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

Nicholas Robbins nickrobbins at yahoo.com
Wed May 7 17:27:32 CEST 2014

> On Wednesday, May 7, 2014 9:12 AM, Steve Boyer <steveboyer85 at gmail.com> wrote:

> I really should have provided a larger sample -- I can do that tonight
> if you would like me to tonight (I'm at work and that box is powered
> off ATM). Looking back at the sample.vob, it is entirely telecined.
> With this particular series, they recorded on film and did editing and
> special effects in NTSC, which lead to some weird frame-rate mixing.
> This particular sample didn't include any of the funny mixing of the
> two.
> I encoded last night using:
> -vf fieldmatch,yadif=deint=interlaced
> and left the resulting video playing at the original framerate of
> 30000/1001. It stays in sync throughout the entire episode, and it
> looked like all frames were all de-interlaced.
> Steve

That might work, but I bet the formerly telecined sections now have judder. If the original film had frames ABCDEFGHI... at 24fps you are now watching ABCDDEFGHHI... at 30fps. You might not notice it at first, but eventually you will notice it. Especially if something is moving smoothly in the background.


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