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• OpenCV3.1 compilation error 'ffmpeg/avformat.h' file not found

  15 décembre 2016, par aquagremlin

  On MacOS 10.9.5 Mavericks. I used homebrew to install Python, cmake, ffmpeg.
  Entering ffmpeg in terminal shows it is installed.
  I downloaded Opencv3 and opencv_contrib

  Then cmake with this :

  cmake -D CMAKE_BUILD_TYPE=RELEASE \
  
      -D WITH_CUDA=OFF -D CMAKE_INSTALL_PREFIX=/Users/stefan/Downloads/opencv-3.1.0dl/build \
  
      -D PYTHON2_LIBRARIES=/usr/local/Cellar/python/2.7.10/Frameworks/Python.framework/Versions/2.7/bin \
  
      -D PYTHON2_PACKAGES_PATH=~/.virtualenvs/cv/lib/python2.7/site-packages \
  
      -D PYTHON2_NUMPY_INCLUDE_DIRS=~/.virtualenvs/cv/lib/python2.7/site-packages/numpy/core/include \
  
      -D PYTHON2_INCLUDE_DIR=/usr/local/Frameworks/Python.framework/Headers \
  
      -D INSTALL_PYTHON_EXAMPLES=ON -D WITH_TBB=ON  -D INSTALL_C_EXAMPLES=ON \
  
      -D FFMPEG_INCLUDE_DIR=/usr/local/Cellar/ffmpeg/3.0.2/include \
  
      -D FFMPEG_LIB_DIR=/usr/local/Cellar/ffmpeg/3.0.2/lib \
  
      -D BUILD_EXAMPLES=ON \
  
      -D OPENCV_EXTRA_MODULES_PATH=~/Downloads/opencv_contrib-3.0.0/modules ..

  Terminal output included this :

  --   Video I/O:
  
  --     DC1394 1.x:                  NO
  
  --     DC1394 2.x:                  NO
  
  --     FFMPEG:                      YES
  
  --       codec:                     YES (ver 57.24.102)
  
  --       format:                    YES (ver 57.25.100)
  
  --       util:                      YES (ver 55.17.103)
  
  --       swscale:                   YES (ver 4.0.100)
  
  --       resample:                  YES (ver 3.0.0)
  
  --       gentoo-style:              YES

  But CMakeError.log had this as its only error :

  ffmpeg/avformat.h file not found

  The file does exist at

  /usr/local/Cellar/ffmpeg/3.0.2/include/libavformat/avformat.h

  I do not understand why I am getting this error if I properly specified the FFMPEG include directories in the cmake command. Also the variables FMPEG_INCLUDE_DIR and FFMPEG_LIB_DIR do not exist in the file, CMakeLists.txt.
  Does that make my use of those variables in the cake command useless ?

• While working with ffmpeg : Created function in C file and after compilation with NDK accessing from android activity, getting signal 11 error

  30 mai 2016, par Dayanand Lande

  After successfully fire command ndk-build I got .so file in my libs folder, then after some changes in gradle file I got native_libs.xml .idea/libraries folder.

  Now I am accessing c function from my java code/ android activity. I am getting signal 11 error

  My code is

  C file

  #include 
  
  #include <android></android>log.h>
  
  #include 
  
  
  
  #include "libavcodec/avcodec.h"
  
  #include "libavformat/avformat.h"
  
  
  
  #define LOG_TAG "mylib"
  
  #define LOGI(...)  __android_log_print(ANDROID_LOG_INFO, LOG_TAG, __VA_ARGS__)
  
  #define LOGE(...)  __android_log_print(ANDROID_LOG_ERROR, LOG_TAG, __VA_ARGS__)
  
  
  
  
  
  //JNIEXPORT jint JNICALL Java_com_xxx_xxx_activities_SplashActivity_logFileInfo(JNIEnv * env, jobject this, jstring filename);
  
  
  
  jint Java_com_xxx_xxx_activities_TutorialsActivity_logFileInfo(JNIEnv * env, jobject this, jstring filename)
  
  {
  
      av_register_all();
  
  
  
      AVFormatContext *pFormatCtx;
  
      const jbyte *str;
  
      str = (*env)->GetStringUTFChars(env, filename, NULL);
  
  
  
      if(avformat_open_input(&amp;pFormatCtx, str, NULL, NULL)!=0)
  
      {
  
          LOGE("Can't open file '%s'\n", str);
  
          return 1;
  
      }
  
      else
  
      {
  
          LOGI("File was opened\n");
  
          LOGI("File '%s', Codec %s",
  
              pFormatCtx->filename,
  
              pFormatCtx->iformat->name
  
          );
  
      }
  
      return 0;
  
  }

  Loading and try to access method in java code is

  private static native int logFileInfo(String filename);
  
  
  
  
  
      static {
  
          System.loadLibrary("framegrabber");
  
      }

  In OnCreate of activity

  logFileInfo(file.getAbsolutePath());

  Finally error at point logFileInfo(file.getAbsolutePath()); is

  A/libc: Fatal signal 11 (SIGSEGV), code 1, fault addr 0x106e in tid 8905 (Thread-20972)

  Please replay if you have any solution, Thanking in advance.

• FFmpeg compilation with encoder x264 not found Windows

  23 novembre 2016, par Bernhard Lutz

  FFmpeg compilation with encoder x264 not found Windows

  I am trying to compile FFmpeg with several encoder (x264, NVENC). I already
  managed to compile FFmpeg with MinGW and also x264 but I do not know how I can
  tell where my compiled encoders are.

  I have a folder where my FFmpeg sources are and in this directory I have my
  compiled x264 encoder in a subfolder called x264.

  OS : Windows 10

  Compiler : MinGW