update webcam stuff

README.md

@@ -19,6 +19,9 @@ v4l2-ctl -d /dev/video2 --set-fmt-video=width=1920,height=1080,pixelformat=H264
 and this will record it with zero latency:
 mpv av://v4l2:/dev/video2 --profile=low-latency --untimed
 
+this works on framework laptops: (not sure why, but setting MJPG with v4l2-ctl doesnt make mpv pick 1920x1080 by default...)
+mpv --demuxer-lavf-o=video_size=1920x1080,input_format=mjpeg av://v4l2:/dev/video0 --profile=low-latency --untimed
+
 ## fprintd
 firstly, enroll with
  - fprintd-enroll