Ubuntu 编译opencv出错：‘GstMiniObjectClass’ does not name a type 解决方法
由于毕业设计是计算机视觉项目。我选择使用Python+OpenCV的平台来完成，因为多练习Python也有利于以后研究生阶段机器学习的研究。
我有点技术洁癖：（，本来电脑已经有OpenCV了，硬是想更新成最新的3.0.0-rc1。但是发现下载下来编译不了。具体出现问题的编译报错信息如下：
[ 45%] Building CXX object modules/videoio/CMakeFiles/opencv_videoio.dir/src/cap_libv4l.cpp.o
In file included from /usr/include/gstreamer-0.10/gst/pbutils/encoding-profile.h:29:0,
from /opt/opencv-3.0.0-rc1/modules/videoio/src/cap_gstreamer.cpp:65:
/usr/include/gstreamer-0.10/gst/pbutils/gstdiscoverer.h:35:9: error: ‘GstMiniObjectClass’ does not name a type
typedef GstMiniObjectClass GstDiscovererStreamInfoClass;
^
/usr/include/gstreamer-0.10/gst/pbutils/gstdiscoverer.h:83:9: error: ‘GstMiniObjectClass’ does not name a type
typedef GstMiniObjectClass GstDiscovererContainerInfoClass;
^
/usr/include/gstreamer-0.10/gst/pbutils/gstdiscoverer.h:104:9: error: ‘GstMiniObjectClass’ does not name a type
typedef GstMiniObjectClass GstDiscovererAudioInfoClass;
^
/usr/include/gstreamer-0.10/gst/pbutils/gstdiscoverer.h:129:9: error: ‘GstMiniObjectClass’ does not name a type
typedef GstMiniObjectClass GstDiscovererVideoInfoClass;
^
/usr/include/gstreamer-0.10/gst/pbutils/gstdiscoverer.h:159:9: error: ‘GstMiniObjectClass’ does not name a type
typedef GstMiniObjectClass GstDiscovererSubtitleInfoClass;
^
/usr/include/gstreamer-0.10/gst/pbutils/gstdiscoverer.h:202:9: error: ‘GstMiniObjectClass’ does not name a type
typedef GstMiniObjectClass GstDiscovererInfoClass;
^
In file included from /opt/opencv-3.0.0-rc1/modules/videoio/src/cap_gstreamer.cpp:65:0:
/usr/include/gstreamer-0.10/gst/pbutils/encoding-profile.h:47:9: error: ‘GstMiniObjectClass’ does not name a type
typedef GstMiniObjectClass GstEncodingProfileClass;
^
/usr/include/gstreamer-0.10/gst/pbutils/encoding-profile.h:66:9: error: ‘GstEncodingProfileClass’ does not name a type
typedef GstEncodingProfileClass GstEncodingContainerProfileClass;
^
/usr/include/gstreamer-0.10/gst/pbutils/encoding-profile.h:85:9: error: ‘GstEncodingProfileClass’ does not name a type
typedef GstEncodingProfileClass GstEncodingVideoProfileClass;
^
/usr/include/gstreamer-0.10/gst/pbutils/encoding-profile.h:104:9: error: ‘GstEncodingProfileClass’ does not name a type
typedef GstEncodingProfileClass GstEncodingAudioProfileClass;
^
/opt/opencv-3.0.0-rc1/modules/videoio/src/cap_gstreamer.cpp: In member function ‘virtual bool CvCapture_GStreamer::grabFrame()’:
/opt/opencv-3.0.0-rc1/modules/videoio/src/cap_gstreamer.cpp:232:57: error: ‘gst_app_sink_pull_sample’ was not declared in this scope
sample = gst_app_sink_pull_sample(GST_APP_SINK(sink));
^
make[2]: *** [modules/videoio/CMakeFiles/opencv_videoio.dir/src/cap_gstreamer.cpp.o] 错误 1
make[2]: *** 正在等待未完成的任务....
[ 45%] Building CXX object modules/photo/CMakeFiles/opencv_photo.dir/src/npr.cpp.o
[ 45%] Building CXX object modules/photo/CMakeFiles/opencv_photo.dir/src/denoise_tvl1.cpp.o
make[1]: *** [modules/videoio/CMakeFiles/opencv_videoio.dir/all] 错误 2
make[1]: *** 正在等待未完成的任务....
[ 45%] Building CXX object modules/photo/CMakeFiles/opencv_photo.dir/src/seamless_cloning_impl.cpp.o
[ 45%] Building CXX object modules/photo/CMakeFiles/opencv_photo.dir/src/hdr_common.cpp.o
[ 45%] Building CXX object modules/photo/CMakeFiles/opencv_photo.dir/src/calibrate.cpp.o
[ 45%] Building CXX object modules/photo/CMakeFiles/opencv_photo.dir/src/denoising.cuda.cpp.o
[ 45%] Building CXX object modules/photo/CMakeFiles/opencv_photo.dir/opencl_kernels_photo.cpp.o
Linking CXX shared library ../../lib/libopencv_photo.so
[ 45%] Built target opencv_photo
make: *** [all] 错误 2
提取其中一句来看看：
/usr/include/gstreamer-0.10/gst/pbutils/gstdiscoverer.h:35:9: error: ‘GstMiniObjectClass’ does not name a type typedef GstMiniObjectClass GstDiscovererStreamInfoClass;
明显地，与gstreamer-0.10有关，于是重装libgstreamer0.10-dev 、以及libgstreamer-plugins-base0.10-dev，没用。于是下载旧版本的opencv尝试编译，但是经过3.0.0-beta以及2.4.10都不行后，只有opencv-2.4.9编译是正常的。于是尝试对比2.4.9以及3.0.0-rc1的不同。看到CMakeList有如下信息：
3.0.0-rc1的是：
OCV_OPTION(WITH_FFMPEG "Include FFMPEG support" ON IF (NOT ANDROID AND NOT IOS AND NOT WINRT) ) OCV_OPTION(WITH_GSTREAMER "Include Gstreamer support" ON IF (UNIX AND NOT ANDROID) ) OCV_OPTION(WITH_GSTREAMER_0_10 "Enable Gstreamer 0.10 support (instead of 1.x)" OFF ) OCV_OPTION(WITH_GTK "Include GTK support" ON IF (UNIX AND NOT APPLE AND NOT ANDROID) )
2.4.9的是：
OCV_OPTION(WITH_FFMPEG "Include FFMPEG support" ON IF (NOT ANDROID AND NOT IOS)) OCV_OPTION(WITH_GSTREAMER "Include Gstreamer support" ON IF (UNIX AND NOT APPLE AND NOT ANDROID) ) OCV_OPTION(WITH_GTK "Include GTK support" ON IF (UNIX AND NOT APPLE AND NOT ANDROID) )
也就是2.4.9还默认使用电脑中所使用的gstreamer版本，而3.0.0已经默认使用最新的gstreamer1.0了(今天是2015.5.5，最新gstreamer为1.0)。
到此，可以发现有两个解决方法：
1，在cmake时：设置WITH_GSTREAMER_0_10=OFF
2，安装最新gstreamer1.0
因此我决定安装gstreamer1.0。即：
sudo apt-get install libgstreamer1.0-dev libgstreamer-plugins-base1.0-dev
希望可以帮到大家：）。