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umlaeute / v4l2loopback

v4l2-loopback device
GNU General Public License v2.0
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v4l2loopback-ctl add ? #551

Closed aanno closed 10 months ago

aanno commented 10 months ago

I've set up v4l2loopback 0.12.7 with dkms on fedora 38. Kernel module works, v4l2loopback-ctl is compiled.

However,

cd /usr/src/v4l2loopback-0.12.7/utils
sudo ./v4l2loopback-ctl add -n "Obs Virtual Camera" /dev/video5
Usage:
    ./v4l2loopback-ctl [command] [args]

Commands:
     set-fps <FPS> /dev/videoX  Set device fps (if format is already
                                negotiated).

     set-timeout-image <IMAGE> /dev/videoX  Set timeout on device, and 
                                            optionally the placeholder picture,
                                            instead of default null frame.

     set-caps <CAPS> /dev/videoX  Fix format for the device (using GStreamer
                                  caps), so it will be maintained until reset,
                                  regardless of future readers/writers.

Options:
    FPS      frames per second, either as integer ('30') or fraction ('50/2')
    IMAGE    image file ("no-input.png"), or 'videotestsrc'
    CAPS     GStreamer caps ("video/x-raw, format=UYVY, width=640, height=480"),
             or 'any'
    /dev/videoX  the v4l2-loopback device file you want to act on

Hence, it seems to me that v4l2loopback-ctl add is not supported. Any idea on this?

umlaeute commented 10 months ago

Sure: v4l2loopback 0.12.7 (or really 0.12.x) does not support dynamically adding or removing devices.

aanno commented 10 months ago

Dear @umlaeute,

could you please elaborate on which versions support dynamic device management?

umlaeute commented 10 months ago

No released version does. I was hoping to get a 0.13.0 version (that would support it) out this summer, but apparently this hasn't happened (yet)

pallaswept commented 8 months ago

No released version does. I was hoping to get a 0.13.0 version (that would support it) out this summer, but apparently this hasn't happened (yet)

Just popped by to report this same issue, thought I was doing it wrong. Since I'm here I wanted to take the opportunity to say thanks for this project. I'll look forward to version 0.13.0 whenever you have the chance, but it's very helpful as it is :) Thanks!