4-to-mp3/): Convert MP4 files to MP3 with the available format settings. ([Markdown](https://happytails.ai/en/media-tools/mp4-to-mp3.md))\n\n- [WAV to MP3](https://happytails.ai/en/media-tools/wav-to-mp3/): Convert WAV files to MP3 with the available format settings. ([Markdown](https://happytails.ai/en/media-tools/wav-to-mp3.md))\n\n- [M4a to MP3](https://happytails.ai/en/media-tools/m4a-to-mp3/): Convert M4A files to MP3 with the available format settings. ([Markdown](https://happytails.ai/en/media-tools/m4a-to-mp3.md))\n\n## How to use Merge video\n\n1. Choose one or more files in MP4, MOV, MKV, WEBM or AVI.\n2. Review the settings, then choose Run Merge video.\n3. Review the result, then use Copy result or a download link when available.\n\n## What to expect\n\nJoin clips into one video with a consistent frame size. Browser processing keeps files on this device. Choosing Local server sends files to this website’s own processor. Joins clips in order at 640 × 360. All clips must either have audio or have no audio.\n" }