nikon_d7000_to_v4l2.sh

# Use a DSLR camera as a webcam, in Zoom and other applications.

# Inputs from https://gist.github.com/ianmackinnon/cf8a4d6cdb08852a818fc34bd4e1882f
# See # https://gstreamer.freedesktop.org/documentation/video4linux2/v4l2sink.html?gi-language=c#v4l2sink

# Install dependencies.
sudo apt install v4l2loopback-dkms gphoto2 gstreamer1.0-tools

# Load and verify module.
sudo modprobe v4l2loopback
sudo lsmod | grep v4l2loopback
#v4l2loopback           45056  0
#videodev              249856  4 videobuf2_v4l2,v4l2loopback,uvcvideo,videobuf2_common

# Grab JPEG frames from Nikon D7000 using gphoto2;
# use gstreamer to stream video to v4l2 device.
#
# Make sure to pipe through videoconvert, v4l2sink complains otherwise;
# setting sync=false seems to prevent the video getting slow after a while, due to frame drop.
#
# Specify a non-existing video device to v4l2sink;
# if specifying an existing device, gst-launch will complain about that device not being an output device.
gphoto2 --capture-movie --stdout \
  | gst-launch-1.0 -v -e fdsrc \
    ! image/jpeg,framerate='(fraction)'24/1,width=640,height=480 \
    ! jpegdec \
    ! videoconvert \
    ! v4l2sink device=/dev/video2 sync=false
    
# Now it should be possible to use the new video device /dev/video2 in Zoom and other applications.