[FFmpeg-user] Detelecine: I got the right result from the wrong command?

[Paul B Mahol]

On Thu, May 29, 2025 at 9:46 AM Mark Filipak <markfilipak.imdb at gmail.com>
wrote:

> Oh, I should add this: When I detelecined "1492, CONQUEST OF PARADISE" via
> the 'detelecine' filter I
> got judder in panning shots. I got no judder via 'fieldmatch, decimate'.
>

Irrelevant.

>
>
> On 29/05/2025 00.30, Alex Xu wrote:
> > I tried running your exact command and got the same result. Dropped frame
> > 173 and a later duplicated frame.
> >
> > I've attached 15 frames here of the results.
> >
> >
> https://drive.google.com/drive/folders/139rjLqsxIuAO_3yzVNe4dD7-gI9YPRgn?usp=drive_link
> >
> > I've attached 5 frames each of the original input, using detelecine, and
> > using fieldmatch+decimate with your command.
>
> Thanks for those pictures. They make this a little easier.
>
> First, some preparation:
>
> This section of detelecine is:
> [Cd][Dd][Aa][Bb][Bc] -> [Cc][Dd][Aa][Bb]
>
>  From input.mkv:
> Frame 215 @ 7.174  =input-0001.png [Cd]
> Frame 216 @ 7.207  =input-0002.png [Dd]
> Frame 217 @ 7.241  =input-0003.png [Aa]
> Frame 218 @ 7.274  =input-0004.png [Bb]
> Frame 219 @ 7.307  =input-0005.png [Bc]
>
> Now, the results:
>
> ffmpeg^
>   -i input.mkv^
>   -vf fieldmatch,decimate^
>   -c:a aac^
>   -c:v libx264^
>   output.mkv
>
> Honestly, from the command line above, I'm getting
> exactly what you got using 'detelecine'. Look:
>
> Frame 172 @ 7.174  =detelecine1.png [Cc]
> Frame 173 @ 7.215  =detelecine2.png [Dd]
> Frame 174 @ 7.257  =detelecine3.png [Aa]
> Frame 175 @ 7.299  =detelecine4.png [Bb]
>
> No missing frame, no repeated frame.
>
> I have no idea why your FFmpeg is different.
>
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