The "framerate" video filter badworking with duplicates frames in slideshow

[Alex Natalsson]

I am making a slideshow.
I connecting the photos to video with:
$ffmpeg -r 1 -pattern_type glob -i '/tmp/temp/*.jpg' 1047.JPG_slide.mp4

For smoothing change photos I try to use video filter "framerate":
$ffmpeg -threads 1 -i 1047.JPG_slide.mp4 -vf framerate='fps=30' 1047.JPG_slide_framerate.mp4

And this working almost fine.
But when I creates for increasing duration duplicate photos the smoothing translation don't working and appears sometimes only.
$ffmpeg -r 1 -pattern_type glob -i '/tmp/temp/*.jpg' 1047.JPG_with_duplicates_slide.mp4
$ffmpeg -threads 1 -i 1047.JPG_with_duplicates_slide.mp4 -vf framerate='fps=30' 1047.JPG_with_duplicates_slide_framerate.mp4

May be this is a bug?

[Elon Musk]

use -framerate 1 instead of -r 1

[Alex Natalsson]

Replying to Elon Musk:

use -framerate 1 instead of -r 1

O very big thanks for reply, but still not working after.