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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！
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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：