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

[Alex Xu]

I put it there since it was in Huspnet's original command. I don't think it
matters, same problem occurs if I omit it or use -r 24000/1001 instead.

On Wed, May 28, 2025 at 3:41 PM Mark Filipak <markfilipak.imdb at gmail.com>
wrote:

> On 28/05/2025 18.36, Alex Xu wrote:
> > Got the same problematic result with
> >
> > ffmpeg -i detelecine_input.mkv -vf
> > "fieldmatch,decimate,drawtext=fontfile=Arial.ttf: text='%{frame_num}':
> > start_number=0: x=(w-tw)/2: y=h-(2*lh): fontcolor=black: fontsize=20:
> > box=1: boxcolor=white: boxborderw=5" -c:v libx264 -crf 18 -c:a aac -b:a
> > 192k -pix_fmt yuv420p -r 24 fieldmatch_decimate_only_frames.mkv
> >
> > So detelecine with it's fixed pattern worked best for me in this case.
> >
> > Purely as background information for people interested in detelecining,
> for
> > the nontruncated file I also added this to the start of video filter:
> >
> > select='not(eq(n,1002)+eq(n,2003)+eq(n,3004)+eq(n,4005))
> >
> > Since I noticed that the original file had a duplicated frame every 1000
> or
> > so frames. The sample file does not reach 1000 frames and I didn't
> mention
> > it earlier for simplicity.
> >
> > Alex
> >
> >
> >
> > On Wed, May 28, 2025 at 3:28 PM Mark Filipak <markfilipak.imdb at gmail.com
> >
> > wrote:
> >
> >> On 28/05/2025 18.07, Alex Xu wrote:
> >>> Thanks for your feedback, I tried your command but added a frame
> counter:
> >>>
> >>> ffmpeg -i detelecine_input.mkv -vf
> >>
> "fieldmatch=order=tff:combmatch=none,decimate,drawtext=fontfile=Arial.ttf:
> >>> text='%{frame_num}': start_number=0: x=(w-tw)/2: y=h-(2*lh):
> >>> fontcolor=black: fontsize=20: box=1: boxcolor=white: boxborderw=5" -c:v
> >>> libx264 -crf 18 -c:a aac -b:a 192k -pix_fmt yuv420p -r 24
> >>> fieldmatch_decimate_frames.mkv
>
> Why is "-r 24" there?
>
>
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