and you’re absolutely sure the files are av1? if you try to open the video files with ffmpeg, eg: ffmpeg -i videofile.mkv
, what does it say the codec is?
at least my av1 videos say: Stream #0:0[0x1](und): Video: av1 (libdav1d) (Main) (av01 / 0x31307661), yuv420p(tv, progressive), 854x854, 464 kb/s, SAR 1:1 DAR 1:1, 30 fps, 30 tbr, 16k tbn (default)
while true, but you can’t buy UT or Unreal from gog anymore, the games were delisted ages ago.
You can still download them from your collection if you own them, but new purchases are not possible.