I am having this greenish tone in playing video and in camera app. In gsi android 12 it is good and no problem. Above than 12, all the gsi having this problem. Is there any solution?
It is a known issue with Unisoc devices that came in originally with A11 or 12. It is a codec issue. Afaik, there's a magisk module that fixes this called "fix_ffmpeg_codecs" but I can't seem to find it now. Asides from that, the only way to fix this is by using only A12 GSIs.
