HyperForum — /dev/video

Re: /dev/video

null@example.com (throgh) — Thu, 09 Jan 2025 22:07:54 +0000

Yes, a bit strange. But the enumeration of the device-tree is recognized over the next startup so it could have surely an impact throughout the older and newer BIOS-rom.

So the older rom may have granted better access while the newer rom had no further influence after that and the device-tree kept working.

Re: /dev/video

null@example.com (gnu) — Thu, 09 Jan 2025 21:59:34 +0000

I tried an old BIOS and the camera started working, I reinstalled the new BIOS and now it works...computer witchcraft.

Re: /dev/video

null@example.com (throgh) — Thu, 09 Jan 2025 21:29:20 +0000

Works so far flawless for me: Thinkpad T440p with own compiled Coreboot. When there is no device like:

/dev/video0 and /dev/video1 it seems to me that the integrated webcam maybe not connected or recognized.

Re: /dev/video

null@example.com (gnu) — Thu, 09 Jan 2025 21:23:43 +0000

HARDWARE = Lenovo X200 [canoeboot_20250107]
SOFTWARE = I just wanted to test the integrated webcam with the command:

ffmpeg -f v4l2 -video_size 640x480 -i /dev/video0 -vf "format=yuv420p" -f sdl "Webcam Feed"

Re: /dev/video

null@example.com (throgh) — Thu, 09 Jan 2025 20:56:00 +0000

You need to add further information: What kind of hardware is that - integrated or external connected webcamera (USB-device)? What kind of usecase? Furthermore with what kind of software?

/dev/video

null@example.com (gnu) — Thu, 09 Jan 2025 18:53:29 +0000

/dev/video* does not exist, I can't turn on the webcam, any suggestions?