Greetings,

Posting this just in case it helps someone else. With kdenlive 20.04 - I imported a bunch of slow-motion videos taken with my iPhone and I was having issues with doing anything useful with them. They would load in the clip editor but they showed in clip properties as 240 fps, and if I rendered them they just came out at normal speed. Google didn't come up with anything useful on this, but through trial and error I found that using the "clip-jobs -> duplicate with speed change" I was able to adjust the slow-mo videos so that they were usable by using a speed change percent of 12.5% - 12.5 being 1/8th of 100%, given that 240 fps is 8 times faster than the standard 30 fps. The videos are now fully usable.

Maybe this was obvious or was covered in a manual somewhere that I missed - either way, I couldn't find anything useful on it and figured others may have the same issue, so decided to post. Hope this was helpful.

Thanks,

please post a slow motion video (maybe very short) somewhere to make us able to find the issue.

This is one of the videos I had an issue with. Shot on an iPhone 8 using 240 fps @ 1920x1080.

https://drive.google.com/file/d/1ODbGkogJMET1b5YChs43RSh94Tz52no0/view?usp=sharing

opened an issue about this: https://invent.kde.org/multimedia/kdenlive/-/issues/727

btw in one case i was able to slow down the video ... creating a 30fps project .. importing the 240fps clip (not changing project settings as suggested) .. and using the clip JOBS (like 2nd video on issue report) .. slowed down to 12.5% ( 240/30 rate )

and after a while the video processed was a slow motion video of the correct lenght...

BTW.. usually whe n i used slow down video.. i'm using the speedchange directly on timeline... like this video:

https://invent.kde.org/multimedia/kdenl ... 0yDjsb.mp4