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• Writing numpy arrays using cv2 VideoWriter

  8 juillet 2015, par JustInTime

  I have a problem with writing a toy example video using opencv2.3.1 VideoWriter, here is how I do it :

  writer = cv2.VideoWriter('test1.avi',cv.CV_FOURCC('P','I','M','1'),25,(640,480))
  
  for i in range(1000):
  
      x = np.random.randint(10,size=(480,640)).astype('uint8')
  
      writer.write(x)
  
  #del writer (with or without tested)

  I tried every possible combination resulting with a 0 bytes file if the extension was mpg, and 5.5kb if it was avi. I should say that some pointed out that I should build the ffmpeg library from source and not apt-get it. Well I did that on a fresh machine based on the help of this site http://vinayhacks.blogspot.com/2011/11/installing-opencv-231-with-ffmpeg-on-64.html. which also presented an error while compiling opencv(the error was related to ffmpeg). Now I am really out of ideas, How to generate a video using OPENCV ?

  Thanks in advance

• Writing numpy arrays using cv2 VideoWriter

  8 juillet 2015, par JustInTime

  I have a problem with writing a toy example video using opencv2.3.1 VideoWriter, here is how I do it :

  writer = cv2.VideoWriter('test1.avi',cv.CV_FOURCC('P','I','M','1'),25,(640,480))
  
  for i in range(1000):
  
      x = np.random.randint(10,size=(480,640)).astype('uint8')
  
      writer.write(x)
  
  #del writer (with or without tested)

  I tried every possible combination resulting with a 0 bytes file if the extension was mpg, and 5.5kb if it was avi. I should say that some pointed out that I should build the ffmpeg library from source and not apt-get it. Well I did that on a fresh machine based on the help of this site http://vinayhacks.blogspot.com/2011/11/installing-opencv-231-with-ffmpeg-on-64.html. which also presented an error while compiling opencv(the error was related to ffmpeg). Now I am really out of ideas, How to generate a video using OPENCV ?

  Thanks in advance

• ffmpeg converter php script not working as expected

  8 juillet 2012, par mintuz

  I have been looking into a php video converter method and have followed a tutorial on how to get one set up. It can read the source video file fine, my script shows an md5, fps rate, bit rate etc but it does not create the destination file. Any suggestions on why my code is not working.

  I have tried both system() ; and exec() ; commands, both do not work and safe_mode is off. I have also tried a more basic command

  "/usr/bin/ffmpeg -i /home/mintuz/video.avi /var/www/video.flv"

  This command however works through the terminal.

  <?php 
  
  define('FFMPEG_LIBRARY', '/usr/bin/ffmpeg');
  
  
  
  //ALTER STUFF HERE
  
  $srcFile = "/home/mintuz/video.avi"; //source file
  
  $destFile = "/var/www/video.flv"; //destination file
  
  
  
  
  
  if (strpos($srcFile, '.avi'))
  
  {
  
      $type = "avi";
  
      echo $type;
  
  }
  
  
  
  if (strpos($srcFile, '.mp4'))
  
  {
  
      $type = "mp4";
  
      echo $type;
  
  }
  
  
  
  if (strpos($srcFile, '.mov'))
  
  {
  
      $type = "mov";
  
      echo $type;
  
  }
  
  
  
  //-------------------------------------------------------------------------------------------------------------------
  
  // Create our FFMPEG-PHP class 
  
  $ffmpegObj = new ffmpeg_movie($srcFile); 
  
  
  
  // Save our needed variables 
  
  $srcWidth = makeMultipleTwo($ffmpegObj->getFrameWidth()); 
  
  echo "<br />".$srcWidth."<br />";
  
  
  
  $srcHeight = makeMultipleTwo($ffmpegObj->getFrameHeight()); 
  
  echo $srcHeight."<br />";
  
  
  
  $srcFPS = $ffmpegObj->getFrameRate();
  
  echo $srcFPS."<br />"; 
  
  
  
  $srcAB = intval($ffmpegObj->getAudioBitRate()/1000);  
  
  $srcAR = $ffmpegObj->getAudioSampleRate();  
  
  
  
  // Call our convert using exec() 
  
  $cmd = FFMPEG_LIBRARY." -i ".$srcFile." -ar ".$srcAR." -ab ".$srcAB." -f flv -s ".$srcWidth."x".$srcHeight." ".$destFile;
  
  system($cmd); 
  
  
  
  echo "Source File MD5 : ".md5_file($srcFile)."<br />";
  
  echo "Destination File MD5 : ".md5_file($destFile);
  
  
  
  // Make multiples function 
  
  function makeMultipleTwo ($value) 
  
  { 
  
      $sType = gettype($value/2); 
  
      if($sType == "integer") 
  
      { 
  
          return $value; 
  
      } else { 
  
          return ($value-1); 
  
      } 
  
  }
  
  ?>