Add Audio and Video interfaces

src/FFMpeg/Format/VideoFormat.php

@@ -0,0 +1,18 @@
+<?php
+
+namespace FFMpeg\Format;
+
+interface VideoFormat
+{
+
+    public function getWidth();
+
+    public function getHeight();
+
+    public function getFrameRate();
+
+    public function getVideoCodec();
+
+    public function getGOPSize();
+
+}