更新 Fedora 后，v4l2loopback 不再工作

Question

从 Fedora 33 升级到 Fedora 34 后，v4l2loopback 似乎不再工作了。我确实安装了 v4l2loopback-dkms

https://copr.fedorainfracloud.org/coprs/sentry/v4l2loopback/

并重新启动，但问题仍然存在。

现在，我有以下内容：

$ v4l2-ctl --all
Driver Info:
    Driver name      : v4l2 loopback
    Card type        : OBS Virtual Camera
    Bus info         : platform:v4l2loopback-000
    Driver version   : 5.11.16
    Capabilities     : 0x85208002
        Video Output
        Video Memory-to-Memory
        Read/Write
        Streaming
        Extended Pix Format
        Device Capabilities
    Device Caps      : 0x05208002
        Video Output
        Video Memory-to-Memory
        Read/Write
        Streaming
        Extended Pix Format
Priority: 0
Video output: 0 (loopback in)
Format Video Output:
    Width/Height      : 0/0
    Pixel Format      : 'BGR4' (32-bit BGRA/X 8-8-8-8)
    Field             : None
    Bytes per Line    : 0
    Size Image        : 0
    Colorspace        : sRGB
    Transfer Function : Default (maps to sRGB)
    YCbCr/HSV Encoding: Default (maps to ITU-R 601)
    Quantization      : Default (maps to Full Range)
    Flags             : 
Streaming Parameters Video Capture:
    Frames per second: 30.000 (30/1)
    Read buffers     : 2
Streaming Parameters Video Output:
    Frames per second: 30.000 (30/1)
    Write buffers    : 2

User Controls

                    keep_format 0x0098f900 (bool)   : default=0 value=0
              sustain_framerate 0x0098f901 (bool)   : default=0 value=0
                        timeout 0x0098f902 (int)    : min=0 max=100000 step=1 default=0 value=0
               timeout_image_io 0x0098f903 (bool)   : default=0 value=0
$ 

但是，OBS-Studio 上没有显示我的相机的视频。

有任何想法吗？