[FFmpeg-user] frame rate:24 or 24000/1001 for native movies

Phil Rhodes phil_rhodes at rocketmail.com
Thu Nov 1 02:13:56 EET 2018

Salient information:
It would be unusual for an NTSC-oriented DVD containing a feature film to have anything other than either 23.976 or 24fps material on it. 
A vanishingly small minority of DVDs containing feature films, particularly early releases made from the same tape masters that had been prepared for VHS duplication, may have 3:2 pulldown on them and you should be able to use special measures to unwind this if it's been done competently.
Feature films are very commonly shot at 23.976 (strictly 24000/1001.) Theoretically, anything on an NTSC-oriented DVD will be shown at that rate.

      From: Carl Eugen Hoyos <ceffmpeg at gmail.com>
 To: FFmpeg user questions <ffmpeg-user at ffmpeg.org> 
 Sent: Wednesday, 31 October 2018, 23:56
 Subject: Re: [FFmpeg-user] frame rate:24 or 24000/1001 for native movies
2018-10-31 23:27 GMT+01:00, sean darcy <seandarcy2 at gmail.com>:
> I've got a bunch of soft-telecined dvds. I'm trying to get them
> back to native format, 24fps.

Note that players should simply ignore the soft-telecine assuming
you are not using an old american tv set.

> ffmpeg -i input.vob -r [??????] output.mp4

The ntsc framerate is 30000/1001, if you divide this by the usual
telecine rate, you get 24000/1001. FFmpeg's console output will
tell you if it had to drop or duplicate frames. If - except maybe for
the absolute start of the video to correct different audio and video
start times - no frames are dropped or duplicated, the output frame
rate is correct.

Carl Eugen
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