text: # this dict holds all the allowed extensions with their corresponding descriptions
  allowed_extensions = {
      "mkv": "Matroska-Video",
      "mp4": "MPEG-4",
      "wmv": "Windows Media Video",
      "mov": "Quicktime Movie",
      "m2ts": "BDAV Video File",
      "f4v": "Flash Video"
  }
  