ioctl(VIDIOC_STREAMON): Invalid argument

[ScruffySoft]

Hi

I'm running a Raspberry Pi 4 under Raspbian OS Buster (fully updated) and running a native Pi camera (V2)

PyLivestream produces the command:

ffmpeg -loglevel error -y -f v4l2 -i /dev/video0 -f pulse -i n -codec:v libx264 -pix_fmt yuv420p -preset ultrafast -b:v 2500k -g 60 -codec:a aac -b:a 128k -ar 44100 -maxrate 2500k -bufsize 1250k -strict experimental -f flv -t 5000 rtmps://live-api-s.facebook.com:443/rtmp/

which results in the error:

[video4linux2,v4l2 @ 0x39d5630] ioctl(VIDIOC_STREAMON): Invalid argument
/dev/video0: Invalid argument

my ini file contains:
[DEFAULT]
screencap_origin: 500,150
screencap_res: 1280x720
screencap_fps: 25
webcam_res: 1280x720
webcam_fps: 30
audiofs: 44100
keyframe_sec: 2
audio_bps: 128k
preset: ultrafast
exe: ffmpeg
ffprobe_exe: ffprobe
timelimit:

[linux]
webcamchan: /dev/video0
screenchan: :0.0
audiochan: n
vcap: x11grab
acap: pulse
hcam: v4l2

[facebook]
server: rtmps://live-api-s.facebook.com:443/rtmp/
key: ~/facebook.key

I have tried all sorts - including compiling everything from the latest releases (even ffmpeg.) This seems to be a hard fault and I have no idea what causes it or how to fix it.

[scivision]

Not sure, sounds like a system issue maybe not having /dev/video0 setup? Maybe try the Linux section of https://trac.ffmpeg.org/wiki/Capture/Webcam