{ "mediaObjectId" : "79235C36C7A9001EE0538C93F116001E", "mediaType" : "V", "mimetype" : "application/x-video", "background" : "//stream-media.loc.gov/webcasts/2018/180323his1500/data/180323his1500_1280x720_2000_bg.jpg", "aspectRatio" : "4:3", "autoPlay" : false, "playerSize" : "largeWide", "metadata" : [''], "expandAccessibility" : false }