function removeArtwork($file)
 {
     $cmd = 'metaflac --remove --block-type=PICTURE "' . $file . '"';
     $res = \GlobalMethods::openProcess($cmd);
     if ($res !== FALSE) {
         //As of this writing, metaflac returns an exit status of
         //zero (which cannot necessarily be relied upon on Windows)
         //and does not produce any output on success. The latter fact is
         //far more reliable than the exit status.
         if ($res['stdOut'] == '' && $res['stdErr'] == '') {
             return array('result' => TRUE, 'error' => NULL);
         } else {
             return array('result' => FALSE, 'error' => 'The call to `metaflac` produced output, which indicates an error condition: ' . \Utility::varToString($res));
         }
     } else {
         return array('result' => FALSE, 'error' => 'The process could not be opened: ' . $cmd);
     }
 }
 /**
  * Important: NEVER call this function on a "master" file, as it removes the
  * artwork from THAT file (and not a copy)!
  * @param string $file
  * @param array $tagData
  * @param boolean $allowBlank
  * @param string $coverFile
  * @return multitype:boolean string |multitype:boolean NULL
  */
 function transcodeFlacToAlac($file, $tagData = array(), $allowBlank = FALSE, $coverFile = NULL)
 {
     //In avconv version 9.16 (and possibly earlier), embedded artwork with a
     //width or height that is not divisible by 2 will cause a failure, e.g.:
     //"width not divisible by 2 (1419x1419)". So, we must strip any "odd" artwork.
     //It's entirely possible that artwork was not copied in earlier versions, so
     //this error did not occur.
     $r = $this->tagger->removeArtwork($file);
     $cmd1 = 'avconv -i';
     //Tag data is copied automatically. Nice!!!
     $pathParts = pathinfo($file);
     $outfile = $pathParts['dirname'] . DIRECTORY_SEPARATOR . $pathParts['filename'] . '.m4a';
     $cmd1 .= ' "' . $file . '" -acodec alac "' . $outfile . '"';
     $r1 = \GlobalMethods::openProcess($cmd1);
     if ($r1['exitCode'] == 0) {
         //Write the cover artwork into the file, and fail gracefully.
         //Note the unconventional letter-case of the executable name and its options
         //(which are indeed case-sensitive).
         if (is_string($coverFile) && strlen($coverFile) > 0) {
             $cmd2 = 'AtomicParsley "' . $outfile . '" --artwork "' . $coverFile . '" --overWrite';
             $r2 = \GlobalMethods::openProcess($cmd2);
             if ($r2['exitCode'] != 0) {
                 $e = 'The FLAC file was transcoded to an ALAC file successfully, but the album artwork could not be embedded; the command was: "' . $cmd2 . '"';
                 \GlobalMethods::logCriticalError($e);
             }
         }
     } else {
         $error = 'The FLAC file could not be transcoded to an ALAC file; the command was: "' . $cmd1 . '"';
         return array('result' => FALSE, 'error' => $error);
     }
     return array('result' => TRUE, 'error' => NULL);
 }