ffmpeg show devices
ffplay.exe -list_devices true -f dshow -i dummy Mirror screen from webcam (change 'Integrated Webcam' to your camera listed from above command'): ffplay -f dshow -i video="Integrated Webcam" -vf "crop=iw/2:ih:0:0,split[left][tmp];[tmp]hflip[right];[left][right] hstack" |