Razorguns
Well-known member
Currently (to my understanding) different shows/channels broadcast in either 720p or 1080i based on what they feel is the most clear(or profitable).
It's because the originating source only shot in 720 or 1080. Not every production company is HD capable. Many only have infrastrucute to handle 720p or still are clueless about 1080 interlacing. Or even 1080 in general (eg: Group of Frame compression, 1.33 pixel aspect ratio, etc.).
Generally, if it's not news or live sports, shoot progressive. The broadcaster converts it and sends it out interlaced. A lot of older HD footage is only 720p.
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