Ubuntu Issue with Virtualcam, video is jammed

[Oliv]

Hello, I'm new to OBS, I managed to get my canon EOS video source in OBS, the image looks great but when I click on "Start Virtual Camera" the image becomes purplish/jammed and is not usable. When I stop the virtual cam the picture quality returns to normal.

I'm on Ubuntu 20.04.1 LTS
This is how I launch the video : gphoto2 --stdout --capture-movie | ffmpeg -i - -vcodec rawvideo -pix_fmt yuv420p -threads 0 -f v4l2 /dev/video0

Here is the log file info:
12:38:52 PM.816: Virtual camera started
12:38:52 PM.817: ==== Virtual Camera Start ==========================================
12:38:54 PM.874: Output 'virtualcam_output': stopping
12:38:54 PM.874: Output 'virtualcam_output': Total frames output: 60
12:38:54 PM.874: Output 'virtualcam_output': Total drawn frames: 62
12:38:54 PM.874: ==== Virtual Camera Stop ===========================================
12:38:54 PM.875: Virtual camera stopped
12:44:13 PM.669: Virtual camera started
12:44:13 PM.670: ==== Virtual Camera Start ==========================================
12:44:36 PM.094: Output 'virtualcam_output': stopping
12:44:36 PM.094: Output 'virtualcam_output': Total frames output: 671
12:44:36 PM.094: Output 'virtualcam_output': Total drawn frames: 672
12:44:36 PM.094: ==== Virtual Camera Stop ===========================================
12:44:36 PM.095: Virtual camera stopped
12:45:16 PM.040: Virtual camera started
12:45:16 PM.041: ==== Virtual Camera Start ==========================================
12:47:57 PM.035: Output 'virtualcam_output': stopping
12:47:57 PM.035: Output 'virtualcam_output': Total frames output: 4828
12:47:57 PM.035: Output 'virtualcam_output': Total drawn frames: 4829
12:47:57 PM.035: ==== Virtual Camera Stop ===========================================
12:47:57 PM.036: Virtual camera stopped



Thanks for your help.