Support: USB Camera

[rkenzhebekov]

Can I use other cameras connected via USB with Raspberry PI 4, or is the raspberry pi based CSI Camera Module required?

Thank you

[TzuHuanTai]

Yes, you can. My Pi 4B uses a USB camera.
I suggest running v4l2-ctl -d /dev/video0 --list-formats in advance to confirm the supported formats of the USB camera. My USB camera only supports specific formats, and V4L2 can't read it if my settings don't match.

[rkenzhebekov]

Thank you!

[boredom1234]

@TzuHuanTai I am getting this error, what can I do?

Use h264 format source in v4l2
[v4l2_utils] Error: fd(16) set fps(30): Inappropriate ioctl for device

[TzuHuanTai]

Could you please check the support format of your webcam?
And what is your full command and settings right now?

Here is the way I use webcam on pi, fyi

1. Enable lagecy v4l2 driver, ref

2. Check the support format of the webcam and run it.

pi@home-pi-5:~ $ v4l2-ctl -d /dev/video0 --list-formats-ext
ioctl: VIDIOC_ENUM_FMT
        Type: Video Capture

        [0]: 'MJPG' (Motion-JPEG, compressed)
                Size: Discrete 352x288
                        Interval: Discrete 0.033s (30.000 fps)
                Size: Discrete 640x480
                        Interval: Discrete 0.033s (30.000 fps)
                Size: Discrete 800x600
                        Interval: Discrete 0.050s (20.000 fps)
                Size: Discrete 1280x720
                        Interval: Discrete 0.033s (30.000 fps)
...

pi@home-pi-5:~ $ ./pi_webrtc --device=/dev/video0 --v4l2_format=mjpeg --fps=30 --width=1920 --height=1080 --mqtt_host=xxxx --mqtt_port=8883 --mqtt_username=xxxx --mqtt_password=xxxx --uid=xxxx
Use mjpeg format source in v4l2
[v4l2_utils] Error: fd(26) set ctrl(9963810): Invalid argument
[v4l2_utils] Error: fd(26) set ext ctrl(10029519): Invalid argument

Sometime it might show some errors about v4l2 setting while running pi_webrtc.
Because not every webcam supplier implement all v4l2 setting support, and pi_webrtc always try to set bitrate/roration to the camera initially, but it doesn't bother the streaming.

[boredom1234]

It worked thanks