From e43da86152e36d78bba3e4e7ddea5a6aad73f8f5 Mon Sep 17 00:00:00 2001
From: Romain Neutron <imprec@gmail.com>
Date: Thu, 5 Sep 2013 11:12:10 +0200
Subject: [PATCH] Fix FiltersCollection::getIterator in case of empty
 collection

---
 src/FFMpeg/Filters/FiltersCollection.php             | 8 ++++++--
 tests/FFMpeg/Tests/Filters/FiltersCollectionTest.php | 6 ++++++
 2 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/src/FFMpeg/Filters/FiltersCollection.php b/src/FFMpeg/Filters/FiltersCollection.php
index d44a880..c91241a 100644
--- a/src/FFMpeg/Filters/FiltersCollection.php
+++ b/src/FFMpeg/Filters/FiltersCollection.php
@@ -47,8 +47,12 @@ class FiltersCollection implements \Countable, \IteratorAggregate
     public function getIterator()
     {
         if (null === $this->sorted) {
-            krsort($this->filters);
-            $this->sorted = call_user_func_array('array_merge', $this->filters);
+            if (0 === count($this->filters)) {
+                $this->sorted = $this->filters;
+            } else {
+                krsort($this->filters);
+                $this->sorted = call_user_func_array('array_merge', $this->filters);
+            }
         }
 
         return new \ArrayIterator($this->sorted);
diff --git a/tests/FFMpeg/Tests/Filters/FiltersCollectionTest.php b/tests/FFMpeg/Tests/Filters/FiltersCollectionTest.php
index 52a1395..5a29008 100644
--- a/tests/FFMpeg/Tests/Filters/FiltersCollectionTest.php
+++ b/tests/FFMpeg/Tests/Filters/FiltersCollectionTest.php
@@ -30,6 +30,12 @@ class FiltersCollectionTest extends TestCase
         $this->assertCount(2, $coll->getIterator());
     }
 
+    public function testEmptyIterator()
+    {
+        $coll = new FiltersCollection();
+        $this->assertInstanceOf('\ArrayIterator', $coll->getIterator());
+    }
+
     public function testIteratorSort()
     {
         $coll = new FiltersCollection();