diff --git a/src/main/java/net/knarcraft/ffmpegconverter/converter/AbstractConverter.java b/src/main/java/net/knarcraft/ffmpegconverter/converter/AbstractConverter.java
index cbb5b4f..30fe0be 100644
--- a/src/main/java/net/knarcraft/ffmpegconverter/converter/AbstractConverter.java
+++ b/src/main/java/net/knarcraft/ffmpegconverter/converter/AbstractConverter.java
@@ -19,11 +19,11 @@ import java.util.List;
  */
 public abstract class AbstractConverter implements Converter {
     final boolean DEBUG = false;
+    private final String newExtension;
     String ffprobePath;
     String ffmpegPath;
     String[] audioFormats;
     String[] videoFormats;
-    private final String newExtension;
 
     /**
      * Initializes variables used by the abstract converter
@@ -42,18 +42,18 @@ public abstract class AbstractConverter implements Converter {
     /**
      * Filters parsed streams into one of the stream types
      *
-     * @param streams   <p>A list of stream objects.</p>
-     * @param codecType <p>The codec type of the streams to select.</p>
-     * @param <G>       <p>The correct object type for the streams with the selected codec type.</p>
+     * @param streams <p>A list of stream objects.</p>
+     * @param clazz   <p>The class to filter</p>
+     * @param <G>     <p>The correct object type for the streams with the selected codec type.</p>
      * @return <p>A potentially shorter list of streams.</p>
      */
     @SuppressWarnings("unchecked")
-    static <G extends StreamObject> List<G> filterStreamsByType(List<StreamObject> streams, String codecType) {
+    static <G extends StreamObject> List<G> filterStreamsByType(List<StreamObject> streams, Class<?> clazz) {
         Iterator<StreamObject> i = streams.iterator();
         List<G> newStreams = new ArrayList<>();
         while (i.hasNext()) {
             StreamObject next = i.next();
-            if (next.getCodecType().equals(codecType)) {
+            if (next.getClass() == clazz) {
                 newStreams.add((G) next);
             }
         }
@@ -143,6 +143,7 @@ public abstract class AbstractConverter implements Converter {
             if (toStereo && audioStream.getChannels() > 2) {
                 command.add("-af");
                 command.add("pan=stereo|FL=FC+0.30*FL+0.30*BL|FR=FC+0.30*FR+0.30*BR");
+                //command.add("pan=stereo|FL < 1.0*FL + 0.707*FC + 0.707*BL|FR < 1.0*FR + 0.707*FC + 0.707*BR");
             }
         }
     }
@@ -155,7 +156,7 @@ public abstract class AbstractConverter implements Converter {
      * @param videoStream    <p>The video stream to be used.</p>
      * @param file           <p>The file to convert.</p>
      */
-    void addSubtitles(List<String> command, SubtitleStream subtitleStream, VideoStream videoStream, File file) {
+    void addSubtitlesAndVideo(List<String> command, SubtitleStream subtitleStream, VideoStream videoStream, File file) {
         //No appropriate subtitle was found. Just add the video stream.
         if (subtitleStream == null) {
             command.add("-map");
@@ -242,4 +243,52 @@ public abstract class AbstractConverter implements Converter {
         ProcessBuilder processBuilder = new ProcessBuilder(builderCommand(ffmpegPath, file, streams, newPath));
         FFMpegHelper.convertProcess(processBuilder, folder);
     }
+
+    /**
+     * Gets the first audio stream from a list of streams
+     *
+     * @param streams <p>A list of all streams.</p>
+     * @return <p>The first audio stream found or null if no audio streams were found.</p>
+     */
+    AudioStream getFirstAudioSteam(List<StreamObject> streams) {
+        List<AudioStream> audioStreams = filterStreamsByType(streams, AudioStream.class);
+        AudioStream audioStream = null;
+        if (audioStreams.size() > 0) {
+            audioStream = audioStreams.get(0);
+        }
+        return audioStream;
+    }
+
+    /**
+     * Gets the first subtitle stream from a list of streams
+     *
+     * @param streams <p>A list of all streams.</p>
+     * @return <p>The first subtitle stream found or null if no subtitle streams were found.</p>
+     */
+    SubtitleStream getFirstSubtitleStream(List<StreamObject> streams) {
+        List<SubtitleStream> subtitleStreams = filterStreamsByType(streams, SubtitleStream.class);
+        SubtitleStream subtitleStream = null;
+        if (subtitleStreams.size() > 0) {
+            subtitleStream = subtitleStreams.get(0);
+        }
+        return subtitleStream;
+    }
+
+    /**
+     * Gets the first video stream from a list of streams
+     *
+     * @param streams <p>A list of all streams.</p>
+     * @return <p>The first video stream found or null if no video streams were found.</p>
+     */
+    VideoStream getFirstVideoStream(List<StreamObject> streams) {
+        List<VideoStream> videoStreams = filterStreamsByType(streams, VideoStream.class);
+        VideoStream videoStream = null;
+        if (videoStreams.size() > 0) {
+            videoStream = videoStreams.get(0);
+        }
+        if (videoStream == null) {
+            throw new IllegalArgumentException("The file does not have any valid video streams.");
+        }
+        return videoStream;
+    }
 }
diff --git a/src/main/java/net/knarcraft/ffmpegconverter/converter/AnimeConverter.java b/src/main/java/net/knarcraft/ffmpegconverter/converter/AnimeConverter.java
index 98776cc..f12f83f 100644
--- a/src/main/java/net/knarcraft/ffmpegconverter/converter/AnimeConverter.java
+++ b/src/main/java/net/knarcraft/ffmpegconverter/converter/AnimeConverter.java
@@ -5,19 +5,18 @@ import net.knarcraft.ffmpegconverter.streams.StreamObject;
 import net.knarcraft.ffmpegconverter.streams.SubtitleStream;
 import net.knarcraft.ffmpegconverter.streams.VideoStream;
 import net.knarcraft.ffmpegconverter.utility.FFMpegHelper;
-import net.knarcraft.ffmpegconverter.utility.FileUtil;
-import net.knarcraft.ffmpegconverter.utility.OutputUtil;
 
 import java.io.File;
 import java.io.IOException;
+import java.util.ArrayList;
 import java.util.List;
 
 /**
  * A converter mainly designed for converting anime to web-playable mp4
  */
 public class AnimeConverter extends AbstractConverter {
-    private final String[] audioLang;
-    private final String[] subtitleLang;
+    private final String[] audioLanguages;
+    private final String[] subtitleLanguages;
     private final boolean toStereo;
     private final boolean preventSignsAndSongs;
 
@@ -26,18 +25,18 @@ public class AnimeConverter extends AbstractConverter {
      *
      * @param ffprobePath          <p>Path/command to ffprobe.</p>
      * @param ffmpegPath           <p>Path/command to ffmpeg.</p>
-     * @param audioLang            <p>List of wanted audio languages in descending order.</p>
-     * @param subtitleLang         <p>List of wanted subtitle languages in descending order.</p>
+     * @param audioLanguages       <p>List of wanted audio languages in descending order.</p>
+     * @param subtitleLanguages    <p>List of wanted subtitle languages in descending order.</p>
      * @param toStereo             <p>Convert video with several audio channels to stereo.</p>
      * @param preventSignsAndSongs <p>Prevent subtitles only converting signs and songs (not speech).</p>
      */
-    public AnimeConverter(String ffprobePath, String ffmpegPath, String[] audioLang, String[] subtitleLang,
+    public AnimeConverter(String ffprobePath, String ffmpegPath, String[] audioLanguages, String[] subtitleLanguages,
                           boolean toStereo, boolean preventSignsAndSongs) {
         super("mp4");
         this.ffprobePath = ffprobePath;
         this.ffmpegPath = ffmpegPath;
-        this.audioLang = audioLang;
-        this.subtitleLang = subtitleLang;
+        this.audioLanguages = audioLanguages;
+        this.subtitleLanguages = subtitleLanguages;
         this.toStereo = toStereo;
         this.preventSignsAndSongs = preventSignsAndSongs;
     }
@@ -50,34 +49,25 @@ public class AnimeConverter extends AbstractConverter {
     @Override
     public String[] builderCommand(String executable, File file, List<StreamObject> streams, String outFile) {
         List<String> command = FFMpegHelper.getFFMpegWebVideoCommand(executable, file.getName());
-
         if (this.DEBUG) {
             FFMpegHelper.addDebugArguments(command, 50, 120);
         }
 
-        List<AudioStream> audioStreams = filterAudioStreams(filterStreamsByType(streams, "audio"), audioLang);
-        List<VideoStream> videoStreams = filterStreamsByType(streams, "video");
+        //Get the first audio stream in accordance with chosen languages
+        List<AudioStream> audioStreams = filterAudioStreams(filterStreamsByType(streams, AudioStream.class), audioLanguages);
+        AudioStream audioStream = getFirstAudioSteam(new ArrayList<>(audioStreams));
+
+        //Get the first subtitle stream in accordance with chosen languages and signs and songs prevention
         List<SubtitleStream> subtitleStreams = filterSubtitleStreams(filterStreamsByType(streams,
-                "subtitle"), subtitleLang, preventSignsAndSongs);
+                SubtitleStream.class), subtitleLanguages, preventSignsAndSongs);
+        SubtitleStream subtitleStream = getFirstSubtitleStream(new ArrayList<>(subtitleStreams));
 
-        VideoStream videoStream = null;
-        AudioStream audioStream = null;
-        SubtitleStream subtitleStream = null;
-        if (videoStreams.size() > 0) {
-            videoStream = videoStreams.get(0);
-        }
-        if (videoStream == null) {
-            throw new IllegalArgumentException("The file does not have any valid video streams.");
-        }
-        if (audioStreams.size() > 0) {
-            audioStream = audioStreams.get(0);
-        }
-        if (subtitleStreams.size() > 0) {
-            subtitleStream = subtitleStreams.get(0);
-        }
+        //Get the first video stream
+        VideoStream videoStream = getFirstVideoStream(streams);
 
+        //Add streams to output file
         addAudioStreams(command, audioStream, toStereo);
-        addSubtitles(command, subtitleStream, videoStream, file);
+        addSubtitlesAndVideo(command, subtitleStream, videoStream, file);
 
         command.add(outFile);
         return command.toArray(new String[0]);
diff --git a/src/main/java/net/knarcraft/ffmpegconverter/converter/AudioConverter.java b/src/main/java/net/knarcraft/ffmpegconverter/converter/AudioConverter.java
index bb22648..04968a4 100644
--- a/src/main/java/net/knarcraft/ffmpegconverter/converter/AudioConverter.java
+++ b/src/main/java/net/knarcraft/ffmpegconverter/converter/AudioConverter.java
@@ -16,9 +16,9 @@ public class AudioConverter extends AbstractConverter {
     /**
      * Instantiates a new audio converter
      *
-     * @param ffprobePath <p>Path/command to ffprobe.</p>
-     * @param ffmpegPath  <p>Path/command to ffmpeg.</p>
-     * @param newExtension      <p>The extension of the new file.</p>
+     * @param ffprobePath  <p>Path/command to ffprobe.</p>
+     * @param ffmpegPath   <p>Path/command to ffmpeg.</p>
+     * @param newExtension <p>The extension of the new file.</p>
      */
     public AudioConverter(String ffprobePath, String ffmpegPath, String newExtension) {
         super(newExtension);
@@ -29,16 +29,14 @@ public class AudioConverter extends AbstractConverter {
     @Override
     public String[] builderCommand(String executable, File file, List<StreamObject> streams, String outFile) {
         List<String> command = FFMpegHelper.getFFMpegGeneralFileCommand(executable, file.getName());
-        List<AudioStream> audioStreams = filterStreamsByType(streams, "audio");
-        AudioStream audioStream = null;
-        if (audioStreams.size() > 0) {
-            audioStream = audioStreams.get(0);
+        if (this.DEBUG) {
+            FFMpegHelper.addDebugArguments(command, 50, 120);
         }
-        if (audioStreams.size() > 0) {
-            command.add("-map");
-            command.add("0:" + audioStream.getAbsoluteIndex());
-        }
-        command.add(outFile);
+
+        //Gets the first audio stream from the file and adds it to the output file
+        AudioStream audioStream = getFirstAudioSteam(streams);
+        addAudioStreams(command, audioStream, false);
+
         return command.toArray(new String[0]);
     }
 
diff --git a/src/main/java/net/knarcraft/ffmpegconverter/converter/VideoConverter.java b/src/main/java/net/knarcraft/ffmpegconverter/converter/VideoConverter.java
index d5ca136..18dc20f 100644
--- a/src/main/java/net/knarcraft/ffmpegconverter/converter/VideoConverter.java
+++ b/src/main/java/net/knarcraft/ffmpegconverter/converter/VideoConverter.java
@@ -18,9 +18,9 @@ public class VideoConverter extends AbstractConverter {
     /**
      * Instantiates a new video converter
      *
-     * @param ffprobePath <p>Path/command to ffprobe.</p>
-     * @param ffmpegPath  <p>Path/command to ffmpeg.</p>
-     * @param newExtension      <p>The extension of the new file.</p>
+     * @param ffprobePath  <p>Path/command to ffprobe.</p>
+     * @param ffmpegPath   <p>Path/command to ffmpeg.</p>
+     * @param newExtension <p>The extension of the new file.</p>
      */
     public VideoConverter(String ffprobePath, String ffmpegPath, String newExtension) {
         super(newExtension);
@@ -31,51 +31,25 @@ public class VideoConverter extends AbstractConverter {
     @Override
     public String[] builderCommand(String executable, File file, List<StreamObject> streams, String outFile) {
         List<String> command = FFMpegHelper.getFFMpegGeneralFileCommand(executable, file.getName());
-
         if (this.DEBUG) {
             FFMpegHelper.addDebugArguments(command, 50, 120);
         }
 
-        List<AudioStream> audioStreams = filterStreamsByType(streams, "audio");
-        List<VideoStream> videoStreams = filterStreamsByType(streams, "video");
-        List<SubtitleStream> subtitleStreams = filterStreamsByType(streams, "subtitle");
+        //Get first streams from the file
+        SubtitleStream subtitleStream = getFirstSubtitleStream(streams);
+        VideoStream videoStream = getFirstVideoStream(streams);
+        AudioStream audioStream = getFirstAudioSteam(streams);
 
-        VideoStream videoStream = null;
-        AudioStream audioStream = null;
-        SubtitleStream subtitleStream = null;
-        if (videoStreams.size() > 0) {
-            videoStream = videoStreams.get(0);
+        //Add streams to output
+        addSubtitlesAndVideo(command, subtitleStream, videoStream, file);
+        if (audioStream != null) {
+            addAudioStreams(command, audioStream, true);
         }
-        if (audioStreams.size() > 0) {
-            audioStream = audioStreams.get(0);
-        }
-        if (subtitleStreams.size() > 0) {
-            subtitleStream = subtitleStreams.get(0);
-        }
-
-        addSubtitles(command, subtitleStream, videoStream, file);
-
-        if (audioStreams.size() > 0) {
-            command.add("-map");
-            command.add("0:" + audioStream);
-        }
-
-        convertToStereo(command);
 
         command.add(outFile);
         return command.toArray(new String[0]);
     }
 
-    /**
-     * Converts the audio of a video to stereo
-     *
-     * @param command <p>The command list to add to.</p>
-     */
-    private void convertToStereo(List<String> command) {
-        command.add("-af");
-        command.add("pan=stereo|FL < 1.0*FL + 0.707*FC + 0.707*BL|FR < 1.0*FR + 0.707*FC + 0.707*BR");
-    }
-
     @Override
     public String[] getValidFormats() {
         return videoFormats;
diff --git a/src/main/java/net/knarcraft/ffmpegconverter/utility/FileUtil.java b/src/main/java/net/knarcraft/ffmpegconverter/utility/FileUtil.java
index 156273d..2d7dd6a 100644
--- a/src/main/java/net/knarcraft/ffmpegconverter/utility/FileUtil.java
+++ b/src/main/java/net/knarcraft/ffmpegconverter/utility/FileUtil.java
@@ -17,8 +17,8 @@ public final class FileUtil {
     /**
      * Gets the path described by the input, but changed to account for collisions
      *
-     * @param folder <p>The folder containing the output file.</p>
-     * @param file <p>The input file.</p>
+     * @param folder       <p>The folder containing the output file.</p>
+     * @param file         <p>The input file.</p>
      * @param outExtension <p>The extension of the output file.</p>
      * @return <p>A file name with the new extension and without any collisions.</p>
      */