[FFmpeg-user] Change FPS

[Daniel Senderowicz]

At the moment of the purchase I chose the Wolverine because I didn't know
about the existence of the product you mentioned. But now, knowing about
it, and especially its price ($900), I would have still chosen the
wolveriine because it was $300 for the Pro model.

Without knowing much about ffmpeg nor mencoder, I think that I first have
to modify the file so to play it at a slightly slower, 18fps instead of
20fps without any changes in the number of frames - and after do some
interpolation (telecine?) to take it from 18fps to 30fps, is that right?

Thanks

On Fri, Mar 22, 2019 at 2:52 AM Carl Eugen Hoyos <ceffmpeg at gmail.com> wrote:

> 2019-03-22 4:56 GMT+01:00, Daniel Senderowicz <
> daniel.senderowicz at gmail.com>:
> > I have some old super8 films that I want to digitize. For that, I got a
> > Volverine Data Film2Digital movie maker. According to their specs, the
>
> I am personally interested: Where you able to compare with this scanner?
> https://www.amazon.com/Pacific-Image-Reflecta-Super-Scanner/dp/B076ZRJTV6
> Was the price the only reason to choose Film2Digital?
>
> > machine scans frame by frame and generates a video file at 20FPS.
> However,
> > the super8 films that I have were filmed at 18FPS, and I would like to
> > generate a final video file at 29.97 FPS for DVD burning.
>
> I believe you want to create a dvd with soft-telecine that contains
> (the correct) 18fps content but the dvd player knows how to play it
> on ntsc screens.
> MEncoder (and probably other software) can do this, FFmpeg does
> not support soft-telecine.
>
> > Can someone tell me how to use ffmpeg to do that conversion?
>
> You can use FFmpeg with the "-r" output option or the fps filter to
> duplicate frames to change the framerate of a video. This is - imo
> - not what you should do to create a dvd from your 18fps video.
> You also need either the input option "-r" or the setpts filter to
> change the speed of your video.
>
> Carl Eugen
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