Centos opencv3.0 ffmpeg 的兼容性

從最新的 ffmpeg 上拉下來的最新代碼(FFmpeg 2.7.2 "Nash") 和Opencv3.0 做兼容性，編譯。

出現如下錯誤：

In file included from /home/share/opencv/opencv3/modules/videoio/src/cap_ffmpeg.cpp:45:
/home/share/opencv/opencv3/modules/videoio/src/cap_ffmpeg_impl.hpp: In member function ‘void CvCapture_FFMPEG::close()’:
/home/share/opencv/opencv3/modules/videoio/src/cap_ffmpeg_impl.hpp:317: error: ‘avcodec_free_frame’ was not declared in this scope
/home/share/opencv/opencv3/modules/videoio/src/cap_ffmpeg_impl.hpp: In member function ‘bool CvCapture_FFMPEG::open(const char*)’:
/home/share/opencv/opencv3/modules/videoio/src/cap_ffmpeg_impl.hpp:632: error: ‘avcodec_alloc_frame’ was not declared in this scope
/home/share/opencv/opencv3/modules/videoio/src/cap_ffmpeg_impl.hpp:635: error: ‘PIX_FMT_BGR24’ was not declared in this scope
/home/share/opencv/opencv3/modules/videoio/src/cap_ffmpeg_impl.hpp: In member function ‘bool CvCapture_FFMPEG::retrieveFrame(int, unsigned char**, int*, int*, int*, int*)’:

看了下代碼, 在 FFmpeg 2.7.2 "Nash" 中已經取消了 avcodec_free_frame 這樣的幀處理接口。

看來 ffmpeg的版本 還需要回歸 FFmpeg 2.6.4 "Grothendieck".

編譯到 26%, 出現 gcc 版本兼容問題。

[ 26%] Building CXX object modules/core/CMakeFiles/opencv_perf_core.dir/perf/perf_cvround.cpp.o
Linking CXX executable ../../bin/opencv_perf_core
../../lib/libopencv_core.so.3.0.0: undefined reference to `parallel_pthreads_set_threads_num(int)'
../../lib/libopencv_core.so.3.0.0: undefined reference to `parallel_pthreads_get_threads_num()'
../../lib/libopencv_core.so.3.0.0: undefined reference to `parallel_for_pthreads(cv::Range const&, cv::ParallelLoopBody const&, double)'

更改源碼的函數聲明方式:

namespace cv
		{
		ParallelLoopBody::~ParallelLoopBody() {}
		+#if defined HAVE_PTHREADS && HAVE_PTHREADS
		+ void parallel_for_pthreads(const cv::Range& range, const cv::ParallelLoopBody& body, double nstripes);
		+ size_t parallel_pthreads_get_threads_num();
		+ void parallel_pthreads_set_threads_num(int num);
		+#endif
		}

#elif defined HAVE_PTHREADS
		- void parallel_for_pthreads(const Range& range, const ParallelLoopBody& body, double nstripes);
		+
		parallel_for_pthreads(range, body, nstripes);
		#else

#elif defined HAVE_PTHREADS
		- size_t parallel_pthreads_get_threads_num();
		-
		return parallel_pthreads_get_threads_num();
		#else
		@@ -424,8 +428,6 @@ void cv::setNumThreads( int threads )
		#elif defined HAVE_PTHREADS
		- void parallel_pthreads_set_threads_num(int num);
		-
		parallel_pthreads_set_threads_num(threads);
		#endif