I didn't see "Use Camera2 API" neither. I guess it the phone does not support it, the option doesn't show up.
Settings (Gears Icon) > ... More camera controls ... > Shutter sound (third option from the top)
BTW Simple Camera disables shutter sound for both, photo and video, but also not separately.
not all phones support this You mean, that not all Phones support "Use Camera2 API"? I guess mine does not, as I can't find that option. Here ist the debut info from my Honor 5X KIW-L21 (using LineageOS 15.1-20190428-NIGHTLY-kiwi) Open Camera v1.45.2 Code: 69 (c) 2013-2019 Mark Harman Released under the GPL v3 or later (Open Camera also uses additional third party files, see online help for full licences and attributions.) Package: net.sourceforge.opencamera Android API version: 27 Device manufacturer:...
This works for photos but not for video. Maybe turning of is not supported for this phone?