{
  "lexicon": 1,
  "id": "app.bsky.video.startUpload",
  "defs": {
    "main": {
      "type": "procedure",
      "description": "Start a multipart video upload. The declared size is exact, while optional media properties are advisory and used only for early failure; the authoritative probe runs asynchronously after upload.",
      "input": {
        "encoding": "application/json",
        "schema": {
          "type": "object",
          "required": ["sizeBytes", "mimeType"],
          "properties": {
            "sizeBytes": {
              "type": "integer",
              "minimum": 1,
              "description": "Exact byte size of the complete upload-ready video file before it is split into parts."
            },
            "mimeType": {
              "type": "string",
              "minLength": 3,
              "maxLength": 255,
              "description": "Declared MIME type of the video."
            },
            "name": {
              "type": "string",
              "maxLength": 256,
              "description": "Optional client-provided file name."
            },
            "durationMs": {
              "type": "integer",
              "description": "Advisory, non-authoritative duration used only for early failure; the authoritative probe runs asynchronously after upload."
            },
            "width": {
              "type": "integer",
              "description": "Advisory, non-authoritative width used only for early failure; the authoritative probe runs asynchronously after upload."
            },
            "height": {
              "type": "integer",
              "description": "Advisory, non-authoritative height used only for early failure; the authoritative probe runs asynchronously after upload."
            }
          }
        }
      },
      "output": {
        "encoding": "application/json",
        "schema": {
          "type": "object",
          "required": ["jobId", "partSizeBytes", "partCount", "expiresAt"],
          "properties": {
            "jobId": { "type": "string", "minLength": 1, "maxLength": 256 },
            "partSizeBytes": { "type": "integer" },
            "partCount": { "type": "integer" },
            "expiresAt": { "type": "string", "format": "datetime" }
          }
        }
      },
      "errors": [
        {
          "name": "UnsupportedContentType",
          "description": "The declared MIME type is not supported."
        },
        {
          "name": "VideoTooLarge",
          "description": "The exact file size exceeds the per-file cap or remaining daily byte allowance."
        },
        {
          "name": "VideoTooLong",
          "description": "The advisory declared duration exceeds the limit."
        },
        {
          "name": "BadAspectRatio",
          "description": "The advisory declared dimensions have an unsupported aspect ratio."
        },
        {
          "name": "DailyLimitExceeded",
          "description": "The daily video or byte allowance, including active reservations, is exhausted."
        },
        {
          "name": "TooManyOpenUploads",
          "description": "The account has reached its open multipart upload limit."
        },
        {
          "name": "UploadForbidden",
          "description": "The account is not permitted to upload video."
        },
        {
          "name": "ServiceOverloaded",
          "description": "The service is draining, at capacity, or temporarily unable to create the multipart upload."
        }
      ]
    }
  }
}