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android dev here.

afaik newer device kernels in android implements f_uvc function for it's usb gadget interface but i'm not sure you can use this without root. so, apps can't create this functionality without root.

also i'm not sure it's works even apps can get root. i didn't tried yet because my phone not support f_uvc and released kernel sources sucks.

src: https://android.googlesource.com/kernel/msm/+/android-5.0.2_...

and that's relevant how?

scrcpy + an app like opencamera works great for me

That's great for monitoring & setting up shots but still doesn't show up as a native device. What I usually do is hook a stream upto OBS or join via video on the phone & stay muted+silent on my laptop.

>still doesn't show up as a native device

Yeah it does. You send it to a v4l2 loopback (scrcpy --v4l2-sink) and then it shows up in stuff like Firefox or chrome as a webcam.

Oh nice, will try it out with a clean camera feed probably from some WebRTC sample page.