Artefacts after exporting 4K video from DJI Mavic 2

[Maksim Kornakov]

I shoot at 4k on my drone, when I watch my clip right after the drone it is perfect, it has no artefacts, everything is sharp and nice, but when I wanted to colour grade my footage and then export it, I notice some blurry squares in the middle. I tried to cancel the colour grade and just put the video on the timeline and then export in without any changes but is had these artefacts as well. (Images below).

You can see these blurry squares around the man on the bike.

I tried maximizing bitrate, maximum render quality. Nothing helped. It also happens in some frames only, so it is possible to have 00:06:24 clear and sharp and 00:06:25 with artefacts. (Images below)

You can see 3 images, two coloured and 1 raw (D-LINK), on the raw image there are no artefacts and it is sharp, on the frame 24 of the coloured footage, there are no artefacts as well, but then (frame 25) you can see a lot of artefacts rounded in red.

[Andy 1968]

If it is 4K try at least 100 mbps for the compression.

[Maksim Kornakov]

tried that, same artefacts

[Maksim Kornakov]

[basil1891]

Try to turn off hw-acceleration for encoding/decoding. If not help, you'll need to use external encoder like x265/x264. 

[Ann Bens]

Also turn off max render if you have a dedicated gpu.

But in all honesty the original image is not that sharp it has compression artifacts too; motion blur.

[Maksim Kornakov]

You can see the screenshot of the original clip, there are no that big artefacts on it. And what do you mean "Also turn off max render if you have a dedicated GPU"?

[R Neil Haugen]

If you are not resizing the media, "Max Render Quality" is of no use, and can actually cause artifacts at times. So unlesss you are 1) resizing media (zooming in or out for instance) AND 2) seeing "jaggies" on diagonal lines, do not use Max Render Q.

Neil

[Ann Bens]

there are no that big artefacts on it.

Little ones become big ones after export.