<https://sp.nicovideo.jp/watch/so21488241>
<http://schema.org/thumbnailUrl>
<https://img.cdn.nimg.jp/s/nicovideo/thumbnails/21488241/21488241.original/r1280x720l?key=582524aa2242a1f0504ff13d67b97791f66dc7763106437603c6d001be45f1ff>
<https://sp.nicovideo.jp/watch/1375336066>