{ "mediaObjectId" : "713940E84F30005CE0538C93F116005C", "mediaType" : "V", "mimetype" : "application/x-video", "background" : "//stream-media.loc.gov/webcasts/2018/180308yrc1030/data/180308yrc1030_1280x720_2000_bg.jpg", "aspectRatio" : "4:3", "autoPlay" : false, "playerSize" : "largeWide", "metadata" : [''], "expandAccessibility" : false }