diff --git a/cutvideo b/cutvideo
index ee10eeb..a3d4ed9 100755
--- a/cutvideo
+++ b/cutvideo
@@ -16,6 +16,7 @@ use Symfony\Component\Console\SingleCommandApplication;
     ->addArgument('file', InputArgument::REQUIRED, 'The video file to cut.')
     ->addArgument('start', InputArgument::REQUIRED, 'The starting point of the video')
     ->addArgument('end', InputArgument::REQUIRED, 'The end point of the video')
+    ->addOption('force', 'f', InputOption::VALUE_NONE, 'Force generation, even if target already exists.')
     ->addOption('ad', null, InputOption::VALUE_IS_ARRAY | InputOption::VALUE_REQUIRED, 'Start and end of ads, separate start and end via "/".', [])
     ->setCode(new Command())
     ->run();
diff --git a/src/Command.php b/src/Command.php
index a494ee8..d4818d8 100644
--- a/src/Command.php
+++ b/src/Command.php
@@ -44,6 +44,14 @@ class Command
             $input->getOption('ad')
         );
 
+        if (
+            file_exists($videoInfo->getTargetFilePath())
+            && $input->getOption('force') === false
+        ) {
+            $this->io->error('Target file already exist, "-f" to force generation.');
+            return 1;
+        }
+
         $cutting = new Cutting($videoInfo);
 
         $this->io->title('Generating temp cutted video files.');
diff --git a/src/Cutting.php b/src/Cutting.php
index ba70263..3988c09 100644
--- a/src/Cutting.php
+++ b/src/Cutting.php
@@ -65,7 +65,7 @@ class Cutting
     public function getCommandForGeneratingMetadata(): Process
     {
         $command = sprintf(
-            'ffmpeg -i %s -f ffmetadata %s',
+            'ffmpeg -y -i %s -f ffmetadata %s',
             escapeshellarg($this->video->getOriginalFilename()),
             escapeshellarg($this->getMetadataFilename())
         );
@@ -94,7 +94,7 @@ class Cutting
     public function getCommandForGeneratingVideo(): Process
     {
         $command = sprintf(
-            'ffmpeg -f concat -safe 0 -i %s -c copy'
+            'ffmpeg -y -f concat -safe 0 -i %s -c copy'
             . ' -f ffmetadata -i %s -c copy -map_metadata 1'
             // . ' -metadata Title="$episodeTitle"'
             . ' %s',
diff --git a/tests/Unit/CuttingTest.php b/tests/Unit/CuttingTest.php
index 8a85605..a36b0f7 100644
--- a/tests/Unit/CuttingTest.php
+++ b/tests/Unit/CuttingTest.php
@@ -132,7 +132,7 @@ class CuttingTest extends TestCase
         $command = $subject->getCommandForGeneratingMetadata();
 
         static::assertSame(
-            "ffmpeg -i 'Some-Video.mp4' -f ffmetadata '/tmp/Some-Video-metadata.txt'",
+            "ffmpeg -y -i 'Some-Video.mp4' -f ffmetadata '/tmp/Some-Video-metadata.txt'",
             $command->getCommandLine()
         );
     }
@@ -236,7 +236,7 @@ class CuttingTest extends TestCase
         $command = $subject->getCommandForGeneratingVideo();
 
         static::assertSame(
-            'ffmpeg -f concat -safe 0 -i \'/tmp/Series-Name_Series-01_episode-title-01-concat.txt\' -c copy'
+            'ffmpeg -y -f concat -safe 0 -i \'/tmp/Series-Name_Series-01_episode-title-01-concat.txt\' -c copy'
             . ' -f ffmetadata -i \'/tmp/Series-Name_Series-01_episode-title-01-metadata.txt\' -c copy -map_metadata 1'
             // . ' -metadata Title="$episodeTitle"'
             . ' \'Series-Name/Series-01/10-episode title.mp4\'',