Aarch64 10bit output is completely broken
I am checking 10-bit samples in my android device and playback is completely broken. The screen is green all the way through. However, 8-bit samples are working just fine. You can check that with latest Firefox on an Android device (you have to enable 2 prefs).
Please note enabling dav1d (or to be more precise av1) on android is not a priority for Firefox.