Re: iBook and playing DVDs
On Wed, 2002-05-15 at 11:02, Adrian Cox wrote:
> On 15 May 2002 00:05:59 +0200
> Michel D <daenzer@debian.org> wrote:
>
> > On Mon, 2002-05-13 at 22:04, Rogério Brito wrote:
> > > On May 12 2002, Michel Dänzer wrote:
> > > >
> > > > Well, the actual movies shouldn't be interlaced.
> > >
> > > Well, I read that also in Ben's reply and got surprised, since
> > > without exception all DVDs that I have seen to this day are
> > > interlaced.
> >
> > Sounds like bad encodings. The original movies as shown in theaters obviously
> > aren't interlaced so if a DVD is that's purely artificial.
>
> Are you sure about this? I thought most DVDs carried either interlaced
> NTSC or interlaced PAL. In the NTSC case the movie is converted to
> 30fps interlaced by a 3:2 pulldown (3 fields from one frame, 2 fields
> from the next). In the PAL case each frame is split into two fields,
> which speeds the film up slightly. Adjusting the pitch of the audio is
> optional in this case. I believe that in both cases this is normally
> done when mastering the DVD, to allow for manual tweaking of the
> process.
You're right, forgot about this, but in the PAL case the two fields are
basically the same as one frame, right? Maybe that's why I haven't
noticed any interlacing yet.
--
Earthling Michel Dänzer (MrCooper)/ Debian GNU/Linux (powerpc) developer
XFree86 and DRI project member / CS student, Free Software enthusiast
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