diff --git a/common/src/main/java/ctbrec/recorder/download/VideoLengthDetector.java b/common/src/main/java/ctbrec/recorder/download/VideoLengthDetector.java
index 450c3574..a6d356bb 100644
--- a/common/src/main/java/ctbrec/recorder/download/VideoLengthDetector.java
+++ b/common/src/main/java/ctbrec/recorder/download/VideoLengthDetector.java
@@ -1,5 +1,11 @@
 package ctbrec.recorder.download;
 
+import ctbrec.OS;
+import ctbrec.io.DevNull;
+import ctbrec.io.StreamRedirector;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
 import java.io.ByteArrayOutputStream;
 import java.io.File;
 import java.io.IOException;
@@ -8,20 +14,16 @@ import java.util.Arrays;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
-import ctbrec.OS;
-import ctbrec.io.DevNull;
-import ctbrec.io.StreamRedirector;
-
 public class VideoLengthDetector {
     private static final Logger LOG = LoggerFactory.getLogger(VideoLengthDetector.class);
 
+    private VideoLengthDetector() {
+    }
+
     /**
      * Tries to determine the length of a video file by calling FFmpeg and parsing it's output
      *
-     * @param videoFile
+     * @param videoFile the video file to analyze
      * @return the length as Duration object. The duration is negative, if the length couldn't be determined
      */
     public static Duration getLength(File videoFile) {
@@ -37,7 +39,7 @@ public class VideoLengthDetector {
             String[] cmdline = OS.getFFmpegCommand(args);
             LOG.debug("Command line: {}", Arrays.toString(cmdline));
             Process ffmpeg = Runtime.getRuntime().exec(cmdline, new String[0], videoFile.getParentFile());
-            int exitCode = 1;
+            int exitCode;
             ByteArrayOutputStream stdErrBuffer = new ByteArrayOutputStream();
             Thread stdout = new Thread(new StreamRedirector(ffmpeg.getInputStream(), new DevNull()));
             Thread stderr = new Thread(new StreamRedirector(ffmpeg.getErrorStream(), stdErrBuffer));
@@ -47,7 +49,7 @@ public class VideoLengthDetector {
             LOG.debug("FFmpeg exited with code {}", exitCode);
             stdout.join();
             stderr.join();
-            String ffmpegStderr = new String(stdErrBuffer.toByteArray());
+            String ffmpegStderr = stdErrBuffer.toString();
             return parseDuration(ffmpegStderr);
         } catch (IOException | ProcessExitedUncleanException e) {
             LOG.error("Error in FFMpeg thread", e);