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• shared library built with g++ compile is works and with automake compile can not be used

  23 avril 2013, par user2310175

  I'm building a shared libraries on CentOS 6.2.
  The shared library will be build have some cpp files,headers,c shared libraries
  and ffmpeg.The shared library is used to convert videos. When i use the g++ compile like this :

  g++    DataType.h    h264function.h  h264function.cpp videoconvert.h videoconvert.cpp      stdafx.h stdafx.cpp YV12toRGB.h YV12toRGB.cpp -lMPCtrl -lavcodec -lavformat -lavutil -   lhcnetsdk -lPlayCtrl -lpthread -fPIC -shared -o libtest.so

  It can work properly,and the video can be converted as standard h264 coded.That seems the files used for building the library is

  good.But when i use the autotools to make the library,it can not work correct.Here is my configure.in and Makefile.am :

  Makefile.am :

  prefix=/usr
  
  lib_LTLIBRARIES=libhikvisiontranso.la
  
  
  
  libhikvisiontranso_la_SOURCES=stdafx.h stdafx.cpp videoconvert.h videoconvert.cpp 
  
  h264function.h h264function.cpp YV12toRGB.h YV12toRGB.cpp DataType.h 
  
  
  
  libhikvisiontranso_la_LDFLAGS=-avoid-version -shared 
  
  libhikvisiontranso_la_LIBADD=-lpthread -lMPCtrl -lhcnetsdk -lPlayCtrl -lavformat -    lavcodec -lavutil
  
  ACLOCAL_AMFLAGS= -I m4

  configure.in :

  #                                               -*- Autoconf -*-
  
  # Process this file with autoconf to produce a configure script.
  
  
  
  AC_PREREQ([2.63])
  
  AC_INIT([hikvisiontranso],[1.0], [songxiawuren@gmail.com])
  
  AM_INIT_AUTOMAKE([libhikvisiontranso.so],[1.0])
  
  AC_CONFIG_SRCDIR([DataType.h])
  
  AC_CONFIG_HEADERS([config.h])
  
  AC_CONFIG_MACRO_DIR([m4])
  
  AT_INIT
  
  # Checks for programs.
  
  AC_PROG_CXX
  
  AC_PROG_CC
  
  
  
  # Checks for libraries.
  
  
  
  # Checks for header files.
  
  AC_CHECK_HEADERS([inttypes.h limits.h stddef.h stdint.h stdlib.h string.h])
  
  
  
  # Checks for typedefs, structures, and compiler characteristics.
  
  AC_HEADER_STDBOOL
  
  AC_C_INLINE
  
  AC_TYPE_INT16_T
  
  AC_TYPE_INT32_T
  
  AC_TYPE_INT64_T
  
  AC_TYPE_INT8_T
  
  AC_TYPE_SIZE_T
  
  AC_TYPE_UINT16_T
  
  AC_TYPE_UINT32_T
  
  AC_TYPE_UINT64_T
  
  AC_TYPE_UINT8_T
  
  
  
  # Checks for library functions.
  
  AC_FUNC_MALLOC
  
  AC_PROG_LIBTOOL
  
  AC_CONFIG_FILES([Makefile])
  
  AC_OUTPUT

  The wrong output is :

  SDL Init
  
  
  
  init console=1
  
  
  
  Output #0, avi, to '/home/ningge/Desktop/HaikangDvr.avi':
  
  
  
  Stream #0.0: Invalid Codec type -1
  
  
  
  Height = 576; Width = 704;totalfram=90000
  
  
  
  Segmentation fault (core dumped)

  The right is :

  SDL Init
  
  
  
  init console=1
  
  
  
  Output #0, avi, to '/home/ningge/Desktop/HaikangDvr.avi':
  
  
  
  Stream #0.0: Video: mpeg4, yuv420p, 704x576, q=2-31, 200 kb/s, 90k tbn, 25 tbc
  
  
  
  Height = 576; Width = 704;totalfram=90000
  
  
  
  CSDLInit goOut 

  I hope someone can help me to find what's wrong with automake.

• ffmpeg in child process doesn't exit when parent closes pipe

  28 mars 2013, par user2221129

  This code snippet is from a pthread process. It is responsible for reading configuration/options to pass to ffmpeg. The data piped to ffmpeg is coming in on a ring buffer of video frames (as a proof of concept, in the final implementation these would be coming from a camera device). The parent writes to the child via a pipe established with dup2. The problem I'm having is that most of the time, the ffmpeg process doesn't seem to recognize the pipe has been closed by the parent (as strace shows the ffmpeg is in read). There are probably some unhandled mutex situations.

  #define CHILD_READ  writepipe[0]
  
  #define PARENT_WRITE    writepipe[1]
  
  #define MAX_VIDEO_BUFFERS 30
  
  
  
  static int last_frame_written = -1;
  
  static int buffer_size = -1;
  
  static void *video_buffer[MAX_VIDEO_BUFFERS];
  
  
  
  #define MAXTHREADS 2
  
  static pthread_t thread[MAXTHREADS];
  
  static int sigusr[MAXTHREADS];
  
  static int sigusr_thread[MAXTHREADS];
  
  
  
  #define MAXPARAMETERS 100
  
  
  
  void* encoder_thread(void *ptr)
  
  {
  
      int param;
  
      const char **parameters = new const char* [MAXPARAMETERS];
  
      ssize_t bytes_written_debug = 0;
  
  
  
      int writepipe[2] = {-1,-1};
  
      int last_frame_read = -1;
  
      pid_t   childpid;
  
  
  
      // xxx
  
      if ( 0 != pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL) )
  
      {
  
          fprintf(stderr,"pthread_setcancelstate could not be set\n");
  
      }
  
  
  
      param = *(int*)ptr;
  
      fprintf(stderr,"param = %d\n", param);
  
  
  
      switch (param)
  
      {
  
          ...read config file and populate parameters for child call...
  
      }
  
  
  
      while ( last_frame_written == -1 )
  
      {
  
          fprintf(stderr,"ENCODER THREAD WAITING\n");
  
          sleep(1);
  
      }
  
  
  
      if ( pipe(writepipe) < 0 )
  
      {
  
          ...handle error case...
  
      }
  
  
  
  
  
      if ( (childpid = fork()) < 0)
  
      {
  
          fprintf(stderr,"child failed\n");
  
      }
  
      else if ( 0 == childpid )   /* in the child */
  
      {
  
          dup2(CHILD_READ,  STDIN_FILENO);
  
          //close(CHILD_READ); // doesn't seem to matter
  
          close(PARENT_WRITE);
  
  
  
          execv("/usr/bin/ffmpeg",(char **)parameters);
  
          return;
  
      }
  
      else                /* in the parent */
  
      {
  
          fprintf(stderr,"THREAD CHILD PID: %d\n",childpid);
  
          close(CHILD_READ);
  
  
  
          while ( last_frame_written > -1 && 0==sigusr_thread[param] )
  
          {
  
              if ( last_frame_read != last_frame_written )
  
              {
  
                  // send frame to child (ffmpeg)
  
                  last_frame_read = last_frame_written;
  
                  bytes_written_debug = write(PARENT_WRITE,video_buffer[last_frame_read], buffer_size);
  
                  if ( bytes_written_debug < 0 )
  
                  {
  
                      fprintf(stderr, "write error\n");
  
                      break;
  
                  }
  
              }
  
  
  
              usleep(10000); // assume ~100Hz rate
  
          }
  
  
  
  /// Problems begin now: no more data from main process,
  
  /// Shouldn't this close "close" the pipe created with dup2 and hence EOF ffmpeg?
  
          if ( close(PARENT_WRITE) )
  
          {
  
              fprintf(stderr,"\n\nclose failure! wtf?\n\n\n");
  
          }
  
  
  
  // debug sleep:
  
  // waiting 10 sec doesn't seem to help...
  
  // trying to give ffmpeg some time if it needs it
  
          sleep(10);
  
  
  
  // kill never fails here:
  
          if ( !kill(childpid,SIGINT) )
  
          {
  
              fprintf(stderr, "\n\nkill child %d\n", childpid);
  
          }
  
          else
  
          {
  
              fprintf(stderr, "\n\nkill failed for child %d\n", childpid);
  
          }
  
  
  
          fprintf(stderr,"\n\nwaiting\n\n\n");
  
          int status = 0;
  
  
  
  // wait forever (in most cases); ps -axw shows all the ffmpeg's
  
          wait(&status);
  
      }
  
  }
  
  
  
  
  
  
  
  
  
  int main()
  
  {
  
      ...
  
      for ( int i = 0; i < MAXTHREADS; ++i)
  
      {
  
          sigusr[i] = 0;
  
          sigusr_thread[i] = 0;
  
          param[i] = i;
  
          iret = pthread_create( &thread[i], NULL, encoder_thread, (void*) &param[i] );
  
      }
  
      ...
  
  
  
      // Maybe this is important to the pthread signaling?
  
      // Don't think so because thread's SIGINT isn't picked up by signal handler (not shown)
  
      sigemptyset(&set);
  
      sigaddset(&set, SIGHUP);
  
      sigaddset(&set, SIGINT);
  
      sigaddset(&set, SIGUSR1);
  
      sigaddset(&set, SIGUSR2);
  
      sigaddset(&set, SIGALRM);
  
  
  
      /* block out these signals */
  
      sigprocmask(SIG_BLOCK, &set, NULL);
  
  
  
      ...read file/populate frame buffer until file exhausted...
  
  
  
      fprintf(stderr, "waiting for threads to exit\n");
  
  
  
      for ( int i = 0; i < MAXTHREADS; ++i)
  
      {
  
          sigusr_thread[i] = 1;
  
          pthread_join( thread[i], NULL);
  
      }
  
      fprintf(stderr, "done waiting for threads to exit\n");
  
  
  
      ...
  
  
  
      return 0;
  
  }

  I've embedded comments and questions in the thread's parent code after the frame buffer read/write loop.

  Hope I've provided enough detail - stackoverflow posting noob ! Thank you.

• Apply sound effects on a video file

  31 mars 2013, par talhamalik22

  I am a little miss guided here and it seems i am totally lost. I am developing an android app and its core idea is to develop a video recorder and video player that applies some sound effects on the voice of the people or any sound that it records. Sound effect means that if i make a video of a person who is giving some speech then there should be no effect on video but his/her voice should appear like voice in talking tom cat app. I hope you understand the idea. Similar app is Helium Booth you can check it here. I am trying to use libraries like libSonic, libpd and tried to use XUGGLE too.
  Read somewhere that Xuggle is not really developed for mobile devices so left it. Now what i want is that it should apply this effect on voice on the run time i.e while recording the pitch of the sound should be alterd and saved immediately. And what i am getting with these libraries is that i can apply sound effect after video is recorded. So it means i need to rip the audio from the video and then apply the change in pitch and frequency and again concatenate this audio file with the old video file. And i have no idea how to do it.
  Please show me the right approach and tools if possible.

  Regards