Add DisplayRatioFixer Frame filter

src/FFMpeg/Filters/Frame/DisplayRatioFixerFilter.php

@@ -0,0 +1,58 @@
+<?php
+
+/*
+ * This file is part of PHP-FFmpeg.
+ *
+ * (c) Alchemy <dev.team@alchemy.fr>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace FFMpeg\Filters\Frame;
+
+use FFMpeg\Exception\RuntimeException;
+use FFMpeg\Media\Frame;
+
+class DisplayRatioFixerFilter implements FrameFilterInterface
+{
+    /** @var integer */
+    private $priority;
+
+    public function __construct($priority = 0)
+    {
+        $this->priority = $priority;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getPriority()
+    {
+        return $this->priority;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function apply(Frame $frame)
+    {
+        $dimensions = null;
+        $commands = array();
+
+        foreach ($frame->getVideo()->getStreams() as $stream) {
+            if ($stream->isVideo()) {
+                try {
+                    $dimensions = $stream->getDimensions();
+                    $commands[] = '-s';
+                    $commands[] = $dimensions->getWidth() . 'x' . $dimensions->getHeight();
+                    break;
+                } catch (RuntimeException $e) {
+
+                }
+            }
+        }
+
+        return $commands;
+    }
+}