Ended up editing using Kdenlive...
My hardware: Windows 10 64bit / 8 Gb RAM / **NVIDIA GeFORCE GTX1030 / AMD Ryzen 3 1300x Quad Core 3.5Ghz
** NOTE the GTX1030 has 2Gb of GDDR5 RAM - NOT DDR4 as fitted in some GTX1030 cards. Also my GPU was released in 2017.
Hitfilm Express version 2021.1 16.1.11208.7204
Originally I built the above spec PC to edit 1080p video for YouTube.
So, yesterday I sat down to edit some footage which had been shot on a Mavic Mini drone, at 2.7k 30fps. This footage is then re-rendered via an application call 'Handbrake' to 1080p 30fps with the settings at: 30 fps constant framerate, constant quality of 20 and Codec H.264.
The clips I imported into Hitfilm all playback fine in the Viewer until I edit them....
When I cut a clip using either the razorblade on the timeline or trimmer, there is a problem when you playback this edited clip in the Viewer. The new clip seems to 'stall' for the first few seconds, skipping frames really badly, then returns to normal playback. I have tried all playback settings in the viewer and had no luck. I also tried changing my project settings to 720p 30fps and the same thing happened.
So I tried the same clips & process in Davinci Resolve 14, free version, and the SAME thing happened.
I've never had a problem editing 1080p footage before, So I thought the problem lay with re-rendering footage from 2.7k to 1080p. So I tried different setting in Handbrake, but this made no difference.
Eventually I tried Kdenlive, with 1080p clips (30fps with the settings at: 30 fps constant framerate, constant quality of 20 and Codec H.264.) and there where no problems at all with playback after making an edit, even with clip & project monitoring set to 1:1, the same resolution as the clip.
Has anybody experienced anything similar, or is there something I've missed?