question: chromium v120 decode 4K

[lilulu2023]

Dear Jeffy , we have successfully built chromium with your patch. videos in chromium with 2K resolution play well but 4K still not satisfying, we noticed that with kylin attached chromium version 83 works fine with the same 4K video. So what should we do to figure out whats different between 83 and our own 120 build ? Besides, both version recognized GPU mali T860. Thank you for any help.