【Ubuntu 10.10】mjpg-streamer：Init v4L2 failed

系統：Ubuntu 10.10

啟動： ./start.sh

錯誤內容:

[email protected]:~/mjpg-streamer/mjpg-streamer-experimental# ./start.sh
MJPG Streamer Version: svn rev: 3:160
i: Using V4L2 device.: /dev/video0
i: Desired Resolution: 640 x 480
i: Frames Per Second.: -1
i: Format............: JPEG
Unable to set format: 1196444237 res: 640x480
Init v4L2 failed !! exit fatal
i: init_VideoIn failed

錯誤原因：

市面上大部分攝像頭都是支持YUV的，而不是JPEG的。mjpg-stream支持JPEG和YUV兩種格式。

[www.linuxidc.com@linuxidc mjpg-streamer]$ cd mjpg-streamer-experimental/plugins/input_uvc/

[www.linuxidc.com@linuxidc input_uvc]$ vim input_uvc.c

int input_init(input_parameter *param, int id)
{
    char *dev = "/dev/video0", *s;
    int width = 640, height = 480, fps = -1, format = V4L2_PIX_FMT_MJPEG, i;

    /* initialize the mutes variable */
    if(pthread_mutex_init(&cams[id].controls_mutex, NULL) != 0) {
        IPRINT("could not initialize mutex variable\n");
        exit(EXIT_FAILURE);
    }
......................

format = V4L2_PIX_FMT_YUYV

以上就設置了默認的圖像格式，重新把模塊編譯，之後就成功了！