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.i...@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
>
> That is not best. Try -vf fieldmatch,decimate. That takes all the default
> options, notably the real
> power in 'fieldmatch', which is 'combmatch=sc'.
>
>
> _______________________________________________
> ffmpeg-user mailing list
> ffmpeg-user@ffmpeg.org
> https://ffmpeg.org/mailman/listinfo/ffmpeg-user
>
> To unsubscribe, visit link above, or email
> ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
>
_______________________________________________
ffmpeg-user mailing list
ffmpeg-user@ffmpeg.org
https://ffmpeg.org/mailman/listinfo/ffmpeg-user
To unsubscribe, visit link above, or email
ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
