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Shihab Khan avatar Ubuntu

gphoto2 movie capture error: no Viewfinder mode for Canon EOS 400D Rebel XTi

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Shihab Khan

I recently got an Canon EOS 400D to use as a webcam for recording videos. I checked gphoto2 documentation to make sure that it can work as a webcam. The documentation says "Yes" for the Liveview/webcam column for 400D:

enter image description here

I used THIS YouTube tutorial to set it up and run it as a webcam. Things I did:

  1. Install gphoto2, v4l2loopback-utils, and ffmpeg
  2. Unload v4l2loopback using: sudo rmmod v4l2loopback
  3. Activate v4l2loopback using: sudo modprobe v4l2loopback exclusive_caps=1 max_buffers=2
  4. Stream camera: gphoto2 --stdout --capture-movie | ffmpeg -i - -vcodec rawvideo -pix_fmt yuv420p -threads 0 -f v4l2 /dev/video2

However, I keep running into an error with gphoto2 --stdout --capture-movie

Capturing preview frames as movie to 'stdout'. Press Ctrl-C to abort.

*** Error ***

An error occurred in the io-library ('Could not claim the USB device'): Could not claim interface 0 (Device or resource busy). Make sure no other program (gvfs-gphoto2-volume-monitor) or kernel module (such as sdc2xx, stv680, spca50x) is using the device and you have read/write access to the device.

ERROR: Movie capture error... Exiting. Movie capture finished (0 frames)

I don't understand. Have I read the documentation wrong and there's no way 400D can work as a webcam? or am I missing something?

I'm using:

gphoto2 2.5.27
libgphoto2 2.5.27
libgphoto2_port 0.12.0
Ubuntu 22.04.1 LTS x86_64 on wayland
Kernel: 5.15.0-56-generic
CPU: Intel i7-8565U (8) @ 4.600GHz
GPU: Intel WhiskeyLake-U GT2 [UHD Gr
GPU: AMD ATI Radeon 540/540X/550/550

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