用fswebcam是能够获取到图像的，但是opencv 不可以 ，打开语句用的这一条 VideoCapture *camera = new VideoCapture(0);
[ 13.632458] [VFE]vfe_open
[ 13.635462] [VFE]..........................vfe clk open!.......................
[ 13.651111] [VFE]vfe_open ok
[ 13.654469] [VFE]vfe_close
[ 13.657545] [VFE]vfe select input flag = 0, s_input have not be used .
[ 13.664984] [VFE]..........................vfe clk close!.......................
[ 13.690047] [VFE]vfe_close end
[ 13.693753] [VFE]vfe_open
[ 13.696740] [VFE]..........................vfe clk open!.......................
[ 13.720320] [VFE]vfe_open ok
[ 13.723715] [VFE_ERR]input index(-1) > dev->dev_qty(1)-1 invalid!
[ 13.740066] [VFE_ERR]stream has been already off
[ 13.745345] [VFE]vfe_close
[ 13.748413] [VFE]vfe select input flag = 0, s_input have not be used .
[ 13.755819] [VFE]..........................vfe clk close!.......................
[ 13.770060] [VFE]vfe_close end
Unable to stop the stream.: Bad file descriptor
VIDIOC_G_FMT: Bad file descriptor
unknown input size.#然后尝试更换VideoCapture *camera = new VideoCapture(“/dev/video0”);
[ 23.273289] [VFE]vfe_open
[ 23.276292] [VFE]..........................vfe clk open!.......................
[ 23.291123] [VFE]vfe_open ok
[ 23.294623] [VFE_ERR]csi is not generating!
[ 23.299417] [VFE]vfe_close
[ 23.302556] [VFE]vfe select input flag = 0, s_input have not be used .
[ 23.309941] [VFE]..........................vfe clk close!.......................
[ 23.330043] [VFE]vfe_close end
unknown input size.#离线
重新编译了一下，出现一堆
[ 724.276203] [VFE]vfe_open
[ 724.279374] [VFE]..........................vfe clk open!.......................
[ 724.305184] [VFE]vfe_open ok
[ 724.309779] [VFE]vfe_close
[ 724.312938] [VFE]vfe select input flag = 0, s_input have not be used .
[ 724.320345] [VFE]..........................vfe clk close!.......................
[ 724.329319] [VFE]vfe_close end
[ 724.351358] [VFE]vfe_open
[ 724.354363] [VFE]..........................vfe clk open!.......................
[ 724.380327] [VFE]vfe_open ok
[ 724.410704] [VFE_ERR]input index(-1) > dev->dev_qty(1)-1 invalid!
[ 724.436653] [VFE_WARN]v4l2 sub device queryctrl (null) unsuccess!
[ 724.450528] [VFE_WARN]v4l2 sub device queryctrl (null) unsuccess!
[ 724.457403] [VFE_WARN]v4l2 sub device queryctrl Brightness unsuccess!
[ 724.480074] [VFE_WARN]v4l2 sub device queryctrl Contrast unsuccess!
[ 724.487125] [VFE_WARN]v4l2 sub device queryctrl Saturation unsuccess!
[ 724.500057] [VFE_WARN]v4l2 sub device queryctrl Hue unsuccess!
[ 724.506618] [VFE_WARN]v4l2 sub device queryctrl (null) unsuccess!
[ 724.530050] [VFE_WARN]v4l2 sub device queryctrl Volume unsuccess!
[ 724.536966] [VFE_WARN]v4l2 sub device queryctrl Balance unsuccess!
[ 724.550198] [VFE_WARN]v4l2 sub device queryctrl Bass unsuccess!
[ 724.556918] [VFE_WARN]v4l2 sub device queryctrl Treble unsuccess!
[ 724.580058] [VFE_WARN]v4l2 sub device queryctrl Mute unsuccess!
[ 724.586782] [VFE_WARN]v4l2 sub device queryctrl Loudness unsuccess!
[ 724.605210] [VFE_WARN]v4l2 sub device queryctrl Black Level unsuccess!
[ 724.612882] [VFE_WARN]v4l2 sub device queryctrl Do White Balance unsuccess!
[ 724.630063] [VFE_WARN]v4l2 sub device queryctrl Red Balance unsuccess!
[ 724.637465] [VFE_WARN]v4l2 sub device queryctrl Blue Balance unsuccess!
[ 724.650204] [VFE_WARN]v4l2 sub device queryctrl Gamma unsuccess!
[ 724.656976] [VFE_WARN]v4l2 sub device queryctrl Gain, Automatic unsuccess!
[ 724.680084] [VFE_WARN]v4l2 sub device queryctrl Horizontal Center unsuccess!
[ 724.687997] [VFE_WARN]v4l2 sub device queryctrl Vertical Center unsuccess!
[ 724.700186] [VFE_WARN]v4l2 sub device queryctrl Power Line Frequency unsuccess!
[ 724.708450] [VFE_WARN]v4l2 sub device queryctrl Hue, Automatic unsuccess!
[ 724.730183] [VFE_WARN]v4l2 sub device queryctrl White Balance Temperature unsuccess!
[ 724.738935] [VFE_WARN]v4l2 sub device queryctrl Sharpness unsuccess!
[ 724.760059] [VFE_WARN]v4l2 sub device queryctrl Backlight Compensation unsuccess!
[ 724.768520] [VFE_WARN]v4l2 sub device queryctrl Chroma AGC unsuccess!
[ 724.780065] [VFE_WARN]v4l2 sub device queryctrl Color Killer unsuccess!
[ 724.787510] [VFE_WARN]v4l2 sub device queryctrl Brightness, Automatic unsuccess!
[ 724.810046] [VFE_WARN]v4l2 sub device queryctrl Band-Stop Filter unsuccess!
[ 724.817931] [VFE_WARN]v4l2 sub device queryctrl Rotate unsuccess!
[ 724.840077] [VFE_WARN]v4l2 sub device queryctrl Background Color unsuccess!
[ 724.847962] [VFE_WARN]v4l2 sub device queryctrl Chroma Gain unsuccess!
[ 724.870058] [VFE_WARN]v4l2 sub device queryctrl Illuminator 1 unsuccess!
[ 724.877648] [VFE_WARN]v4l2 sub device queryctrl Illuminator 2 unsuccess!
[ 724.890056] [VFE_WARN]v4l2 sub device queryctrl Min Number of Capture Buffers unsuccess!
[ 724.899120] [VFE_WARN]v4l2 sub device queryctrl Min Number of Output Buffers unsuccess!
[ 724.940041] [VFE_WARN]v4l2 sub device queryctrl Alpha Component unsuccess!
[ 724.947832] [VFE_WARN]v4l2 sub device queryctrl Horizontal Flip For Thumb unsuccess!
[ 724.970062] [VFE CCI_0 ERR] Status error at addr_8bit = 42, wr_flag = 0, val = fad4a024
[ 724.979710] [VFE CCI_0 ERR] Status error at addr_8bit = 42, wr_flag = 0, val = fad4a024
[ 724.989203] [VFE CCI_0 ERR] Status error at addr_8bit = 42, wr_flag = 0, val = fad4a024
[ 724.998199] [CSI_ERR][GC0308]error at sensor_write_array
[ 725.004249] [VFE_ERR]bsp_csi_set_fmt error at vidioc_s_fmt_vid_cap!
libv4l2: error setting pixformat[ 725.066330] [VFE]vfe_close
: Operation not permitted
HIGHG[ 725.072022] [VFE]vfe select input flag = 0, s_input have not be used .
UI ERROR: libv4l unable to ioctl[ 725.082120] [VFE]..........................vfe clk close!.......................
S_FMT
[ 725.096103] [VFE]vfe_close end
[ 725.111997] [VFE]vfe_open
[ 725.114998] [VFE]..........................vfe clk open!.......................
[ 725.140315] [VFE]vfe_open ok
[ 725.145035] [VFE_ERR]input index(-1) > dev->dev_qty(1)-1 invalid!
[ 725.160525] [VFE_WARN]v4l2 sub device queryctrl (null) unsuccess!
[ 725.167622] [VFE_ERR]size is too large,automatically set to maximum!
[ 725.190233] [VFE_ERR]size is too large,automatically set to maximum!
[ 725.197387] [VFE_ERR]size is too large,automatically set to maximum!
[ 725.215233] [VFE_ERR]size is too large,automatically set to maximum!
[ 725.222659] [VFE_ERR]size is too large,automatically set to maximum!
[ 725.229804] [VFE_ERR]size is too large,automatically set to maximum!
[ 725.250111] [VFE_ERR]size is too large,automatically set to maximum!
[ 725.257283] [VFE_ERR]size is too large,automatically set to maximum!
[ 725.280073] [VFE_ERR]size is too large,automatically set to maximum!
[ 725.287239] [VFE_ERR]size is too large,automatically set to maximum!
[ 725.300204] [VFE_ERR]size is too large,automatically set to maximum!
[ 725.307424] [VFE_ERR]size is too large,automatically set to maximum!
[ 725.330057] [VFE_ERR]size is too large,automatically set to maximum!
[ 725.337283] [VFE_ERR]size is too large,automatically set to maximum!
[ 725.350073] [VFE_ERR]size is too large,automatically set to maximum!
[ 725.357286] [VFE_ERR]size is too large,automatically set to maximum!
[ 725.380043] [VFE_ERR]size is too large,automatically set to maximum!
[ 725.387260] [VFE_ERR]size is too large,automatically set to maximum!
[ 725.400194] [VFE_ERR]size is too large,automatically set to maximum!
[ 725.407409] [VFE_ERR]size is too large,automatically set to maximum!
[ 725.430055] [VFE_ERR]size is too large,automatically set to maximum!
[ 725.437210] [VFE_ERR]size is too large,automatically set to maximum!
[ 725.450190] [VFE_ERR]size is too large,automatically set to maximum!
[ 725.457341] [VFE_ERR]size is too large,automatically set to maximum!
[ 725.480052] [VFE_ERR]size is too large,automatically set to maximum!
[ 725.487358] [VFE_ERR]size is too large,automatically set to maximum!
[ 725.500203] [VFE_ERR]size is too large,automatically set to maximum!
[ 725.507419] [VFE_ERR]size is too large,automatically set to maximum!
[ 725.530185] [VFE_ERR]size is too large,automatically set to maximum!
[ 725.537401] [VFE_ERR]size is too large,automatically set to maximum!
[ 725.560056] [VFE_ERR]size is too large,automatically set to maximum!
[ 725.567273] [VFE_ERR]size is too large,automatically set to maximum!
[ 725.580193] [VFE_ERR]size is too large,automatically set to maximum!
[ 725.587413] [VFE_ERR]size is too large,automatically set to maximum!
[ 725.610055] [VFE_ERR]size is too large,automatically set to maximum!
[ 725.617272] [VFE_ERR]size is too large,automatically set to maximum!
[ 725.630188] [VFE_ERR]size is too large,automatically set to maximum!
[ 725.637344] [VFE_ERR]size is too large,automatically set to maximum!
[ 725.660044] [VFE_ERR]size is too large,automatically set to maximum!
[ 725.667195] [VFE_ERR]size is too large,automatically set to maximum!
[ 725.680195] [VFE_ERR]size is too large,automatically set to maximum!
[ 725.687342] [VFE_ERR]size is too large,automatically set to maximum!
[ 725.710057] [VFE_ERR]size is too large,automatically set to maximum!
[ 725.717273] [VFE_ERR]size is too large,automatically set to maximum!
[ 725.730222] [VFE_ERR]size is too large,automatically set to maximum!
[ 725.737440] [VFE_ERR]size is too large,automatically set to maximum!
[ 725.760058] [VFE_ERR]size is too large,automatically set to maximum!
[ 725.767274] [VFE_ERR]size is too large,automatically set to maximum!
[ 725.780188] [VFE_ERR]size is too large,automatically set to maximum!
[ 725.787440] [VFE_ERR]size is too large,automatically set to maximum!
[ 725.815093] [VFE_ERR]size is too large,automatically set to maximum!
[ 725.822530] [VFE_ERR]size is too large,automatically set to maximum!
[ 725.829746] [VFE_ERR]size is too large,automatically set to maximum!
[ 725.840216] [VFE_ERR]size is too large,automatically set to maximum!
[ 725.847440] [VFE_ERR]size is too large,automatically set to maximum!
[ 725.870066] [VFE_ERR]size is too large,automatically set to maximum!
[ 725.877283] [VFE_ERR]size is too large,automatically set to maximum!
[ 725.890232] [VFE_ERR]size is too large,automatically set to maximum!
[ 725.897454] [VFE_ERR]size is too large,automatically set to maximum!
[ 725.920086] [VFE_ERR]size is too large,automatically set to maximum!
[ 725.927245] [VFE_ERR]size is too large,automatically set to maximum!
[ 725.940220] [VFE_ERR]size is too large,automatically set to maximum!
[ 725.947383] [VFE_ERR]size is too large,automatically set to maximum!
[ 725.970078] [VFE_ERR]size is too large,automatically set to maximum!
[ 725.977239] [VFE_ERR]size is too large,automatically set to maximum!
[ 725.990225] [VFE_ERR]size is too large,automatically set to maximum!
[ 725.997383] [VFE_ERR]size is too large,automatically set to maximum!
[ 726.020105] [VFE_ERR]size is too large,automatically set to maximum!
[ 726.027331] [VFE_ERR]size is too large,automatically set to maximum!
[ 726.040240] [VFE_ERR]size is too large,automatically set to maximum!
[ 726.047592] [VFE_ERR]size is too large,automatically set to maximum!
[ 726.070061] [VFE_ERR]size is too large,automatically set to maximum!
[ 726.077278] [VFE_ERR]size is too large,automatically set to maximum!
[ 726.090190] [VFE_ERR]size is too large,automatically set to maximum!
[ 726.097402] [VFE_ERR]size is too large,automatically set to maximum!
[ 726.115215] [VFE_ERR]size is too large,automatically set to maximum!
[ 726.130054] [VFE_ERR]size is too large,automatically set to maximum!
[ 726.137266] [VFE_ERR]size is too large,automatically set to maximum!
[ 726.150190] [VFE_ERR]size is too large,automatically set to maximum!
[ 726.157406] [VFE_ERR]size is too large,automatically set to maximum!
[ 726.180061] [VFE_ERR]size is too large,automatically set to maximum!
[ 726.187282] [VFE_ERR]size is too large,automatically set to maximum!
[ 726.200204] [VFE_ERR]size is too large,automatically set to maximum!
[ 726.207419] [VFE_ERR]size is too large,automatically set to maximum!
[ 726.230056] [VFE_ERR]size is too large,automatically set to maximum!
[ 726.237202] [VFE_ERR]size is too large,automatically set to maximum!
[ 726.250263] [VFE_ERR]size is too large,automatically set to maximum!
[ 726.257422] [VFE_ERR]size is too large,automatically set to maximum!
[ 726.280060] [VFE_ERR]size is too large,automatically set to maximum!
[ 726.287214] [VFE_ERR]size is too large,automatically set to maximum!
[ 726.300195] [VFE_ERR]size is too large,automatically set to maximum!
[ 726.307410] [VFE_ERR]size is too large,automatically set to maximum!
[ 726.330050] [VFE_ERR]size is too large,automatically set to maximum!
[ 726.337268] [VFE_ERR]size is too large,automatically set to maximum!
[ 726.350226] [VFE_ERR]size is too large,automatically set to maximum!
[ 726.357432] [VFE_ERR]size is too large,automatically set to maximum!
[ 726.380045] [VFE_ERR]size is too large,automatically set to maximum!
[ 726.387263] [VFE_ERR]size is too large,automatically set to maximum!
[ 726.400192] [VFE_ERR]size is too large,automatically set to maximum!
[ 726.407407] [VFE_ERR]size is too large,automatically set to maximum!
[ 726.430174] [VFE_ERR]size is too large,automatically set to maximum!
[ 726.437325] [VFE_ERR]size is too large,automatically set to maximum!
[ 726.460062] [VFE_ERR]size is too large,automatically set to maximum!
[ 726.467216] [VFE_ERR]size is too large,automatically set to maximum!
[ 726.480189] [VFE_ERR]size is too large,automatically set to maximum!
[ 726.487343] [VFE_ERR]size is too large,automatically set to maximum!
[ 726.510061] [VFE_ERR]size is too large,automatically set to maximum!
[ 726.517274] [VFE_ERR]size is too large,automatically set to maximum!
[ 726.530188] [VFE_ERR]size is too large,automatically set to maximum!
[ 726.537402] [VFE_ERR]size is too large,automatically set to maximum!
[ 726.560054] [VFE_ERR]size is too large,automatically set to maximum!
[ 726.567271] [VFE_ERR]size is too large,automatically set to maximum!
[ 726.580199] [VFE_ERR]size is too large,automatically set to maximum!
[ 726.587416] [VFE_ERR]size is too large,automatically set to maximum!
[ 726.610056] [VFE_ERR]size is too large,automatically set to maximum!
[ 726.617276] [VFE_ERR]size is too large,automatically set to maximum!
[ 726.630062] [VFE_ERR]size is too large,automatically set to maximum!
[ 726.637211] [VFE_ERR]size is too large,automatically set to maximum!
[ 726.660214] [VFE_ERR]input index(1) > dev->dev_qty(1)-1 invalid!
[ 726.666993] [VFE_ERR]input index(1) > dev->dev_qty(1)-1 invalid!
[ 726.680483] [VFE_WARN]v4l2 sub device queryctrl Hue unsuccess!
[ 726.687055] [VFE_WARN]v4l2 sub device queryctrl Saturation unsuccess!
[ 726.715074] [VFE_WARN]v4l2 sub device queryctrl Contrast unsuccess!
[ 726.722344] [VFE_WARN]v4l2 sub device queryctrl Gamma unsuccess!
[ 726.729163] [VFE_WARN]v4l2 sub device queryctrl Brightness unsuccess!
[ 726.750132] [VFE_WARN]v4l2 sub device queryctrl Brightness unsuccess!
[ 726.757375] [VFE_WARN]v4l2 sub device queryctrl Hue unsuccess!
[ 726.770061] [VFE_WARN]v4l2 sub device queryctrl Contrast unsuccess!
[ 726.777107] [VFE_WARN]v4l2 sub device queryctrl Saturation unsuccess!
[ 726.800043] [VFE_WARN]v4l2 sub device queryctrl Gamma unsuccess!
HIGHGUI ERROR: libv4l unable to [ 726.807169] [VFE]vfe_close
ioctl VIDIOCSPICT
[ 726.812916] [VFE]vfe select input flag = 0, s_input have not be used .
[ 726.822123] [VFE]..........................vfe clk close!.......................
[ 726.840073] [VFE]vfe_close end离线
fswebcam是可以用的，主要要用opencv有问题
离线
晕哥说的有道理，我在重新编译opencv了
离线
重新编译之后还是不行，问了三个以上在全志芯片上用opencv的人，全都是v4l底层调用的，没有用这条语句，顺带一提，这条语句在主线摄像头上是可以通过的。然后换荔枝派zero那个可以用的固件，这条语句同样不可以执行。
离线
是哪一条语句呢?
VideoCapture *camera = new VideoCapture(0);
离线
VideoCapture() 在 opencv 里面是怎么实现的？跟踪进去看看是什么情况， 哪里出错了。
if (-1 == xioctl (capture->deviceHandle, VIDIOC_S_FMT, &capture->form)) {
fprintf(stderr, "HIGHGUI ERROR: libv4l unable to ioctl S_FMT\n");
return -1;
}
这里有问题
离线
这个是设置摄像头输出格式的吧，按理来说一定会实现这个命令。确认驱动没有实现吗?
驱动应该是实现了的，所以在想是不是opencv底层调用问题
离线
解决是底层调用问题，一个是s_fmt设置，将opencv底层从xioctl改成ioctl。接下来还出了一个错一个是s_ctrl的问题类似这样，全志自己修改了videodev2.h文件导致control有问题，继续在opencv底层改这个函数改成即使=-1不退出继续进行。
离线
来反馈一下后续情况，并没有成功使用，最后还是v4l2底层调用获取图片了，bsp驱动并不能和opencv匹配。
只能将目前发现的问题暂时和大家分享一下。
1、必须指定vidioc_s_input设置，opencv只做了g_input。
2、我的摄像头驱动即使设置了不支持的格式也不会返回错误，cap_v4l会一开始就尝试设置这个格式，返回错误才接着设置其他格式。摄像头并不支持BGR24但没有返回错误导致最后取不到帧或者帧全黑。
但是这里我即使注释掉其余的把摄像头帧格式设置成UYVY（cap_v4l会自行做UYVY_TO_BGR的转换），获取到的图片会有四小块且是绿色的。目前找不到错误在哪，所以直接放弃更改cap_v4l.cpp。
注：之前我勾选了buildroot里的libv4l，opencv就会编译cap_libv4l.cpp来进行v4l2调用，不推荐这个，因为这个只支持bgr24没有格式转换代码。
离线
请教，你用buildroot哪个版本
buildroot里面的opencv，需要特别配置吗，我配置不成功
我试过buildroot2017 编译opencv,程序可以编译通过，但是放在v3s运行会出错:
# ./testopencv OpenCV Error: Unspecified error (The function is not implemented. Rebuild the library with Windows, GTK+ 2.x or Carbon support. If you are on Ubuntu or Debian, install libgtk2.0-dev and pkg-config, then re-run cmake or configure script) in cvNamedWindow, file /home/vmzys/work/2019/my_imx6ul/code-build/rootfs/buildroot-2017.08.1/output/build/opencv3-3.2.0/modules/highgui/src/window.cpp, line 565 terminate called after throwing an instance of 'cv::Exception' what(): /home/vmzys/work/2019/my_imx6ul/code-build/rootfs/buildroot-2017.08.1/output/build/opencv3-3.2.0/modules/highgui/src/window.cpp:565: error: (-2) The function is not implemented. Rebuild the library with Windows, GTK+ 2.x or Carbon support. If you are on Ubuntu or Debian, install libgtk2.0-dev and pkg-config, then re-run cmake or configure script in function cvNamedWindow Aborted #
你是不是用了cvNameWindow但是你没有编译图形界面库？你试试勾选buildroot里的libgtk，我没有用到图形界面所以没有用到这些
离线
你的依赖没有勾选，你看到depend on了吗，所有的选项都必须是Y
确实用到了cvNameWindow，程序只有简单几行：
MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWindow) { ui->setupUi(this); // read an image cv::Mat image = cv::imread("1.jpg", 1); // create image window named "My Image" cv::namedWindow("My Image 2019"); // show the image on window cv::imshow("My Image2019", image); }这个 libgtk很尴尬，我也看到错误提示，但是buildroot里面根本找不到 libgtk2.0 ! ...可能是我姿势不对吧
下面我截个图
---
- buildroot里面可以搜索到 libgtk2：
https://whycan.cn/files/members/1331/serlibg.png- 实际去选择找不到，也没任何依赖提示
https://whycan.cn/files/members/1331/lib2err.png你能找到libgtk2吗
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