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#1 2019-10-10 18:05:39

atomikegg
Member
Registered: 2019-08-14
Posts: 99

Webcam Detected by V4L2 Util, but motion Gives Error

On pure arch.

Sorry if this a QGN, TGN, TLN, etc

Qt V4L2 test utility finds my webcam no prob, and reports the following:

Device
/dev/video0 (wrapped)
Card
USB Camera (093a:2620)
Driver
gspca_pac7302
Bus
usb-0000:00:1d.1-1

However, motion reports:

[1:ml1] [NTC] [ALL] motion_init: Camera 0 started: motion detection Enabled
[1:ml1] [NTC] [VID] vid_start: Opening V4L2 device
[1:ml1] [NTC] [VID] v4l2_device_open: Using videodevice /dev/video0 and input -1
[1:ml1] [NTC] [VID] v4l2_device_capability: - VIDEO_CAPTURE
[1:ml1] [NTC] [VID] v4l2_device_capability: - READWRITE
[1:ml1] [NTC] [VID] v4l2_device_capability: - STREAMING
[1:ml1] [NTC] [VID] v4l2_input_select: Name = "gspca_pac7302"- CAMERA
[1:ml1] [NTC] [VID] v4l2_norm_select: Device does not support specifying PAL/NTSC norm
[1:ml1] [NTC] [VID] v4l2_pixfmt_select: Configuration palette index 17 (YU12) for 640x480 doesn't work.
[1:ml1] [NTC] [VID] v4l2_pixfmt_select: Supported palettes:
[1:ml1] [NTC] [VID] v4l2_pixfmt_select: (0) PJPG (GSPCA PJPG)
[1:ml1] [NTC] [VID] v4l2_pixfmt_set: Testing palette PJPG (640x480)
[1:ml1] [NTC] [VID] v4l2_pixfmt_set: Using palette PJPG (640x480)
[1:ml1] [NTC] [VID] v4l2_pixfmt_select: Selected palette PJPG
[1:ml1] [NTC] [ALL] image_ring_resize: Resizing pre_capture buffer to 1 items
[1:ml1] [ERR] [ALL] jpgutl_error_exit: Quantization table 0x00 was not defined
[1:ml1] [CRT] [VID] vid_mjpegtoyuv420p: Corrupt image ... continue

How to fix?

Thx

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#2 2019-12-08 02:07:20

atomikegg
Member
Registered: 2019-08-14
Posts: 99

Re: Webcam Detected by V4L2 Util, but motion Gives Error

i resolved this by rolling my own motion detector, using v4l2 test bench, scrot, and graphicsmagick.
instead of motion, i run v4l2 capture, take a screenshot every few seconds, and compare to the previous screenshot.
   
i can share the script here if anyone wants, but the forum rules say not to post how-to's.

Technically, i guess i can't mark this thread "Solved", since my fix is a workaround.

thx

Last edited by atomikegg (2019-12-08 02:08:40)

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