{ "openapi": "3.1.1", "info": { "title": "Video to MP3 Extractor API", "version": "1.0.0", "summary": "Extract a video’s soundtrack as MP3, WAV or FLAC, or copy the original audio losslessly.", "description": "Every endpoint performs the same calculation as the human page and returns inputs, result, units, assumptions, sources, warnings and computedAt. MCP endpoint: /mcp." }, "servers": [ { "url": "https://videotoaudioextractor.usefulweb.site" } ], "paths": { "/api/v1/calculate": { "post": { "operationId": "calculate", "summary": "Extract a video’s soundtrack as MP3, WAV or FLAC, or copy the original audio losslessly.", "description": "Extracts an audio track from MP4, MOV, MKV, WebM, AVI and other videos. Pick the track if there are several (e.g. languages), save it as MP3 (VBR or CBR), WAV or FLAC, or copy the original AAC/Opus/Vorbis/MP3/FLAC stream into M4A/Ogg/MP3/FLAC without re-encoding. Optional start/end trim.\n\nMethodology:\n- ffprobe lists the audio tracks (codec, channels, sample rate, language). The chosen track is mapped with -map 0:a:N; video, subtitles and data are dropped.\n- MP3 uses LAME VBR (-q:a 0/2/4) or CBR; WAV is 16-bit PCM; FLAC is lossless level 5.\n- \"Copy\" keeps the original bitstream: AAC/ALAC → M4A, MP3 → MP3, Opus → .opus (Ogg), Vorbis → Ogg, FLAC → FLAC, 16/24-bit PCM → WAV. Other codecs (e.g. AC-3, DTS) need re-encoding and are refused in copy mode.\n- Trimming seeks to the start time and stops after the requested length. In copy mode cuts land on audio frame boundaries (a few milliseconds).", "tags": [ "media" ], "x-mcp-tool": "video_to_audio_extractor", "requestBody": { "required": true, "content": { "application/json": { "schema": { "$ref": "#/components/schemas/VideoToAudioExtractorInput" }, "examples": { "example1": { "summary": "Soundtrack of a test clip as MP3", "value": { "file": { "filename": "clip.mp4", "contentType": "video/mp4", "contentBase64": 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}, "format": "mp3", "mp3Quality": "128" } }, "example2": { "summary": "Copy the original AAC track into M4A", "value": { "file": { "filename": "clip.mp4", "contentType": "video/mp4", "contentBase64": 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}, "format": "copy" } } } } } }, "responses": { "200": { "description": "Calculation result envelope.", "content": { "application/json": { "schema": { "$ref": "#/components/schemas/VideoToAudioExtractorResult" } } } }, "400": { "description": "Malformed JSON body.", "content": { "application/problem+json": { "schema": { "$ref": "#/components/schemas/Problem" } } } }, "422": { "description": "Invalid input (see errors[]).", "content": { "application/problem+json": { "schema": { "$ref": "#/components/schemas/Problem" } } } }, "429": { "description": "Rate limit exceeded (see Retry-After).", "content": { "application/problem+json": { "schema": { "$ref": "#/components/schemas/Problem" } } } } } } }, "/api/v1/tool": { "get": { "operationId": "getToolDefinition", "summary": "Inputs, output schema and examples for this tool", "responses": { "200": { "description": "Tool definition.", "content": { "application/json": { "schema": { "type": "object" } } } } } } } }, "components": { "schemas": { "Problem": { "type": "object", "description": "RFC 9457 problem details. 422 responses include per-field `errors`.", "required": [ "type", "title", "status", "detail" ], "properties": { "type": { "type": "string" }, "title": { "type": "string" }, "status": { "type": "integer" }, "detail": { "type": "string" }, "code": { "type": "string" }, "errors": { "type": "array", "items": { "type": "object", "required": [ "field", "message" ], "properties": { "field": { "type": "string" }, "message": { "type": "string" } } } } } }, "VideoToAudioExtractorInput": { "type": "object", "additionalProperties": false, "properties": { "file": { "title": "Video file", "description": "MP4, MOV, MKV, WebM, AVI, MPEG-TS, WMV, FLV; max 250 MB and 20 minutes. Processed on our server in a private temporary folder that is deleted afterwards; the result can be downloaded for about 2 hours. Upload as {filename, contentType?, contentBase64}. Max 256000 KiB. Accepts .mp4,.m4v,.mov,.mkv,.webm,.avi,.ts,.mts,.m2ts,.mpg,.mpeg,.wmv,.flv,.3gp,video/*.", "type": "object", "additionalProperties": false, "required": [ "filename", "contentBase64" ], "properties": { "filename": { "type": "string" }, "contentType": { "type": "string" }, "contentBase64": { "type": "string" } } }, "stream": { "title": "Audio track number", "description": "1 = first audio track. The report lists all tracks with language and codec.", "type": "integer", "minimum": 1, "maximum": 32, "default": 1 }, "format": { "title": "Output", "type": "string", "enum": [ "mp3", "wav", "flac", "copy" ], "default": "mp3" }, "mp3Quality": { "title": "MP3 quality", "type": "string", "enum": [ "v0", "v2", "v4", "320", "192", "128" ], "default": "v2" }, "start": { "title": "Start time", "description": "Optional. Seconds, mm:ss or hh:mm:ss.mmm.", "type": "string", "maxLength": 20 }, "end": { "title": "End time", "description": "Optional. Empty = to the end.", "type": "string", "maxLength": 20 } }, "required": [ "file" ] }, "VideoToAudioExtractorResult": { "type": "object", "additionalProperties": false, "required": [ "schemaVersion", "tool", "computedAt", "inputs", "summary", "result", "units", "assumptions", "sources", "warnings", "presentation", "links" ], "properties": { "schemaVersion": { "type": "string", "const": "1.0" }, "tool": { "type": "object", "additionalProperties": false, "required": [ "id", "name", "version" ], "properties": { "id": { "type": "string" }, "name": { "type": "string" }, "version": { "type": "string" } } }, "computedAt": { "type": "string", "format": "date-time" }, "inputs": { "type": "object", "description": "Normalised inputs actually used, including applied defaults." }, "summary": { "type": "string" }, "result": { "type": "object", "additionalProperties": false, "required": [ "tracks", "selectedTrack", "sourceCodec", "outputFormat", "reencoded", "startSeconds", "endSeconds", "durationSeconds", "outputBytes", "artifact" ], "properties": { "tracks": { "type": "array", "items": { "type": "object", "additionalProperties": false, "required": [ "track", "codec", "channels", "sampleRate", "language" ], "properties": { "track": { "type": "integer" }, "codec": { "type": "string" }, "channels": { "type": [ "integer", "null" ] }, "sampleRate": { "type": [ "integer", "null" ] }, "language": { "type": [ "string", "null" ] } } } }, "selectedTrack": { "type": "integer" }, "sourceCodec": { "type": "string" }, "outputFormat": { "type": "string" }, "reencoded": { "type": "boolean" }, "startSeconds": { "type": "number" }, "endSeconds": { "type": "number" }, "durationSeconds": { "type": "number" }, "outputBytes": { "type": "integer" }, "artifact": { "type": "object", "additionalProperties": false, "required": [ "artifactId", "filename", "mime", "bytes", "sha256", "path" ], "properties": { "artifactId": { "type": "string" }, "filename": { "type": "string" }, "mime": { "type": "string" }, "bytes": { "type": "integer" }, "sha256": { "type": "string" }, "path": { "type": "string", "description": "Download path on the same site (valid for about 2 hours)." } } } } }, "units": { "type": "object", "additionalProperties": { "type": "string" } }, "assumptions": { "type": "array", "items": { "type": "string" } }, "sources": { "type": "array", "items": { "type": "object", "additionalProperties": false, "required": [ "title" ], "properties": { "title": { "type": "string" }, "url": { "type": "string" }, "publisher": { "type": "string" }, "retrievedAt": { "type": "string" }, "note": { "type": "string" } } } }, "warnings": { "type": "array", "items": { "type": "string" } }, "presentation": { "type": "array", "items": { "type": "object" }, "description": "Display blocks used by the human page (same data)." }, "links": { "type": "object", "additionalProperties": false, "required": [ "human", "api", "openapi", "methodology" ], "properties": { "human": { "type": "string", "format": "uri" }, "api": { "type": "string", "format": "uri" }, "openapi": { "type": "string", "format": "uri" }, "methodology": { "type": "string", "format": "uri" } } } } } } } }