Ffmpeg-zoom-webcam

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 modprobe v4l2loopback devices=1 exclusive_caps=1
 fac=1.4
 ffmpeg -vcodec mjpeg -r 30 -s 1920x1080 -i /dev/video2 -vf "scale=$fac*iw:-1, crop=iw/$fac:ih/$fac","format=yuv420p" -f v4l2 /dev/video5

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