Re: [linux-uvc-devel] 090c:337b (Silicon Motion) Camera Support?

[B. B. <be...@ek...>]

Hello again,

I tinkered a little more and played with qv4l2. All the controls seem to
work and the device gets polled, I can see the green light turn on. As
far as the uvc / v4l2 interface goes it seems to be working except qv4l2
shows no video, just a black frame(s?) at the requested resolution.

I've attached the dmesg output with
/sys/module/uvcvideo/parameters/trace = 0xffff

How do I check if this is not a fully UVC compatible camera? The test on
http://www.ideasonboard.org/uvc/faq/ shows:

$ lsusb -d 090c:337b -v | grep "14 Video"
      bFunctionClass         14 Video
      bInterfaceClass        14 Video
      bInterfaceClass        14 Video
      bInterfaceClass        14 Video
      bInterfaceClass        14 Video
      bInterfaceClass        14 Video
      bInterfaceClass        14 Video

I just need to know if this is just incompatible and I need to buy
another camera module.

Thank you,
B. Bogart

On 2019-08-04 9:32 a.m., B. Bogart wrote:
> Hello all,
> 
> I've been unable to make this camera work and wonder if it is not
> supported. I bought it thinking it would work out of the box being an
> OV2640 chip and UVC compliant.
> 
> $ lsusb
> Bus 001 Device 010: ID 090c:337b Silicon Motion, Inc. - Taiwan (formerly
> Feiya Technology Corp.) Silicon Motion Camera
> 
> $ lsusb -d 090c:337b -v > usblog.txt
> (see usblog.txt attached)
> 
> $ lsmod | grep uvc
> uvcvideo               86016  2
> videobuf2_vmalloc      16384  3 uvcvideo
> videobuf2_v4l2         24576  1 uvcvideo
> videobuf2_core         40960  2 videobuf2_v4l2,uvcvideo
> videodev              184320  5 videobuf2_core,videobuf2_v4l2,uvcvideo
> media                  40960  2 videodev,uvcvideo
> 
> $ echo 0xffff > /sys/module/uvcvideo/parameters/trace
> (see kern.txt attached)
> 
> $ uname -a
> Linux domi 4.15.0-55-generic #60-Ubuntu SMP Tue Jul 2 18:22:20 UTC 2019
> x86_64 x86_64 x86_64 GNU/Linux
> 
> $ lsb_release -a
> No LSB modules are available.
> Distributor ID:	Ubuntu
> Description:	Ubuntu 18.04.2 LTS
> Release:	18.04
> Codename:	bionic
> 
> *The closest I've come to make it work is with this command, which shows
> a window of the right size, but its all green and garbled (see attached).*
> 
> $ mplayer tv:// -tv driver=v4l2:width=640:height=480:device=/dev/video1
> -vf screenshot -vo xv
> MPlayer 1.3.0 (Debian), built with gcc-7 (C) 2000-2016 MPlayer Team
> do_connect: could not connect to socket
> connect: No such file or directory
> Failed to open LIRC support. You will not be able to use your remote
> control.
> 
> Playing tv://.
> TV file format detected.
> Selected driver: v4l2
>  name: Video 4 Linux 2 input
>  author: Martin Olschewski <ols...@zp...>
>  comment: first try, more to come ;-)
> v4l2: your device driver does not support VIDIOC_G_STD ioctl,
> VIDIOC_G_PARM was used instead.
> Selected device: PC Cam
>  Capabilities:  video capture  streaming
>  supported norms:
>  inputs: 0 = Camera 1;
>  Current input: 0
>  Current format: YUYV
> tv.c: norm_from_string(pal): Bogus norm parameter, setting default.
> v4l2: ioctl enum norm failed: Inappropriate ioctl for device
> Error: Cannot set norm!
> Selected input hasn't got a tuner!
> v4l2: ioctl set mute failed: Invalid argument
> ==========================================================================
> Opening video decoder: [raw] RAW Uncompressed Video
> Could not find matching colorspace - retrying with -vf scale...
> Opening video filter: [scale]
> Movie-Aspect is undefined - no prescaling applied.
> [swscaler @ 0x55b224369a00] bicubic scaler, from yuyv422 to yuv420p
> using MMXEXT
> [swscaler @ 0x55b224369a00] using unscaled yuyv422 -> yuv420p special
> converter
> VO: [xv] 640x480 => 640x480 Planar YV12
> Selected video codec: [rawyuy2] vfm: raw (RAW YUY2)
> ==========================================================================
> Audio: no sound
> Starting playback...
> v4l2: select timeout
> 
> *I can also sort-of make it work with gstreamer, but rather than green I
> get a window whose content never updates:*
> 
> $ gst-launch-1.0 --gst-debug-level=4 v4l2src device=/dev/video1 !
> video/x-raw,width=640,height=480,framerate=30/1 ! videoconvert !
> autovideosink
> (see gst.txt attached)
> 
> In both the mplayer and gst cases, the LED on the camera does turn on.
> 
> Thank you,
> Ben
> 
>