Recherche avancée

Sur d’autres sites (13986)

• Mingw-w64 - printf does not work

  27 décembre 2013, par Gosha U.

  First I wanted to modificate ffplay according to my requirments. Then I noticed that original ffplay from my build can't play some video files, but it didn't write any message to console. Then I noticed that ffmpeg also don't write any usage message when I run it without params. But it works. If I run it from terminal it's like running asynchronously ! The terminal just shows next row. I mean it asks for a next command. But the ffmpeg process is visible in task manager and it writes the output video file what I had requested !

  I created following souce file. I have modified the Makefile. So it have built the exe-file works just the same way. I have no idea how it can be.

  #include 
  
  #include "cmdutils.h"
  
  
  
  const char program_name[] = "hello";
  
  const int program_birth_year = 2013;
  
  
  
  void show_help_default(const char *opt, const char *arg)
  
  {
  
      printf("zxcvbnm\n");
  
  }
  
  
  
  int main(int argc, char **argv)
  
  {
  
      printf("1234567890\n");
  
      return 0;
  
  }

  And after that I created real hello world app with MinGW-w64 and qmake without eny extra libs. And its printf does not work.

  I want to prevent this behavior.

  I want to make printf working in traditional manner.

  How I build FFmpeg :

  PKG_CONFIG_PATH=/home/developer/workspace/MinGW32fs/lib/pkgconfig/ \
  
  SDL_CONFIG=/home/developer/workspace/MinGW32fs/bin/sdl-config \
  
  ./configure \
  
    --prefix=/home/developer/workspace/MinGW32fs \
  
    --extra-ldflags="-L/home/developer/workspace/MinGW32fs/lib" \
  
    --extra-cflags="-I/home/developer/workspace/MinGW32fs/include" \
  
    --arch=x86 --target-os=mingw32 --cross-prefix=i686-w64-mingw32-  \
  
    --pkg-config=pkg-config   --enable-libtheora --enable-libvorbis --enable-libvpx \
  
    --enable-outdev=sdl --enable-shared --disable-static \
  
    --disable-doc --disable-manpages --disable-podpages
  
  
  
  make

• vp8 : fix PPC assembly and bilinear C code to work if src_stride != dst_stride.

  23 septembre 2013, par Ronald S. Bultje

  vp8 : fix PPC assembly and bilinear C code to work if src_stride != dst_stride.
  Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] libavcodec/ppc/vp8dsp_altivec.c
  • [DH] libavcodec/vp8dsp.c

• Cannot get ffmpeg2.3.3 to work with Opencv2.4.9

  6 septembre 2014, par Siddharthan P R

  I need to open a video file in opencv2.4.9. I used the following code and I got the output :
   !!! Sorry cant find the video file !!!.

  So I figured I need to install ffmpeg first then install opencv.
  So I Uninstalled opencv and ffmpeg then tried to install ffmpeg 2.3.3 properly.
  Here are the methods i tried to install ffmpeg.

  Method 1 :
  sudo apt-get install ffmpeg.

  Method 2 :
  Download (HTTP) : http://ffmpeg.org/releases/ffmpeg-2.3.3.tar.bz2

  Then i typed the following in the terminal after cd to the extracted folder.

  sed -i 's/-lflite"/-lflite -lasound"/' configure && 
  
  
  
  ./configure --prefix=/usr        \
  
              --enable-gpl         \
  
              --enable-version3    \
  
              --enable-nonfree     \
  
              --disable-static     \
  
              --enable-shared      \
  
              --disable-debug      \
  
              --enable-libass      \
  
              --enable-libfdk-aac  \
  
              --enable-libmp3lame  \
  
              --enable-libtheora   \
  
              --enable-libvorbis   \
  
              --enable-libvpx      \
  
              --enable-libx264     \
  
              --enable-x11grab     &&
  
  make &&
  
  gcc tools/qt-faststart.c -o tools/qt-faststart

  Though Method 1 works fine (in just installing ffmpeg), the problem with Method 1 is that i cannot use "./configure —enable-shared" anywhere because i cannot locate the file "configure".

  The problem with method 2 is that it says

  -ERROR: libass not found, after installing libass it says
  
  
  
  -ERROR: libfdk-aac-0.1.3 not found, then
  
  
  
  -ERROR: lame-3.8 not found, then
  
  
  
  -ERROR: libtheora not found, here i really got tired of installing all these packages. I stopped.

  I am really confused how to pull this off : with Method 1 or Method 2 (both seem not to work ). Can i change the ./ configure using method 1 ?

  Any help would be greatly appreciated.

              #include 
  
              #include 
  
  
  
              int main(int argc, char** argv) 
  
              {
  
                  cvNamedWindow("xample2", CV_WINDOW_AUTOSIZE);
  
                  CvCapture* capture = cvCreateFileCapture( "1.mp4" );
  
                  if (!capture)
  
                  {
  
                    std::cout << "!!! Sorry cant find the video file !!!\n";
  
                    return -1; 
  
                  }
  
  
  
                  IplImage* frame;
  
                  while (1) 
  
                  {
  
                      frame = cvQueryFrame(capture);
  
                      if(!frame) 
  
                          break;
  
  
  
                      cvShowImage("xample2", frame);
  
  
  
                      char c = cvWaitKey(33);
  
                      if (c == 27) 
  
                          break;
  
                  }
  
  
  
                  cvReleaseCapture(&capture);
  
                  cvDestroyWindow("xample2");
  
              }