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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