Creation of a pad filters which adds padding (black bars) to a video

src/FFMpeg/Filters/Video/PadFilter.php

@@ -0,0 +1,60 @@
+<?php
+
+/*
+ * This file is part of PHP-FFmpeg.
+ *
+ * (c) Strime <contact@strime.io>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FFMpeg\Filters\Video;
+
+use FFMpeg\Coordinate\Dimension;
+use FFMpeg\Exception\RuntimeException;
+use FFMpeg\Media\Video;
+use FFMpeg\Format\VideoInterface;
+
+class PadFilter implements VideoFilterInterface
+{
+    /** @var Dimension */
+    private $dimension;
+    /** @var integer */
+    private $priority;
+
+    public function __construct(Dimension $dimension, $priority = 0)
+    {
+        $this->dimension = $dimension;
+        $this->priority = $priority;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getPriority()
+    {
+        return $this->priority;
+    }
+
+    /**
+     * @return Dimension
+     */
+    public function getDimension()
+    {
+        return $this->dimension;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function apply(Video $video, VideoInterface $format)
+    {
+        $commands = array();
+
+        $commands[] = '-vf';
+        $commands[] = 'pad=' . $this->dimension->getWidth() . ':' . $this->dimension->getHeight() . ':(' . $this->dimension->getWidth() . '-iw)/2:(' . $this->dimension->getHeight() .'-ih)/2';
+
+        return $commands;
+    }
+}

src/FFMpeg/Filters/Video/VideoFilters.php

@@ -98,6 +98,20 @@ class VideoFilters extends AudioFilters
         return $this;
     }
 
+    /**
+     * Adds padding (black bars) to a video.
+     *
+     * @param Dimension $dimension
+     *
+     * @return VideoFilters
+     */
+    public function pad(Dimension $dimension)
+    {
+        $this->media->addFilter(new PadFilter($dimension));
+
+        return $this;
+    }
+
     public function rotate($angle)
     {
         $this->media->addFilter(new RotateFilter($angle, 30));