[FFmpeg-user] Same number of frames dropped and duplicated; What does that mean?

[Paul B Mahol]

On Sun, Oct 29, 2023 at 7:32 PM Ulf Zibis <Ulf.Zibis at cosoco.de> wrote:

>
> Am 29.10.23 um 18:53 schrieb Paul B Mahol:
> > On Sun, Oct 29, 2023 at 6:08 PM Ulf Zibis<Ulf.Zibis at cosoco.de>  wrote:
> >
> >> Am 29.10.23 um 17:04 schrieb Paul B Mahol:
> > https://ffmpeg.org/ffmpeg-filters.html#toc-vfrdet
> >
> > At end it will output number of frames detected as having variable delta
> > pts, and ones with constant delta pts. If there was frames with variable
> > delta, than it will also show min, max and average delta encountered.
> Yes I understand, but in which unit the delta is measured, is it nano
> seconds or what?
> In your linked document this is not mentioned.
>

delta PTS is PTS difference, so unit is rational from stream timebase.

Nobody sane uses nano seconds.


>
> > You can increase output framerate  for constant frame rate video until
> > errors about dropped frames disappear. Or save it to container that
> support
> > variable frame rate.
>
> Does this mean to use "-fps_mode passthrough"?
>
> As a first try, I have used "-fps_mode drop".
> This resulted in a video with 1110244 fps instead 25.
> Weird !
>
> > Could also inspect those frames and see if they have any real info and
> are
> > not dupes of some other frames, either manually or using some filters.
>
> Good idea !
>
> -Ulf
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