1.在/etc/motion/文件夹下将原始生成对应文件cameraX-dist.conf(x = 1, 2, 3...)更名为cameraX.conf并将文件内容按照需求更改， 有几个摄像头就改几个对应编号文件。（注：须将其中input变量值赋值为-1，若使用的是usb摄像头）
2.在/etc/motion/motion.conf最后：
##############################################################
# camera config files - One for each camera.
# Except if only one camera - You only need this config file.
# If you have more than one camera you MUST define one camera
# config file for each camera in addition to this config file.
##############################################################

# Remember: If you have more than one camera you must have one
# camera file for each camera. E.g. 2 cameras requires 3 files:
# This motion.conf file AND camera1.conf and camera2.conf.
# Only put the options that are unique to each camera in the
# camera config files.
camera /etc/motion/camera1.conf
camera /etc/motion/camera2.conf
; camera /etc/motion/camera3.conf
; camera /etc/motion/camera4.conf

中对应个数的摄像头配置文件前的分号取消掉（在这里以两个摄像头配置作为范例），重新启动motion即可完成多摄像头配置