Using IndexedDB Client Side...

(x)
MP4 (Source) 1920 x 1080 93.38 MB
MP4 (360p) 640 x 360 33.41 MB
MP4 (480p) 854 x 480 51.45 MB
MP4 (720p) 1280 x 720 74.72 MB
MP4 (1080p) 1920 x 1080 97.46 MB