[FFmpeg-user] Double decimate and frame rate conversion questions

[Laine]

On Jun 1, 2024, at 2:49 PM, Mark Filipak <markfilipak.imdb at gmail.com> wrote:
> 
> Oops. I wrote foo...
> "1-1-1-3" was "2-2-2-4"
> 
> On 01/06/2024 15.39, Laine wrote:
>> I'm trying to convert 30 fps videos to 24 fps. I've been playing with a lot of methods for removing what I think may be known as lag spikes, spurious duplicate frames which fall outside the usual pattern of 4 unique frames and 1 duplicate of the 4th.
> 
> Hi, Laine,
> 
> A 1-1-1-2 frame pull-down (which produces a 1-2-3-4-4 frame pattern) is very, very rare. Are you sure? Are you sure it's not telecine (i.e., 2-3 field pull-down)?
> 
> --Mark.
> 

Thanks, Mark.

Pretty sure it's 1-2-3-4-4. I can't see any combing or interlacing, 4 and 5 seem completely identical to me. Dropping the 5th is all it needs except for every few minutes when a dup out of sequence appears. That's why I'm using "decimate=cycle=5" and "-r 24". I was executing pullup before and it was leaving more dups. The output from "decimate=cycle=5" looks spectacular except for those occasional duplicate lags. Even at 24 fps, they go by fast, but they're still noticeable.

L. Lee