On Thu, 28 Oct 2004, Roman Shaposhnick wrote:
> Let's start from the very beginning -- you have your celluloid film,
> that runs at 24fps, you scan it and you want to encode result onto
> the NTSC DVD where the frame rate is 30fps (or 30000/1001). Obviously
Actually they run the film projector .1% slow to get 24000/1001 and
then run a 3:2 pulldown on that to get 30000/1001. At least that's
how I've had it explained to me.
> you start with *progressive* material, after all there's nothing
> more progressive than a strip of film. However, when you start
> putting it on DVD you have the following 3 choices:
Thanks for chiming in.
Hmmm, you interested in becoming a mjpegtools developer? We could
use some new ideas/code, etc :-)
But I think you are conflating 3:2 pulldown and interlacing. They're
not necessarily _both_ needed. The repeat first field, etc is
needed so that a progressive scan DVD player (coupled to a progressive
scan TV set of course) can reconstruct the progressive frames
> P.S. For much better explanation of how brain-dead DVD encoding
> could be feel free to visit:
>
> http://www.hometheaterhifi.com/volume_7_4/dvd-benchmark-part-5-progressive-10-2000.html
And the DVD Demystified site at http://www.dvddemystified.com is
a good read too.
Cheers,
Steven Schultz
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