What is the source of professional DVD assets?

When a Hollywood movie is encoded to MPEG-2 for DVD, what is the source? I find it hard to believe that it arrives as a telecined film-to-tape transfer due to the inherent problems of IVTC and 3:2 pulldown neccessary to create a progressive MPEG-2. Anyone know what is used?

usually film -> DVD, or an export from avid or the like. Enf...

I work in a authoring company, and we do many DVD with true movie, also DTS audio and so on. The last our big title was "Amelie". The path from film to DVD is Film->Betacam digital->Mpeg2 encoder, for video, and Tascam DA88 (or DA98, if we need 96Khz 24bit)-> editing system (we use Nuendo) for mixing and/or sync the reel-> Encoding Dolby or DTS (we use software encoding for audio). Only some project have different source. Avid is used in some company ONLY for build animated menus. When No compressed AVID is used for editing (music projects, concert...), the material is recorded on Betacam Digital, with a SDI digital connection. Cupid

I guess MNale is asking about NTSC DVDs (IVTC and 3:2 Pulldown). It's an intresting question. If the mpeg stream on a NTSC DVD is 23.97fps and the player does the convertion to 29.97fps, then is the 24fps film telecined to a special 24fps Digi Beta??

@cupid59 "The path from film to DVD is Film->Betacam digital->Mpeg2 encoder, for video" So you receive your material telecined with a 3:2 pulldown on DigiBeta? If so, what SDI MPEG2 encoder do you use (that handles the IVTC)?