json_schema: {
      "$schema": "http://json-schema.org/draft-04/schema#",
      "id": "http://www.ortolang.fr/schemas/1/video#",
      "description": "Schema for metadata extracted from video files",
      "type": "object",
      "additionalProperties": true,
      "properties": {
          "tiff:ImageLength": {
              "type": "string"
          },
          "tiff:ImageWidth": {
              "type": "string"
          },
          "xmpDM:duration": {
              "type": "string"
          },
          "xmpDM:audioSampleRate": {
              "type": "string"
          }
      }
  }