# access phone's camera 
scrcpy --list-camera-sizes
scrcpy --video-source=camera
scrcpy --video-source=camera --camera-size=1280x720
scrcpy --video-source=camera --max-size=1920
scrcpy --video-source=camera --camera-facing=front|back|external
scrcpy --video-source=camera --camera-size=1920x1080 --camera-id=0
scrcpy --video-source=camera --camera-size=1920x1080 --camera-id=1

# Rotate Camera 
scrcpy --video-source=camera --camera-size=1920x1080 --camera-id=0 --capture-orientation=180

=======
# screem scrcpy as a webcam
sudo apt install v4l2loopback-dkms
sudo modprobe v4l2loopback

#if you get an error about loading the module
sudo aptitude reinstall v4l2loopback-dkms

# list video devices
v4l2-ctl --list-devices
#or 
ls /dev/video*

# you will be using the "dummy" video device
scrcpy --v4l2-sink=/dev/videoN
scrcpy --v4l2-sink=/dev/videoN --no-video-playback  # disable playback window
scrcpy --v4l2-sink=/dev/videoN --no-video-playback --list-camera-sizes
scrcpy --v4l2-sink=/dev/videoN --no-video-playback --video-source=camera
scrcpy --v4l2-sink=/dev/videoN --no-video-playback --video-source=camera --camera-size=1280x720
scrcpy --v4l2-sink=/dev/videoN --no-video-playback --video-source=camera --max-size=1920
scrcpy --v4l2-sink=/dev/videoN --no-video-playback --video-source=camera --camera-facing=front|back|external
scrcpy --v4l2-sink=/dev/videoN --no-video-playback --video-source=camera --camera-size=1920x1080 --camera-id=0
scrcpy --v4l2-sink=/dev/videoN --no-video-playback --video-source=camera --camera-size=1920x1080 --camera-id=1

#audio options
scrcpy --v4l2-sink=/dev/videoN --no-audio --video-source=camera --camera-size=1920x1080 
scrcpy --video-source=display --audio-source=mic    # force display AND microphone
scrcpy --video-source=camera --audio-source=output  # force camera AND device audio output
scrcpy --video-source=camera --no-audio --record=file.mp4

# rotate camera 
scrcpy --video-source=camera --camera-size=1920x1080 --orientation=90



# playback
ffplay -i /dev/videoN
vlc v4l2:///dev/videoN   # VLC might add some buffering delay
mpv av://v4l2:/dev/videoN 


# more info 
https://github.com/Genymobile/scrcpy/blob/master/doc/camera.md