[FFmpeg-user] FFMpeg problem using fieldmatch and decimate filters to IVTC

[Carl Eugen Hoyos]

Steve Boyer <steveboyer85 <at> gmail.com> writes:

> ffmpeg -i 4.18 -map 0:1 -map 0:3 

> -vf crop=704:480:10:0 -vf fieldmatch,decimate

I always wonder if this is supposed to work (it 
apparently works, but I don't think you can protest 
if it breaks in the future), please only use one 
video filter chain per output file.

Just in case the following is not clear:

> -vf fieldmatch

The fieldmatch filter is not supposed to work on 
its own, it can only function followed by the 
decimate filter.

> -vf yadif

The yadif filter damages telecined streams (that 
by definition can be restored) permanently, don't 
use it unless you know that your source is 
actually interlaced (and not telecined).

> -vf pullup,fps=24000/1001

This unfortunately does not work;-(
(This is documented iirc.)

> -vf pullup -r 24000/1001

As said, this works fine here for the sample you 
uploaded.

Carl Eugen