I “think” you should be fine if the v4l2 and mpp library is working for you(you can do hardware decode using other software like mpv). The patched chromium is using an v4l2 mpp plugin to do the hardware decoding, for that to work you probably need libv4l installed and there should be a bunch of related debs over there, just search for ‘v4l’ in radxa repo and you will find a few. Please note that hardware decoding of AV1 and HEVC will not be supported by (this version of) chromium and a lot of youtube videos are using av1 already.