Ach, du wolltest Links ;-):
most DVD content comes from film, which is inherently progressive. To make film content work in interlaced form, the video from each film frame is split into two video fields —240 lines in one field, and 240 lines in the other— and encoded as separate fields in the MPEG-2 stream.
MPEG-2 progressive_sequence is not allowed, but interlaced sequences can contain progressive pictures and progressive macroblocks.
There's enormous confusion about whether DVD video is progressive or interlaced. Here's the one true answer: Progressive-source video (such as from film) is usually encoded on DVD as interlaced field pairs that can be reinterleaved by a progressive player to recreate the original progressive video.
But sources which are truly progressive in nature are hard to come by right now. Movies on DVD are decoded by the player as interlaced fields. All of the film's original frames are there, but they are just divided into "halves".
As I mentioned earlier, film is stored on DVD as 480i at the equivalent of 24 frames per second. When a conventional player recognizes the appropriate MPEG-2 frame repeat flag, it performs the 3:2 pulldown in real-time, but progressive scan players can react to this flag in a different way. Such a player can create progressive video in real-time .It reconstructs each video frame by weaving together its odd and even fields, then repeats the video frames in a recurring 3:2 pattern (Anm.: Das heißt, auch ich habe mich bei NTSC Film etwas mißverständlich ausgedrückt, auch hier ist interlaced gespeichert).
Zitat
aber man kann es überall im netz nachlesen, so auch hier
So ist das mit Urban Legends, sie halten sich leider sehr lange. Wie gesagt, SDI greift direkt den Datenstrom am Decoder ab und gibt ausschließlich in 480i/ 576i aus.
edit: Aber selbst die Seite sagt aber etwas ganz anderes aus:
"Das Material auf der DVD ist also nicht in progressiver Form abgespeichert, obwohl dies eigentlich technisch möglich wäre."
Gruß
Denis