Black screen when using camera as web cam on linux

krenix (owl from hogvarts)

I am using manjaro linux: 5.11.19-1-MANJARO

I am using the command 

`gphoto2 --stdout --capture-movie | ffmpeg -i - -vcodec rawvideo -pix_fmt yuv420p -r 60 -threads 0 -f v4l2 /dev/video0` to take video stream from my canon camera and make it available for apps. I am getting correct image in telegram and VLC but in discord i have a black screen

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  • trent w

    I'd like to second this question. I'm on x86_64 Linux 5.12.8-arch1-1 using a camera through a CamLink 4k and all I get is a black screen. Other programs like Zoom work fine. I can see Discord accessing the video device just fine-

    ┗╸❯❯❯ sudo lsof /dev/video0
    COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
    Discord 4345 user  mem CHR 81,0 459 /dev/video0
    Discord 4345 user  128u CHR 81,0 0t0 459 /dev/video0

    When I run Zoom (for example) I get similar info-

    COMMAND     PID  USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
    zoom    1338712 user   mem    CHR   81,0           459 /dev/video0
    zoom    1338712 user    93u   CHR   81,0      0t0  459 /dev/video0

    Except the video output works. Any info that could solve this issue would be appreciated.

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  • krenix (owl from hogvarts)

    trent w so i solved the issue by loading v4l2loopback (as i remeber) kernel module without the exclusive_caps parameter. See issue on github: https://github.com/umlaeute/v4l2loopback/issues/274

    so i am using the module just without that parameter. all works good)

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