#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>



#define TRUE 1
#define FALSE 0



int main (int argc, char *argv[])
{
  char line[2000], master_buffer[10000], input_video_filename[1280];
  int i, fd[2], n, process_status, child_pid, bytes_read, total_bytes_read;
  pid_t wpid;

  total_bytes_read = 0;
  memset (&master_buffer[0], 0, sizeof(master_buffer));
  strcpy (&input_video_filename[0], "video.avi");
  if (pipe(fd) < 0)
  {
    printf ("pipe() failed.\n");
    exit (EXIT_FAILURE);
  }
  switch (child_pid = fork())
  {
    case -1:
      printf ("fork() error\n");
      exit (EXIT_FAILURE);
    case 0:                // child
      dup2 (fd[1], 1);     // 0 is STDIN (read), 1 is STDOUT (write)!
      dup2 (STDOUT_FILENO, STDERR_FILENO); // redirect standard error to standard out.
      close (fd[0]);       // the child does not need this end of the pipe 
      execl ("/usr/local/bin/ffprobe", "/usr/local/bin/ffprobe", "-i", &input_video_filename[0], (char *) NULL);
      exit (EXIT_FAILURE); // should not make it here!
    default:               // parent
      close (fd[1]);       // the parent does not need this end of the pipe 
      memset (&line[0], 0, sizeof(line));
      bytes_read = read(fd[0], &line[0], sizeof(line) - 1);
      while (bytes_read > 0)
      {
        line[bytes_read] = '\0';
        total_bytes_read = total_bytes_read + bytes_read;
        if (total_bytes_read < (sizeof(master_buffer) - 1))
        {
          strcat (master_buffer, line);
        }
        else
        {
          printf ("Exceeded master buffer size\n");
        }
        bytes_read = read(fd[0], line, sizeof(line) - 1);
      }
      wpid = waitpid (child_pid, &process_status, 0);
      if (wpid < 0)
      {
        printf ("waitpid error\n");
        exit (EXIT_FAILURE);
      }
    break;
  }
  for (i = 0; i < total_bytes_read; i++)
  {
    putchar (master_buffer[i]);
  }
}