这篇文章主要介绍OpenWrt编译的mjpg-streamer软件包与官方编译的不一致怎么办，文中介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们一定要看完！
OpenWrt编译的mjpg-streamer软件包居然与官方编译的是不一样的版本。不管是当前trunk还是barrier breaker版都是有这个问题。自行编译的不支持yuv格式输出，也就是说如果挂载的摄像头不支持jpeg格式直接输出那就没戏了。但是官方的mjpg-streamer就没有这个问题。先看看自己编译出来的与官方的版本在input_uvc.so模块帮助上的区别。
官方版本：
root@OpenWrt:/tmp# mjpg_streamer -i "input_uvc.so --help" MJPG Streamer Version: svn rev: exported --------------------------------------------------------------- Help for input plugin..: UVC webcam grabber --------------------------------------------------------------- The following parameters can be passed to this plugin: [-d | --device ].......: video device to open (your camera) [-r | --resolution ]...: the resolution of the video device, can be one of the following strings: QSIF QCIF CGA QVGA CIF VGA SVGA XGA SXGA or a custom value like the following example: 640x480 [-f | --fps ]..........: frames per second [-y | --yuv ]..........: enable YUYV format and disable MJPEG mode [-q | --quality ]......: JPEG compression quality in percent (activates YUYV format, disables MJPEG) [-m | --minimum_size ].: drop frames smaller then this limit, useful if the webcam produces small-sized garbage frames may happen under low light conditions [-n | --no_dynctrl ]...: do not initalize dynctrls of Linux-UVC driver [-l | --led ]..........: switch the LED "on", "off", let it "blink" or leave it up to the driver using the value "auto" --------------------------------------------------------------- input_init() return value signals to exit
注意，这里可以带y参数，即可以开启支持YUYV格式。然后是自己编译的版本的：
root@OpenWrt:~# mjpg_streamer -i "input_uvc.so --help" MJPG Streamer Version: svn rev: exported --------------------------------------------------------------- Help for input plugin..: UVC webcam grabber --------------------------------------------------------------- The following parameters can be passed to this plugin: [-d | --device ].......: video device to open (your camera) [-r | --resolution ]...: the resolution of the video device, can be one of the following strings: QSIF QCIF CGA QVGA CIF VGA SVGA XGA SXGA or a custom value like the following example: 640x480 [-f | --fps ]..........: frames per second (activates YUYV format, disables MJPEG) [-m | --minimum_size ].: drop frames smaller then this limit, useful if the webcam produces small-sized garbage frames may happen under low light conditions [-n | --no_dynctrl ]...: do not initalize dynctrls of Linux-UVC driver [-l | --led ]..........: switch the LED "on", "off", let it "blink" or leave it up to the driver using the value "auto" --------------------------------------------------------------- [-t | --tvnorm ] ......: set TV-Norm pal, ntsc or secam --------------------------------------------------------------- input_init() return value signals to exit
注：自己编译的不带y参数，即不支持YUYV格式，还多了个支持的参数t，用来设置pal、ntsc制式的。查看openwrt下载的mjpg-streamer源码也没发现支持y参数。mjpg-streamer包的路径是./feeds/packages/multimedia/mjpg-streamer。patches目录下的补丁文件也没见到对y参数支持的补丁。Makefile文件主要内容：
# # Copyright (C) 2006-2014 OpenWrt.org # # This is free software, licensed under the GNU General Public License v2. # See /LICENSE for more information. # include $(TOPDIR)/rules.mk PKG_NAME:=mjpg-streamer PKG_REV:=182 PKG_VERSION:=r$(PKG_REV) PKG_RELEASE:=1 PKG_MAINTAINER:=Roger D <rogerdammit@gmail.com> PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).1.tar.bz2 PKG_SOURCE_URL:=https://svn.code.sf.net/p/mjpg-streamer/code/mjpg-streamer-experimental PKG_SOURCE_SUBDIR:=$(PKG_NAME)-$(PKG_VERSION) PKG_SOURCE_VERSION:=$(PKG_REV) PKG_SOURCE_PROTO:=svn PKG_LICENSE:=GPL-2.0 PKG_LICENSE_FILE:=LICENSE
注意上面的PKG_SOURCE_URL路径，最末尾有个“-experimental”，意思是实验性的意思。google上搜搜mjpg-streamer
https://svn.code.sf.net/p/mjpg-streamer/code/点击进去
发现mjpg-streamer有带不带“experimental”版本的区别。进一步进去查看代码带“experimental”是不支持y参数的，不带“experimental”版支持y参数，并且input_uvc插件的帮助说明与官方的一样。想不通官方为什么这么整。决定自己切换到不带“experimental”版本。
首先删除openwrt源码目录下的mjpg-streamer**.tar.gz文件。修改mjpg-streamer包路径./feeds/packages/multimedia/mjpg-streamer/下的Makefile文件，将PKG_SOURCE_URL:=https://svn.code.sf.net/p/mjpg-streamer/code/mjpg-streamer-experimental改成PKG_SOURCE_URL:=https://svn.code.sf.net/p/mjpg-streamer/code/mjpg-streamer。删除patches下的010-enable_additional_plugins.patch和020-remove_gcc_debug_options.patch补丁文件。
然后重新编译mjpg-streamer软件包：
make package/mjpg-streamer/prepare V=s make package/mjpg-streamer/install V=s
再重新安装mjpg-streamer软件包，ok。
以上是“OpenWrt编译的mjpg-streamer软件包与官方编译的不一致怎么办”这篇文章的所有内容，感谢各位的阅读！希望分享的内容对大家有帮助，更多相关知识，欢迎关注亿速云行业资讯频道！
免责声明：本站发布的内容（图片、视频和文字）以原创、转载和分享为主，文章观点不代表本网站立场，如果涉及侵权请联系站长邮箱：is@yisu.com进行举报，并提供相关证据，一经查实，将立刻删除涉嫌侵权内容。
