[Motion-user] motion fails until you run vlc

[tosiara <to...@gm...>]

Hi,

I'm having strange issue when motion fails with error:

Video device fatal error - Closing video device
Closing video device /dev/video0

Since that motion fails to open camera even if I kill it and start again. I
get this infinite sequence:

root@mk808:/root# motion -c motion.conf -n
[0] Processing thread 0 - config file motion.conf
[0] Motion 3.2.12 Started
[0] ffmpeg LIBAVCODEC_BUILD 3482368 LIBAVFORMAT_BUILD 3478784
[0] Thread 1 is from motion.conf
[1] Thread 1 started
[0] motion-httpd/3.2.12 running, accepting connections
[1] cap.driver: "uvcvideo"
[1] cap.card: "UVC Camera (046d:080a)"
[1] cap.bus_info: "usb-usb20_host-1"
[1] cap.capabilities=0x04000001
[1] - VIDEO_CAPTURE
[1] - STREAMING
[0] motion-httpd: waiting for data on port TCP 8080
[1] Config palette index 2 (MJPG) doesn't work.
[1] Supported palettes:
[1] 0: YUYV (YUV 4:2:2 (YUYV))
[1] 1: MJPG (MJPEG)
[1] Selected palette YUYV
[1] VIDIOC_TRY_FMT failed for format YUYV: Input/output error
[1] Unable to find a compatible palette format.
[1] ioctl (VIDIOCGCAP): Invalid argument
[1] Could not fetch initial image from camera
[1] Motion continues using width and height from config file(s)
[1] Resizing pre_capture buffer to 1 items
[1] Started stream webcam server in port 8081
[1] Resizing pre_capture buffer to 5 items
[1] Retrying until successful connection with camera
[1] cap.driver: "uvcvideo"
[1] cap.card: "UVC Camera (046d:080a)"
[1] cap.bus_info: "usb-usb20_host-1"
[1] cap.capabilities=0x04000001
[1] - VIDEO_CAPTURE
[1] - STREAMING
[1] Config palette index 2 (MJPG) doesn't work.
[1] Supported palettes:
[1] 0: YUYV (YUV 4:2:2 (YUYV))
[1] 1: MJPG (MJPEG)
[1] Selected palette YUYV
[1] VIDIOC_TRY_FMT failed for format YUYV: Input/output error
[1] Unable to find a compatible palette format.
[1] ioctl (VIDIOCGCAP): Invalid argument
[1] Retrying until successful connection with camera
[1] cap.driver: "uvcvideo"
[1] cap.card: "UVC Camera (046d:080a)"
[1] cap.bus_info: "usb-usb20_host-1"
[1] cap.capabilities=0x04000001
[1] - VIDEO_CAPTURE
[1] - STREAMING

There is workaround to unplug and replug the camera. But I can't do this
remotely.
I noticed, if I run VLC and capture some frames from the camera - after
that I again can use motion - it starts without any issues.

Some time ago I have posted this to SupportRequest of Kenneth Lavrsen home
page, but did not receive any suggestion:
http://www.lavrsen.dk/foswiki/bin/view/Motion/SupportQuestion2012x01x28x093058
This happens on both x86 PC and ARM stick MK808 using same camera -
Logitech C905

So anybody knows why motion fails and why VLC is able to fix it?


Thanks