I have this same issue playing x265 1080p 8-10bit content.
if I drop the res of my 1080p files by half it disappears.
if I change the codec from x265 to x264 it also fixes the problem.
I have only seen the problem with NTSC. but have 4k NTSC that work fine...
I have a pal 1080p 10bit video with much higher bitrates which does not suffer the same artifacts.
I have this same issue playing x265 1080p/4k 8-10bit content.
if I drop the res of the file by half it disappears.
if I change the codec from x265 to x264 it also fixes the problem.
I have only seen the problem with NTSC. but have 4k NTSC that work fine...
I have a pal 1080p 10bit video with much higher bitrates which does not suffer the same artifacts.
I don't think a 10 second clip will be a problem.
I made a 10-20 second clip and it still suffered the same artifact problem
Im running a Raspberry Pi 4 Model B 4GB
