While 16:9 (1.77:1) was initially selected as a compromise format, the subsequent popularity of HDTV broadcast has solidified 16:9 as perhaps the most common video aspect ratio in use.[5] Most 4:3 (1.33:1) and 2.40:1 video is now recorded using a "shoot and protect" technique[6] that keeps the main action within a 16:9 (1.77:1) inner rectangle to facilitate HD broadcast[citation needed].