The video is a cartoon animated with duplicate frames.

Interpolation is 2x (29.97 to 59.94)

The output video properties do not show the same FPS as the interpolation setting.

The image shows the video output using Mode 3 Adaptive (Mode 4 is similar at 111 fps , Mode 1 is a little off at 59.3 fps)

How can I get the properties to match 59.94?

Thanks for your help!

at first install mediainfo to get real values of your videos

I only use mode 1 so here is my stuff about that:

if your source video for example has 1000 frames (pngs) dain can only interpolate between them

so the last frame can not be interpolated by dain

your interpolated_frames folder must contain 1999  frames

dain has the strange  habit to render in step 3 with the factor between 1999 and 1000 frames

so it renders the outputvideo with factor 1,99 and that has the result that your outputvideo has 59,3 fps

here's a solution: try to copy the last frame of "original_frames" to "interpol_frames" after step 2 (rename it of course)

so that the factor of count of pngs is exactly 2.0 between both folders

if your source has 1000 frames and your interpol folder has 2000 frames all will be right

then run step 3 and you will get 59,94 fps

EDIT: sometimes it can be that dain forgets one frames additionally  then you  must add 2 frames at the interpol-folder

And don't enable the scene detection that will delete frames too

Thanks for your help!