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diff --git a/libraries/phpvideotoolkit/adapters/ffmpeg-php/php-reader/src/ISO14496/Box/STZ2.php b/libraries/phpvideotoolkit/adapters/ffmpeg-php/php-reader/src/ISO14496/Box/STZ2.php
new file mode 100644
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--- /dev/null
+++ b/libraries/phpvideotoolkit/adapters/ffmpeg-php/php-reader/src/ISO14496/Box/STZ2.php
@@ -0,0 +1,109 @@
+<?php
+/**
+ * PHP Reader Library
+ *
+ * Copyright (c) 2008 The PHP Reader Project Workgroup. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *  - Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ *  - Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *  - Neither the name of the project workgroup nor the names of its
+ *    contributors may be used to endorse or promote products derived from this
+ *    software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * @package    php-reader
+ * @subpackage ISO 14496
+ * @copyright  Copyright (c) 2008 The PHP Reader Project Workgroup
+ * @license    http://code.google.com/p/php-reader/wiki/License New BSD License
+ * @version    $Id: STZ2.php 92 2008-05-10 13:43:14Z svollbehr $
+ */
+
+/**#@+ @ignore */
+require_once("ISO14496/Box/Full.php");
+/**#@-*/
+
+/**
+ * The <i>Sample Size Box</i> contains the sample count and a table giving the
+ * size in bytes of each sample. This allows the media data itself to be
+ * unframed. The total number of samples in the media is always indicated in the
+ * sample count.
+ *
+ * There are two variants of the sample size box. This variant permits smaller
+ * than 32-bit size fields, to save space when the sizes are varying but small.
+ * One of the boxes must be present; the {@link ISO14496_Box_STSZ another
+ * variant} is preferred for maximum compatibility.
+ *
+ * @package    php-reader
+ * @subpackage ISO 14496
+ * @author     Sven Vollbehr <svollbehr@gmail.com>
+ * @copyright  Copyright (c) 2008 The PHP Reader Project Workgroup
+ * @license    http://code.google.com/p/php-reader/wiki/License New BSD License
+ * @version    $Rev: 92 $
+ */
+final class ISO14496_Box_STZ2 extends ISO14496_Box_Full
+{
+  /** @var Array */
+  private $_sampleSizeTable = array();
+  
+  /**
+   * Constructs the class with given parameters and reads box related data from
+   * the ISO Base Media file.
+   *
+   * @param Reader $reader The reader object.
+   */
+  public function __construct($reader, &$options = array())
+  {
+    parent::__construct($reader, $options);
+    
+    $this->_reader->skip(3);
+    $fieldSize = $this->_reader->readInt8();
+    $sampleCount = $this->_reader->readUInt32BE();
+    $data = $this->_reader->read
+      ($this->getOffset() + $this->getSize() - $this->_reader->getOffset());
+    for ($i = 1; $i <= $sampleCount; $i++) {
+      switch ($fieldSize) {
+      case 4:
+        $this->_sampleSizeTable[$i] =
+          (($tmp = Transform::fromInt8($data[$i - 1])) >> 4) & 0xf;
+        if ($i + 1 < $sampleCount)
+          $this->_sampleSizeTable[$i++] = $tmp & 0xf;
+        break;
+      case 8:
+        $this->_sampleSizeTable[$i] = Transform::fromInt8($data[$i - 1]);
+        break;
+      case 16:
+        $this->_sampleSizeTable[$i] =
+          Transform::fromUInt16BE(substr($data, ($i - 1) * 2, 2));
+        break;
+      }
+    }
+  }
+  
+  /**
+   * Returns an array of sample sizes specifying the size of a sample, indexed
+   * by its number.
+   *
+   * @return Array
+   */
+  public function getSampleSizeTable()
+  {
+    return $this->_sampleSizeTable;
+  }
+}