gst-launch-1.0 filesrc location=videos/fin.mkv ! decodebin name=demux ! videocrop top=400 left=550 right=650 bottom=200 ! x264enc bitrate=2000 ! mpegtsmux ! filesink location=test.mkv
sudo apt install v4l2loopback-dkms sudo modprobe v4l2loopback exclusive_caps=0 gphoto2 --capture-movie --stdout | gst-launch-0.10 fdsrc ! decodebin2 name=dec ! queue ! ffmpegcolorspace ! v4l2sink device=/dev/video1