Hi Kevin,
On 20/09/2020 18:06, Kevin Locke wrote:
> Hi all,
>
> The ThinkPad T430 includes a "Chicony Electronics Co., Ltd." "Integrated
> Camera" (04f2:b2db). The camera works well with uvcvideo, but does not
> currently appear on the Supported Devices list.[1] There are two,
> possibly related, oddities worth mentioning:
Camera's that follow the standard don't always need to be listed explicitly.
I'm glad it works for you.
> First, there are a few warnings printed when uvcvideo is loaded:
>
> uvcvideo: Found UVC 1.00 device Integrated Camera (04f2:b2db)
> uvcvideo 3-1.6:1.0: Entity type for entity Extension 4 was not initialized!
> uvcvideo 3-1.6:1.0: Entity type for entity Extension 3 was not initialized!
> uvcvideo 3-1.6:1.0: Entity type for entity Processing 2 was not initialized!
> uvcvideo 3-1.6:1.0: Entity type for entity Camera 1 was not initialized!
>
> Second, uvcvideo creates two video devices (video0 and video1):
>
> $ readlink /sys/class/video4linux/video*
> ../../devices/pci0000:00/0000:00:1a.0/usb3/3-1/3-1.6/3-1.6:1.0/video4linux/video0
> ../../devices/pci0000:00/0000:00:1a.0/usb3/3-1/3-1.6/3-1.6:1.0/video4linux/video1
>
> `mpv /dev/video0` works well. `mpv /dev/video1` fails with:
>
> [ffmpeg/demuxer] video4linux2,v4l2: ioctl(VIDIOC_G_INPUT): Inappropriate ioctl for device
>
> `v4l-info /dev/video1` shows:
>
> ### v4l2 device info [/dev/video1] ###
> general info
> VIDIOC_QUERYCAP
> driver : "uvcvideo"
> card : "Integrated Camera: Integrated C"
> bus_info : "usb-0000:00:1a.0-1.6"
> version : 5.8.7
> capabilities : 0x84a00001 [VIDEO_CAPTURE,?,?,STREAMING,(null)]
>
> standards
>
> inputs
>
> video capture
> VIDIOC_G_FMT(VIDEO_CAPTURE): Invalid argument
>
> controls
>
> I don't understand the purpose of the second device (if any). With
> tracing enabled, there are references to "entity 1" and "entity 2" in
> the kernel log. Perhaps this is expected behavior? If not, I would be
> happy to help debug further.
The second video node is for extracting metadata from the frames.
It is not expected to deliver video frames with a video capture application.
v4l-info should probably be updated to express that better, but I don't
know who maintains that tool
--
Kieran
> Thanks for all of your efforts maintaining uvcvideo!
>
> Best,
> Kevin
>
> [1]: https://www.ideasonboard.org/uvc/
>
>
> _______________________________________________
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> Lin...@li...
> https://lists.sourceforge.net/lists/listinfo/linux-uvc-devel
>
--
Regards
--
Kieran
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