Hey guys,

I'm using Kdenlive (Version 16.11.90) on openSUSE Tumbleweed.

I'd like to cut some 4K Video Clips. I've chosen the "4K UHD 2160 30 fps" Video-Profile in Kdenlive.

If I try to import and play some 4K Video Clips in the Preview Window(MP4 Format) Kdenlive plays these clips but they are always stuttering as hell. If I choose a Video-Profile like 1080p oder 720p everything works fine.

I'm using an IBM Thinkpad Notebook with 16 GBs of RAM and a Intel Core i7 Quadcore CPU. Playing those clips in VLC or Dragon Player is no problem. Everything's smooth there.

Thanks for your support.

Regards,
mazzo

realtime playback of 4k could still be too much to handle for your laptop in terms of cpu load etc.. did you check your system monitor, what does it say? on my machine it is usually the case that vlc player can still handle playback while NLE like kdenlive or others starts to stutter already...

Hey Kalimerox,

thank you for your reply.

Here's a screenshot of KSystemMonitor while playing an 4K-Video-Clip in Kdenlive Video-Preview:


It seems 1 CPU-Core is always working at 100%. The CPU should be really strong enough to edit 4K Video. It is an Intel Core i7 6820HQ Quad-Core (no ULV) with 2.7 GHz.

Same stuttering appears when I use OpenShot instead of Kdenlive.

Using OpenShot or Adobe Premiere Pro on Windows 10 works fine.

Regards,
mazzo

For the moment proxy files will be your friend.

If I can ask, capslock, I see you making a lot of recommendations for proxy files as a solution to problems with monitor performance. Do you know what happened to the option of just dropping frames? Did the developers just remove it altogether? It seems to be completely removed from the software, and that was a perfectly serviceable low-impact solution that worked fine for years.

Your question is welcome. But I am sorry - I have no idea what happened to frame dropping. Proxy files are the only answer to stuttering playback issues I know, that is why I promote them often.