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• Building FFmpeg for Android

  13 juin 2013, par varevarao

  I've spent almost a week on this now, trying to get FFmpeg "Angel"/"Happiness" to build for Android.
  I've tried build scripts from all over the internet to no avail. I got closest was using this. As the author himself says the script doesn't work for newer versions of FFmpeg due to this bug, which has been dismissed on that ticket saying "I found a Makefile that does it." This was dis-heartening, being the only post on all of the vast Google world that was anywhere close to my problem.
  So, question time :

  Is there a way to get around the above bug ? I'm trying to use the newest ffmpeg API, and "Love" is just giving me "undefined reference" errors while trying to use av_encode_video2(), and av_free_frame(). The code I was working on the lines of is at the ffmpeg git repo, under /doc/examples/decoding_encoding.c (the function starting on line 338).

  Update : So they've done away with codec_names.sh in "Angel". Sorry didn't notice that before, but the problem persists in a different avatar now. With every build attempt the compiler throws a certain

  start ndk-building...
  
  /home/<user>/android-ndk/build/core/build-binary.mk:41: *** target file `clean&#39; has both : and :: entries.  Stop.
  
  </user>

  Say whatnow !?

• Cannot get libav custom IO to work for jpg image file

  24 octobre 2012, par Bloodwolf

  I am trying to create a custom input stream. However, avformat_open_input
  fails with a random error value. I would appreciate it if someone can tell
  me what is it that I am doing wrong. Here is the simplified code.

  Thank you in advance for your help.

  #define BUFSIZE (4 * 1024)
  
  
  
  static int ReadPacket(void* opaque, uint8_t* buf, int bufsize) 
  
  {
  
      FILE* file = (FILE*) opaque;
  
  
  
      int len = fread(buf, 1, bufsize, file);
  
      return len;
  
  }
  
  
  
  
  
  int main(int argc, char* argv[]) 
  
  {
  
  
  
      av_register_all();
  
      // av_log_set_level(AV_LOG_DEBUG);
  
  
  
      const char* fileName = "/home/alan/sample.jpg";
  
      FILE* file = fopen(fileName, "rb");
  
  
  
      unsigned char* buffer = (unsigned char*) av_malloc(BUFSIZE);
  
  
  
      AVIOContext* avContext = avio_alloc_context(buffer, BUFSIZE, 1, file,ReadPacket, NULL, NULL);
  
  
  
      AVFormatContext* pFormatCtx = avformat_alloc_context();
  
      pFormatCtx->pb = avContext;
  
  
  
      int val = avformat_open_input(&pFormatCtx, fileName, NULL, NULL);
  
      if (val != 0) 
  
      {
  
          printf("Open input failed. Err: %d\n", val);
  
          pFormatCtx = 0; // it is already freed
  
          av_free(avContext);
  
          av_free(buffer);
  
          fclose(file);
  
          return -1;
  
      }
  
  }

  But if I replace the fileName by "/home/alan/demo.avi", it works..

• building opencv, got undefined reference to avformat_network_init error

  2 décembre 2014, par Chan Kim

  I am using CentOS6.5, I downloaded opencv-2.4.9, made build directory, and under there, ran ’cmake ..’ and ’make’. During the make run, I got this error message.

  

  I found avformat_network_init in ffmpeg source, I installed ffmpeg once in my home and then to /usr/lib. but I don’t know how to tell cmake where ffmpeg is installed (include header and library).
  Now I see some *.so files from ffmpeg under /usr/lib64. but why can’t cmake find the ffmpeg location ?
  Thanks in advance.