576i is the shorthand name for a video mode. The i stands for interlaced, the 576 for a vertical resolution of 576 lines, usually with a horizontal resolution of 720 pixels and an aspect ratio of 4:3; that is standard-definition television (SDTV). The field rate (not the frame rate) is usually 50 Hertz and can be given explicitly after the letter (576i50). It is usually used in former PAL and SECAM countries for these are exactly that resolution, but analogue. It can be transported by both major digital television formats, ATSC and DVB, and on DVD.
1080i is near double the resolution of 576p or 576i and the difference is very noticeable on large screens at normal viewing distances.
Also note that Foxtel/Austar satellite or digital cable is no where near full 576i resolution due to excessive compression of the data stream and even free to air content is often of poor quality as well.
The difference being that the first 288 lines in field one are the even lines, and the second lot of 288 lines in field two are the odd lines (but its important to note that with native 50i both are from different moments in time so dont entirely line up).
The component input AUTO scans from a LOW of 576i to 1080i, it is adaptive signal bandwidth.
Progressive DVD players scans a 576i and ouptuts PAL encoded 576i and WEAVE frames A and B into film like mode which translates this in 576p.
The bonus for Australia is that PAL ordinary interlaced is 576i whereas in the US their base interlaced standard is 480i..far lesser in resolution then Australias in native interlaced video standard.
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