frame rate conversion

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frame rate conversion

Daniel Senderowicz
I just purchased a film scanner for my very old 8mm and super8 movies. This
machine (Wolverine pro) generates a MP4 file at 20fps (only option). I
would like to convert these files to 30fps (29.97?) so I can burn DVDs. My
math is a bit fuzzy now, for example the super8 films have a frame rate of
18fps, so my question is what would be the proper ffmpeg command line to
achieve this?

Many thanks in advance.

Daniel
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Re: frame rate conversion

Carl Eugen Hoyos-2
2018-11-24 20:06 GMT+01:00, Daniel Senderowicz <[hidden email]>:
> I just purchased a film scanner for my very old 8mm and super8 movies. This
> machine (Wolverine pro) generates a MP4 file at 20fps (only option). I
> would like to convert these files to 30fps (29.97?) so I can burn DVDs.

I believe the correct way to do this is "soft-telecine" which is
not supported by FFmpeg but MEncoder.

The alternative is to duplicate frames which will not look nice:
$ ffmpeg -i input -target ntsc-dvd out.vob
(This implies -r 30000/1001 iirc)

Carl Eugen
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Re: frame rate conversion

Daniel Senderowicz
So how should I do that with MEncoder?

Thanks

On Sat, Nov 24, 2018 at 2:39 PM Carl Eugen Hoyos <[hidden email]> wrote:

> 2018-11-24 20:06 GMT+01:00, Daniel Senderowicz <
> [hidden email]>:
> > I just purchased a film scanner for my very old 8mm and super8 movies.
> This
> > machine (Wolverine pro) generates a MP4 file at 20fps (only option). I
> > would like to convert these files to 30fps (29.97?) so I can burn DVDs.
>
> I believe the correct way to do this is "soft-telecine" which is
> not supported by FFmpeg but MEncoder.
>
> The alternative is to duplicate frames which will not look nice:
> $ ffmpeg -i input -target ntsc-dvd out.vob
> (This implies -r 30000/1001 iirc)
>
> Carl Eugen
> _______________________________________________
> ffmpeg-user mailing list
> [hidden email]
> http://ffmpeg.org/mailman/listinfo/ffmpeg-user
>
> To unsubscribe, visit link above, or email
> [hidden email] with subject "unsubscribe".
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Re: frame rate conversion

Carl Eugen Hoyos-2
2018-11-24 23:48 GMT+01:00, Daniel Senderowicz <[hidden email]>:
> So how should I do that with MEncoder?

I have asked for an example in this ticket (and there is one):
https://trac.ffmpeg.org/ticket/2602
An alternative is to google for "mencoder soft telecine".

Please do not top-post here, Carl Eugen
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Re: frame rate conversion

Daniel Senderowicz
What I found on the internet are cases of converting 24fps to 30fps, but my
case is different. These movies have been filmed at 18fps, the digitizing
was done at 20fps, so how do I handle the arithmetic for this case?

On Sat, Nov 24, 2018 at 2:55 PM Carl Eugen Hoyos <[hidden email]> wrote:

> 2018-11-24 23:48 GMT+01:00, Daniel Senderowicz <
> [hidden email]>:
> > So how should I do that with MEncoder?
>
> I have asked for an example in this ticket (and there is one):
> https://trac.ffmpeg.org/ticket/2602
> An alternative is to google for "mencoder soft telecine".
>
> Please do not top-post here, Carl Eugen
> _______________________________________________
> ffmpeg-user mailing list
> [hidden email]
> http://ffmpeg.org/mailman/listinfo/ffmpeg-user
>
> To unsubscribe, visit link above, or email
> [hidden email] with subject "unsubscribe".
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Re: frame rate conversion

Carl Eugen Hoyos-2
2018-11-25 0:02 GMT+01:00, Daniel Senderowicz <[hidden email]>:
> What I found on the internet are cases of converting 24fps to 30fps, but my
> case is different. These movies have been filmed at 18fps, the digitizing
> was done at 20fps, so how do I handle the arithmetic for this case?

You may be right that the input frame rate does make a difference (and
that MEncoder only supports 24000/1001 -> 30000/1001 muxing, I don't
remember), in this case it may not make a difference and you can use
FFmpeg which will simply repeat the frames as necessary, no
additional calculations needed.

You can overwrite the input frame rate with "-r" if this is your question.

Please stop top-posting!

Carl Eugen
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Re: frame rate conversion

Daniel Senderowicz
How do I set the -r entry for my case?

What is top-posting? Am I doint something wrong?

On Sat, Nov 24, 2018 at 3:33 PM Carl Eugen Hoyos <[hidden email]> wrote:

> 2018-11-25 0:02 GMT+01:00, Daniel Senderowicz <
> [hidden email]>:
> > What I found on the internet are cases of converting 24fps to 30fps, but
> my
> > case is different. These movies have been filmed at 18fps, the digitizing
> > was done at 20fps, so how do I handle the arithmetic for this case?
>
> You may be right that the input frame rate does make a difference (and
> that MEncoder only supports 24000/1001 -> 30000/1001 muxing, I don't
> remember), in this case it may not make a difference and you can use
> FFmpeg which will simply repeat the frames as necessary, no
> additional calculations needed.
>
> You can overwrite the input frame rate with "-r" if this is your question.
>
> Please stop top-posting!
>
> Carl Eugen
> _______________________________________________
> ffmpeg-user mailing list
> [hidden email]
> http://ffmpeg.org/mailman/listinfo/ffmpeg-user
>
> To unsubscribe, visit link above, or email
> [hidden email] with subject "unsubscribe".
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