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@juanpc2018
seems related to codec, maybe VP9, video resolution, and thumbnail or b-frame keys because lines glitch are from 0:00, and there is No image at 0:00
file:///Screenshot_20231225_185909.jpg
https://www.youtube.com/watch?v=rdccTOcX7o4
this is the worse case, all videos are different.
There is No Glitch in small PIP window. mode.
@juanpc2018 im using 4K TV at 1080 FullHD Native resolution,
because text is hard to see at 4K without Scaling, and i dont like Overscaling 200% 300% on a weak machine 8GB Ram, integrated graphics, etc....
but probably 1080 played at 4K would be similar setting,
and 4k played at 4k, setting 4 could be too much, probably 3.
maybe a setting for each resollution is too much,
but in pairs, seem ok:
240 ... 360 | 480 .. 720 | 1080 .. 1440 | 2160 .. 4320
latest mesa driver minimized the problem, but still there, specially in some Ads on YT.
or Reloading the same video.
VDPAU-GL drivers are required to have Video acceleration with Integrated-Intel Graphics, tested 4th gen, 11th gen.
without video acceleration, CPU load goes between 60%-90% playing a 1080 video with an i3 CPU.
video glitch also happened in OSX Catalina 10.15.7