[FFmpeg-user] Decimation with ppsrc=1 malfunctions

[Paul B Mahol]

On Sun, Dec 27, 2020 at 7:56 PM pdr0 <pdr0 at shaw.ca> wrote:

> pdr0 wrote
> > I don't know if it's the full explanation...
> >
> > The way it should work is ppsrc should disable everything else , given if
> > input src ,and ppsrc have the exact same timecodes
> >
> >
> > In theory, you should get same as -vf decimate on preprocessed.mkv
> >
> > ffmpeg -i preprocessed.mkv -vf decimate -c:v libx264 -crf 18 -an
> > preprodec.mkv
> >
> > gives drops at - 1019,1024,1029...
> >
> >
> >
> > The interval is different and there are 2 more frames , 138 vs. 136
>
> ffmpeg -i preprocessed.mkv -vf decimate=scthresh=0 -c:v libx264 -crf 18 -an
> preprodec2.mkv -y
>
> gives 138 frames when run alone, but 136 frames when run with 2 inputs and
> ppsrc=1 .
>
> It's still unexpected behaviour
>

Should be fixed.


>
>
>
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