Motion is a program that monitors the video signal from one or more cameras and is able to detect if a significant part of the picture has changed.
The program is written in C and is made for the Linux operating system, (using the video4linux interface). Motion is a command line based tool whose output can be either jpeg, ppm fies or mpeg video sequences. Motion is strictly command line driven and can run as a daemon with a rather small footprint and do.
Motion is the perfect tool for keeping an eye on your property, keeping only those images that are interesting.
installation on ubuntu
sudo apt-get install motion
使用Motion利用USB摄像头录制视频
1.在用户目录下（~）创建.motion文件夹，将/etc/motion下的motion.conf复制到~/.motion下，并获得其修改权限。Motion读取配置文件的优先级是~/.motion/motion.conf；/etc/motion/motion.conf。监视多个摄像头则读取thread1.conf；thread2.conf，以此类推。
2.修改~/.motion/motion.conf文件，近涉及视频录制部分
# Image width (pixels). Valid range: Camera dependent, default: 352 %画面宽度
width 1280
# Image height (pixels). Valid range: Camera dependent, default: 288 %画面高度
height 720
# Maximum number of frames to be captured per second. %帧率即FPS
# Valid range: 2-100. Default: 100 (almost no limit).
framerate 25
# Output 'normal' pictures when motion is detected (default: on) %关闭图片输出
# Valid values: on, off, first, best, center
# When set to 'first', only the first picture of an event is saved.
# Picture with most motion of an event is saved when set to 'best'.
# Picture with motion nearest center of picture is saved when set to 'center'.
# Can be used as preview shot for the corresponding movie.
output_normal off
# Codec to used by ffmpeg for the video compression. %视频编码
# Timelapse mpegs are always made in mpeg1 format independent from this option.
# Supported formats are: mpeg1 (ffmpeg-0.4.8 only), mpeg4 (default), and msmpeg4.
# mpeg1 - gives you files with extension .mpg
# mpeg4 or msmpeg4 - gives you files with extension .avi
# msmpeg4 is recommended for use with Windows Media Player because
# it requires no installation of codec on the Windows client.
# swf - gives you a flash film with extension .swf
# flv - gives you a flash video with extension .flv
# ffv1 - FF video codec 1 for Lossless Encoding ( experimental )
# mov - QuickTime ( testing )
ffmpeg_video_codec mpeg4
# Target base directory for pictures and films %输出文件夹
# Recommended to use absolute path. (Default: current working directory)
target_dir /tmp/motion
3.motion命令启动视频录制
4.Ctrl+c退出视频录制
website
http://sourceforge.net/projects/motion/
http://www.lavrsen.dk/foswiki/bin/view/Motion/WebHome
http://www.lavrsen.dk/foswiki/bin/view/Motion/MotionGuide
ref
http://blog.csdn.net/shulianghe/article/details/8230352
ERROR: V4L2_CID_PRIVATE_BASE undeclared
gcc -g -O2 -D_REENTRANT -DMOTION_V4L2 -DMOTION_V4L2_OLD -DTYPE_32BIT="int" -DHAVE_BSWAP -march=i686 -Wall -DVERSION="3.2.11" -Dsysconfdir="/usr/local/etc" -c -o track.o track.c track.c: In function ‘uvc_center’: track.c:587:29: error: storage size of ‘control_s’ isn’t known track.c:589:24: error: ‘V4L2_CID_PRIVATE_BASE’ undeclared (first use in this function) track.c:589:24: note: each undeclared identifier is reported only once for each function it appears in track.c:592:24: error: ‘VIDIOC_S_CTRL’ undeclared (first use in this function) track.c:601:31: error: storage size of ‘queryctrl’ isn’t known track.c:605:24: error: ‘VIDIOC_QUERYCTRL’ undeclared (first use in this function) track.c:601:31: warning: unused variable ‘queryctrl’ [-Wunused-variable] track.c:587:29: warning: unused variable ‘control_s’ [-Wunused-variable] track.c:636:25: error: storage size of ‘control_s’ isn’t known track.c:636:25: warning: unused variable ‘control_s’ [-Wunused-variable] track.c: In function ‘uvc_move’: track.c:724:29: error: storage size of ‘control_s’ isn’t known track.c:726:24: error: ‘V4L2_CID_PRIVATE_BASE’ undeclared (first use in this function) track.c:729:24: error: ‘VIDIOC_S_CTRL’ undeclared (first use in this function) track.c:724:29: warning: unused variable ‘control_s’ [-Wunused-variable] track.c:779:25: error: storage size of ‘control_s’ isn’t known track.c:779:25: warning: unused variable ‘control_s’ [-Wunused-variable]
inserted "*#include <linux/videodev2.h>*" into track.h on line 13, just after the alg.h include