Add ability to disable -b:v (#767)

* adds ability to disable -b:v

* Fixed a bug in the way the paths to the test files were defined in the AudioConcatenationTest.php file

* Added a test to make sure that a negative kilobit rate returns an exception

* Added a test to check that the -b:v options are not set if the kilo bitrate is set to 0

* Disable 2pass when -b:v is disabled

Co-Authored-By: Philipp Doblhofer <6283313+philipp-doblhofer@users.noreply.github.com>

* Changed the way we call the class FFMpeg\Exception\InvalidArgumentException in tests

* Changed the way we call the class FFMpeg\Exception\InvalidArgumentException in tests

* Updated the README to include this new option

Co-authored-by: Romain Biard <romain.biard@gmail.com>
Co-authored-by: Philipp Doblhofer <6283313+philipp-doblhofer@users.noreply.github.com>

tests/Unit/Media/VideoTest.php

@@ -4,6 +4,7 @@ namespace Tests\FFMpeg\Unit\Media;
 
 use FFMpeg\Exception\RuntimeException;
 use FFMpeg\Media\Video;
+use FFMpeg\Format\Video\X264;
 use Alchemy\BinaryDriver\Exception\ExecutionFailureException;
 use FFMpeg\Format\VideoInterface;
 
@@ -677,6 +678,35 @@ class VideoTest extends AbstractStreamableTestCase
         }
     }
 
+    public function testCaseWhereKiloBitRateIsEqualToZero()
+    {
+        $driver = $this->getFFMpegDriverMock();
+        $ffprobe = $this->getFFProbeMock();
+
+        $pathfile = '/target/destination';
+        $outputPathfile = '/target/file';
+
+        $format = new X264();
+        $format->setKiloBitrate(0);
+
+        $configuration = $this->getMockBuilder('Alchemy\BinaryDriver\ConfigurationInterface')->getMock();
+
+        $driver->expects($this->any())
+            ->method('getConfiguration')
+            ->will($this->returnValue($configuration));
+
+        $driver->expects($this->exactly(1))
+            ->method('command')
+            ->with($this->isType('array'), false, $this->anything())
+            ->will($this->returnCallback(function ($commands, $errors, $listeners) {
+                var_dump($commands);
+                $this->assertTrue(!in_array('-b:v', $commands));
+            }));
+
+        $video = new Video(__FILE__, $driver, $ffprobe);
+        $video->save($format, $outputPathfile);
+    }
+
     public function getClassName()
     {
         return 'FFMpeg\Media\Video';