gstreamer插件库没有链接到opencv共享对象库——Ubuntu上的“未定义的符号”。

I have tried this for now whole weekend - Saturday/Sunday and Monday spending couple of hours but to no avail. I am following the gstreamer plugin writer's guide http://gstreamer.freedesktop.org/data/doc/gstreamer/head/pwg/html/section-boiler-project-stamp.html. I had gstreamer-0.10 (sudo apt-get install method) and OpenCV 2.4 already installed before trying gstreamer plugin procedure. I am using default prefix (/usr/local/lib/gstreamer-0.10 for plugin testing during ./configure prior to sudo make && sudo make install)

我已经尝试了整个周末-周六/周日和周一花费了几个小时，但是没有效果。我正在跟踪gstreamer插件作者的指南http://gstreamer.freedesktop.org/data/doc/gstreamer/head/pwg/html/sectionboil-projectstamp.html。在尝试gstreamer插件程序之前，我已经安装了gstreamer0.10 (sudo apt-get安装方法)和OpenCV 2.4。我使用默认前缀(/usr/local/lib/ gstreamer0.10进行插件测试。/在sudo make && sudo进行安装之前进行配置)

I managed to generate the boilerplate code. Now I added a cvcreateImage like

我设法生成了样板代码。现在我添加了一个cvcreateImage。

static GstFlowReturn
gst_cvtestfilter_chain (GstPad * pad, GstBuffer * buf)
{
Gstcvtestfilter *filter;
GstBuffer *outbuf;
IplImage* cvImage = cvCreateImage(cvSize(cvwidth,cvheight),cvdepth, cvchannels);
.
.
}

If cvImage line is commented everything works smoothly. All tests are ok. Linking against OpenCV fails for some reason if I don't comment that line.

如果cvImage线被注释，一切都很顺利。所有的测试就可以了。如果我不评论这句话，与OpenCV的链接就会失败。

I modified the makefile.am to add OpenCV flags in src directory as

我修改了makefile。是否在src目录中添加OpenCV标志?

 # Note: plugindir is set in configure

##############################################################################
# TODO: change libgstcvtestfilter.la to something else, e.g. libmysomething.la     #
##############################################################################
plugin_LTLIBRARIES = libgstcvtestfilter.la

##############################################################################
# TODO: for the next set of variables, name the prefix if you named the .la, #
#  e.g. libmysomething.la => libmysomething_la_SOURCES                       #
#                            libmysomething_la_CFLAGS                        #
#                            libmysomething_la_LIBADD                        #
#                            libmysomething_la_LDFLAGS                       #
##############################################################################

# sources used to compile this plug-in
libgstcvtestfilter_la_SOURCES = gstcvtestfilter.c gstcvtestfilter.h

# compiler and linker flags used to compile this plugin, set in configure.ac
libgstcvtestfilter_la_CFLAGS = $(GST_CFLAGS) $(OPENCV_CFLAGS)
libgstcvtestfilter_la_LIBADD = $(GST_LIBS) $(OPENCV_LIBS)
libgstcvtestfilter_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS) 
libgstcvtestfilter_la_LIBTOOLFLAGS = --tag=disable-static

# headers we need but don't want installed
noinst_HEADERS = gstcvtestfilter.h

I also modified configure.ac in the parent directory by adding

我也修改配置。在父目录中添加的ac。

 dnl *** opencv ***
translit(dnm, m, l) AM_CONDITIONAL(USE_OPENCV, true)

  dnl we specify a max. version too because we set CV_NO_BACKWARD_COMPATIBILITY
  dnl and don't want the build to break when a new opencv version comes out.
  dnl Need to adjust this upwards once we know that our code compiles fine with
  dnl a new version and the no-backward-compatibility define. (There doesn't
  dnl seem to be a switch to suppress the warnings the cvcompat.h header
  dnl causes.)
  PKG_CHECK_MODULES(OPENCV, opencv >= 2.0.0 opencv <= 3.1.0 , [
    AC_PROG_CXX
    AC_LANG_CPLUSPLUS
    OLD_CPPFLAGS=$CPPFLAGS
    CPPFLAGS=$OPENCV_CFLAGS
    AC_CHECK_HEADER(highgui.h, HAVE_HIGHGUI="yes", HAVE_HIGHGUI="no")
    AC_CHECK_HEADER(cvaux.h, HAVE_CVAUX="yes", HAVE_CVAUX="no")
    CPPFLAGS=$OLD_CPPFLAGS
    AC_LANG_C
    if test "x$HAVE_HIGHGUI" = "xno"; then
      AC_MSG_RESULT(highgui.h could not be found.)
      HAVE_OPENCV="no"
    elif test "x$HAVE_CVAUX" = "xno"; then
      AC_MSG_RESULT(cvaux.h could not be found.)
      HAVE_OPENCV="no"
    else
      HAVE_OPENCV="yes" 
      AC_SUBST(OPENCV_CFLAGS)
      AC_SUBST(OPENCV_LIBS)  
    fi
  ], [
    HAVE_OPENCV="no"
    AC_MSG_RESULT(no)
  ])

The compilation is fine - no errors.

编译很好，没有错误。

Now when I run the plugin in pipeline I get this message

现在，当我在管道中运行插件时，我得到了这个消息。

(gst-plugin-scanner:6396): GStreamer-WARNING **: Failed to load plugin '/usr/local/lib/gstreamer-0.10/libgstcvtestfilter.so': /usr/local/lib/gstreamer-0.10/libgstcvtestfilter.so: undefined symbol: cvCreateImage

So obviously my opencv situated in /usr/local/lib is not linking properly.

显然，我的opencv位于/usr/local/lib中没有正确链接。

sudo gedit /etc/bash.bashrc contains

sudo中/etc/bash.bashrc包含(

#Added By me
PKG_CONFIG_PATH=$PKG_CONFIG_PATH:/usr/local/lib/pkgconfig
export PKG_CONFIG_PATH

#Added By me
PATH=$PATH:/opt/Xilinx/13.4/ISE_DS/ISE/bin/lin
export PATH

GST_PLUGIN_PATH=$GST_PLUGIN_PATH:/usr/local/lib/gstreamer-0.10
export GST_PLUGIN_PATH

sudo gedit /etc/ld.so.conf.d/opencv.conf contains

sudo中/etc/ld.so.conf.d / opencv。设计包含

/usr/local/lib

sudo gedit /etc/ld.so.conf.d/gst.conf contains

sudo中/etc/ld.so.conf.d /销售税。设计包含

/usr/local/lib/gstreamer-0.10

sudo ldconfig -v

sudo ldconfig - v

sudo gedit ~/.bashrc contains

sudo中~ /。bashrc包含(

export LD_LIBRARY_PATH=/usr/local/lib:/usr/local/lib/gstreamer-0.10

ldd /usr/local/lib/gstreamer-0.10/libgstcvtestfilter.so gives no opencv dependency which is strange

ldd /usr/local/lib/gstreamer - 0.10 / libgstcvtestfilter。所以没有opencv依赖，这很奇怪。

linux-gate.so.1 =>  (0xb77b6000)
libgstreamer-0.10.so.0 => /usr/lib/i386-linux-gnu/libgstreamer-0.10.so.0 (0xb76b0000)
libgobject-2.0.so.0 => /usr/lib/i386-linux-gnu/libgobject-2.0.so.0 (0xb7661000)
libglib-2.0.so.0 => /lib/i386-linux-gnu/libglib-2.0.so.0 (0xb7567000)
libpthread.so.0 => /lib/i386-linux-gnu/libpthread.so.0 (0xb754c000)
libc.so.6 => /lib/i386-linux-gnu/libc.so.6 (0xb73a7000)
libgmodule-2.0.so.0 => /usr/lib/i386-linux-gnu/libgmodule-2.0.so.0 (0xb73a2000)
libxml2.so.2 => /usr/lib/i386-linux-gnu/libxml2.so.2 (0xb7255000)
libm.so.6 => /lib/i386-linux-gnu/libm.so.6 (0xb7228000)
librt.so.1 => /lib/i386-linux-gnu/librt.so.1 (0xb721f000)
libdl.so.2 => /lib/i386-linux-gnu/libdl.so.2 (0xb721a000)
libffi.so.6 => /usr/lib/i386-linux-gnu/libffi.so.6 (0xb7213000)
libpcre.so.3 => /lib/i386-linux-gnu/libpcre.so.3 (0xb71d7000)
/lib/ld-linux.so.2 (0xb77b7000)
libz.so.1 => /lib/i386-linux-gnu/libz.so.1 (0xb71c0000)

My OS is 32 bit 12.04 Ubuntu. If anyone can point me right direction I shall be grateful. Thanks.

我的操作系统是32位12.04 Ubuntu。如果有人能指出我的正确方向，我将不胜感激。谢谢。

Update: (June 29 2012)

更新:(2012年6月29日)

Taking Cue from OpenCV experience I modified the configure.ac for OpenGL if someone is interested

根据OpenCV的经验，我修改了配置。如果有人感兴趣，请用ac。

AC_CHECK_HEADER(
    GL/gl.h,
    AC_DEFINE(
        [HAVE_OPENGL],
        [],
        Define to 1 if you have the <GL/gl.h> header file.
        )
        OPENGL_LIBS="$X_LIBS -lGL -lGLU -lpthread -lglut -lGLEW"
        opengl=yes,
    AC_MSG_WARN([*** no GL/gl.h -- opengl and SDL support disabled])
)
AC_SUBST(OPENGL_CFLAGS)
AC_SUBST(OPENGL_LIBS)


dnl AC_ARG_WITH(
dnl     opengl-cflags,
dnl     [  --with-opengl-cflags=PATH    Specify OpenGL cflags],
dnl     OPENGL_CFLAGS="$withval", OPENGL_CFLAGS="")
dnl AC_ARG_WITH(
dnl     opengl-libs,
dnl     [  --with-opengl-libs=PATH      Specify OpenGL libs (default is -lGL -lGLU -lpthread)],
dnl     OPENGL_LIBS="$withval", OPENGL_LIBS="-lGL -lGLU -lpthread -lglut -lGLEW")
dnl AC_SUBST(OPENGL_CFLAGS)
dnl AC_SUBST(OPENGL_LIBS)

3 个解决方案

#1

I know that the question was related to version 0.1 of GStreamer, but I've come across with a similar error with GStreamer v1.4.5 when compiling from source, and with OpenCV 2.4.10.1 also compiled from source.

我知道这个问题与GStreamer的版本0.1有关，但是我在从源代码编译时遇到了类似的错误，从源代码编译，opencv2.4.10.1也从源代码编译。

In my case, running gst-inspect-1.0 would print the following message:

在我的例子中，运行gst- inspection -1.0将打印以下消息:

(gst-plugin-scanner:7485): GStreamer-WARNING **: Failed to load plugin '/usr/local/lib/gstreamer-1.0/libgstopencv.so': /usr/local/lib/gstreamer-1.0/libgstopencv.so: undefined symbol: cvCloneImage
...
...
Total count: 196 plugins (1 blacklist entry not shown), 1109 features

My solution was inspired in the solution 2 from here, but instead of changing source files just pass the OPENCV_LIBS environment variable to autogen.sh.

我的解决方案从这里得到了解决方案2的启发，但不是更改源文件，而是将OPENCV_LIBS环境变量传递给autogen.sh。

OPENCV_LIBS="-lopencv_core -lopencv_imgproc -lopencv_highgui -lopencv_ml -lopencv_video -lopencv_features2d -lopencv_calib3d -lopencv_objdetect -lopencv_contrib -lopencv_legacy -lopencv_flann -lopencv_gpu -lopencv_legacy -lopencv_nonfree -lopencv_ocl -lopencv_photo -lopencv_stitching -lopencv_superres -lopencv_videostab" ./autogen.sh

You may need to adjust the libraries depending on the used build configuration.

您可能需要根据使用的构建配置调整库。

Here is my output from pkg-config --libs opencv:

这是我的pkg-config -libs opencv的输出:

/usr/local/lib/libopencv_calib3d.so /usr/local/lib/libopencv_contrib.so /usr/local/lib/libopencv_core.so /usr/local/lib/libopencv_features2d.so /usr/local/lib/libopencv_flann.so /usr/local/lib/libopencv_gpu.so /usr/local/lib/libopencv_highgui.so /usr/local/lib/libopencv_imgproc.so /usr/local/lib/libopencv_legacy.so /usr/local/lib/libopencv_ml.so /usr/local/lib/libopencv_nonfree.so /usr/local/lib/libopencv_objdetect.so /usr/local/lib/libopencv_ocl.so /usr/local/lib/libopencv_photo.so /usr/local/lib/libopencv_stitching.so /usr/local/lib/libopencv_superres.so /usr/local/lib/libopencv_ts.a /usr/local/lib/libopencv_video.so /usr/local/lib/libopencv_videostab.so -lrt -lpthread -lm -ldl

#2

Did the configure run actualy find the opencv libraries? Check config.log. Also what exacly have you changed in the configure.ac part? As you noticed correctly the generated makefile is supposed to have those vars expanded.

配置运行是否发现opencv库?检查config.log。同样，在配置中你改变了什么。交流部分?正如您所注意到的，生成的makefile应该会扩展这些vars。

#3

I managed to solve this problem consulting a friend with an ugly hack in Makefile in src directory.

我设法解决了这个问题，咨询了一个在src目录中有一个丑陋黑客的朋友。

Solution I

解我

LIBS = was empty so had to add OpenCV libraries there as follows.

LIBS =是空的，所以必须添加OpenCV库，如下所示。

LDFLAGS =
LIBOBJS =
LIBS = -lopencv_core -lopencv_highgui # One may add more OpenCV libraries as needed here
LIBTOOL = $(SHELL) $(top_builddir)/libtool

Solution II (Better Solution Comes Along - But Still Ugly)

解决方案II(更好的解决方案出现了——但仍然很难看)

Leave LIBS = empty but edit OPENCV_LIBS= in the Makefile.

让LIBS=空，但在Makefile中编辑OPENCV_LIBS=。

In my case I had

在我的案例中。

OPENCV_LIBS = /usr/local/lib/libopencv_highgui.so /usr/local/lib/libopencv_core.so ...

OPENCV_LIBS = /usr/local/lib/libopencv_highgui。所以/usr/local/lib/libopencv_core。所以…

I replaced this line by

我把这条线替换了。

OPENCV_LIBS = -lopencv_highgui -lopencv_core ... so on and so forth.

OPENCV_LIBS = -lopencv_highgui -lopencv_core…等等。

Replace this for all OpenCV libraries as needed in the Makefile at this line and it should work.

在这一行的Makefile中，根据需要将此替换为所有OpenCV库，并且它应该工作。

Solution III (Preferred) Change Makefile.am as follows and add all OpenCV libraries as necessary.

解决方案III(首选)更改Makefile。如下所示，并在必要时添加所有OpenCV库。

 # Note: plugindir is set in configure

##############################################################################
# TODO: change libgstcvtestfilter.la to something else, e.g. libmysomething.la     #
##############################################################################
plugin_LTLIBRARIES = libgstcvtestfilter.la

##############################################################################
# TODO: for the next set of variables, name the prefix if you named the .la, #
#  e.g. libmysomething.la => libmysomething_la_SOURCES                       #
#                            libmysomething_la_CFLAGS                        #
#                            libmysomething_la_LIBADD                        #
#                            libmysomething_la_LDFLAGS                       #
##############################################################################

# sources used to compile this plug-in
libgstcvtestfilter_la_SOURCES = gstcvtestfilter.c gstcvtestfilter.h

# compiler and linker flags used to compile this plugin, set in configure.ac
libgstcvtestfilter_la_CFLAGS = $(GST_CFLAGS) $(OPENCV_CFLAGS)
libgstcvtestfilter_la_LIBADD = $(GST_LIBS) $(OPENCV_LIBS) -lopencv_highgui -lopencv_core
libgstcvtestfilter_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS) 
libgstcvtestfilter_la_LIBTOOLFLAGS = --tag=disable-static

# headers we need but don't want installed
noinst_HEADERS = gstcvtestfilter.h

There is difference in the way opencv 2.3.1 and 2.4.0 is installed as can be seen from /usr/local/lib/pkgconfig/opencv.pc

从/usr/local/lib/pkgconfig/opencv.pc上可以看到opencv 2.3.1和2.4.0的安装方式有差异。

/usr/local/lib/pkgconfig/opencv.pc file should look as follows: (The PC on which this gstreamer opencv plugin is installed works fine - Ubuntu 10.04)

/usr/local/lib/pkgconfig/opencv.pc文件应该如下所示:(gstreamer opencv插件安装的个人电脑运行良好——Ubuntu 10.04)

# Package Information for pkg-config

prefix=/usr/local
exec_prefix=${prefix}
libdir=${exec_prefix}/lib
includedir_old=${prefix}/include/opencv
includedir_new=${prefix}/include

Name: OpenCV
Description: Open Source Computer Vision Library
Version: 2.3.1
Libs: -L${libdir} -lopencv_core -lopencv_imgproc -lopencv_highgui -lopencv_ml -lopencv_video -lopencv_features2d -lopencv_calib3d -lopencv_objdetect -lopencv_contrib -lopencv_legacy -lopencv_flann
Cflags: -I${includedir_old} -I${includedir_new}

instead of (The PC on which this gstreamer opencv plugin is installed needs Makefile modification - Ubuntu 12.04):

而不是(这个gstreamer opencv插件安装的PC需要Makefile修改- Ubuntu 12.04):

# Package Information for pkg-config

prefix=/usr/local
exec_prefix=${prefix}
libdir=
includedir_old=${prefix}/include/opencv
includedir_new=${prefix}/include

Name: OpenCV
Description: Open Source Computer Vision Library
Version: 2.4.0
Libs:  ${exec_prefix}/lib/libopencv_calib3d.so ${exec_prefix}/lib/libopencv_contrib.so ${exec_prefix}/lib/libopencv_core.so ${exec_prefix}/lib/libopencv_features2d.so ${exec_prefix}/lib/libopencv_flann.so ${exec_prefix}/lib/libopencv_gpu.so ${exec_prefix}/lib/libopencv_highgui.so ${exec_prefix}/lib/libopencv_imgproc.so ${exec_prefix}/lib/libopencv_legacy.so ${exec_prefix}/lib/libopencv_ml.so ${exec_prefix}/lib/libopencv_nonfree.so ${exec_prefix}/lib/libopencv_objdetect.so ${exec_prefix}/lib/libopencv_photo.so ${exec_prefix}/lib/libopencv_stitching.so ${exec_prefix}/lib/libopencv_ts.so ${exec_prefix}/lib/libopencv_video.so ${exec_prefix}/lib/libopencv_videostab.so
Cflags: -I${includedir_old} -I${includedir_new}

I'll post better solution if I can find any.

如果我能找到更好的解决方案，我就会发布更好的解决方案。

#1