diff --git a/methods/actions.js b/methods/actions.js
index 8fd132a..c069fe9 100644
--- a/methods/actions.js
+++ b/methods/actions.js
@@ -1,7 +1,7 @@
 var fs = require('fs');
 var path = require("path");
-if (fs.existsSync(path.join(process.cwd() + "/npm"))) {
-    var rootModules = path.join(process.cwd() + '/npm/node_modules/')
+if (fs.existsSync(path.join(process.cwd() , "/npm"))) {
+    var rootModules = path.join(process.cwd() , '/npm/node_modules/')
 } else{
     var rootModules = ''
 }
@@ -10,4 +10,4 @@ const importFresh = require(rootModules+'import-fresh');
 
 module.exports.remuxContainer = importFresh('./library/actions/remuxContainer.js')
 module.exports.transcodeStandardiseAudioCodecs = importFresh('./library/actions/transcodeStandardiseAudioCodecs.js')
-
+module.exports.transcodeAddAudioStream = importFresh('./library/actions/transcodeAddAudioStream.js')
\ No newline at end of file
diff --git a/methods/filters.js b/methods/filters.js
index 624f2ed..89a2f30 100644
--- a/methods/filters.js
+++ b/methods/filters.js
@@ -1,7 +1,7 @@
 var fs = require('fs');
 var path = require("path");
-if (fs.existsSync(path.join(process.cwd() + "/npm"))) {
-    var rootModules = path.join(process.cwd() + '/npm/node_modules/')
+if (fs.existsSync(path.join(process.cwd() , "/npm"))) {
+    var rootModules = path.join(process.cwd() , '/npm/node_modules/')
 } else{
     var rootModules = ''
 }
diff --git a/methods/library.js b/methods/library.js
index 605021a..d0bc194 100644
--- a/methods/library.js
+++ b/methods/library.js
@@ -1,7 +1,7 @@
 var fs = require('fs');
 var path = require("path");
-if (fs.existsSync(path.join(process.cwd() + "/npm"))) {
-    var rootModules = path.join(process.cwd() + '/npm/node_modules/')
+if (fs.existsSync(path.join(process.cwd() , "/npm"))) {
+    var rootModules = path.join(process.cwd() , '/npm/node_modules/')
 } else{
     var rootModules = ''
 }
diff --git a/methods/library/actions/transcodeAddAudioStream.js b/methods/library/actions/transcodeAddAudioStream.js
new file mode 100644
index 0000000..639abd9
--- /dev/null
+++ b/methods/library/actions/transcodeAddAudioStream.js
@@ -0,0 +1,212 @@
+
+
+module.exports = function transcodeAddAudioStream(file, audioEncoder, langTag, channelCount) {
+
+    // response.preset = library.actions.transcodeAddAudioStream(file, 'aac', 'en', 1).preset
+
+    //Function required responses
+    // preset
+    // processFile
+    // note
+
+    try {
+        
+        var audioCodec = audioEncoder
+        langTag = langTag.toLowerCase()
+
+        if (audioEncoder == 'dca') {
+            audioCodec = 'dts'
+        }
+
+        if (audioEncoder == 'libmp3lame') {
+            audioCodec = 'mp3'
+        }
+
+
+
+        //Step 1: Check if the file already has the required stream codec/langtag/channel count
+
+        var hasStreamAlready = file.ffProbeData.streams.filter(stream => {
+
+            try {
+                if (stream.codec_type == 'audio' && stream.codec_name === audioCodec && stream.tags.language.toLowerCase().includes(langTag.toLowerCase()) && stream.channels == channelCount) {
+                    return true
+                }
+
+            } catch (err) { }
+
+            return false
+        })
+
+        if (hasStreamAlready.length > 0) {
+
+            return {
+                preset: '',
+                processFile: false,
+                note: `File already has ${langTag} stream in ${audioEncoder}, ${channelCount} channels\n`
+            }
+        }
+
+
+        //Step 2: Check if file has streams with specified lang tag
+
+        var streamsWithLangTag = file.ffProbeData.streams.filter(stream => {
+
+            // console.log(stream)
+
+            console.log(stream.tags.language)
+            try {
+                if (stream.codec_type == 'audio' && stream.tags.language.toLowerCase().includes(langTag)) {
+                    return true
+                }
+            } catch (err) { }
+
+            return false
+
+        })
+
+        console.log("streamsWithLangTag:" + streamsWithLangTag)
+
+        if (streamsWithLangTag.length != 0) {
+
+            return attemptMakeStream(langTag)
+
+        } else {
+
+            return attemptMakeStream('und')
+
+        }
+
+
+        function attemptMakeStream(langTag) {
+
+            console.log(langTag)
+
+            var streamsWithLangTag = file.ffProbeData.streams.filter(stream => {
+                try {
+                    console.log(langTag)
+                    console.log(stream.tags.language.toLowerCase())
+                    console.log(stream.tags.language.toLowerCase().includes(langTag))
+                    if (stream.codec_type == 'audio' && stream.tags.language.toLowerCase().includes(langTag)) {
+
+                        return true
+                    }
+
+                } catch (err) { }
+
+                return false
+
+            })
+
+            if (streamsWithLangTag.length == 0) {
+                return {
+                    preset: ``,
+                    processFile: false,
+                    note: `Unable to add audio stream in ${langTag}/und with ${channelCount} channels \n`
+                }
+            }
+
+            var highestChannelCount = streamsWithLangTag.reduce(getHighest)
+
+            function getHighest(first, second) {
+                if (first.channels > second.channels && first) {
+                    return first
+                } else {
+                    return second
+                }
+            }
+
+
+
+            if (parseInt(highestChannelCount.channels) >= parseInt(channelCount)) {
+
+                var hasStreamAlready = file.ffProbeData.streams.filter(stream => {
+
+                    try {
+                        if (stream.codec_type == 'audio' && stream.codec_name === audioCodec && stream.tags.language.toLowerCase().includes(langTag.toLowerCase()) && stream.channels == channelCount) {
+                            return true
+                        }
+
+                    } catch (err) { }
+
+                    return false
+                })
+
+                if (hasStreamAlready.length > 0) {
+
+                    return {
+                        preset: '',
+                        processFile: false,
+                        note: `File already has ${langTag} stream in ${audioEncoder}, ${channelCount} channels \n`
+                    }
+
+
+
+                } else {
+
+
+                    return {
+                        preset: `,-map 0:v -map 0:${highestChannelCount.index} -map 0:a -map 0:s? -map 0:d? -c copy -c:a:0 ${audioEncoder} -ac ${channelCount}`,
+                        processFile: true,
+                        note: `The required channel count ${channelCount} is lower than the highest available channel count (${highestChannelCount.channels}). Adding! \n`
+                    }
+
+
+
+                }
+
+
+
+
+            } else {
+
+                console.log('here3')
+
+                var hasStreamAlready = file.ffProbeData.streams.filter(stream => {
+
+                    try {
+                        if (stream.codec_type == 'audio' && stream.codec_name === audioCodec && stream.tags.language.toLowerCase().includes(langTag.toLowerCase()) && stream.channels == highestChannelCount.channels) {
+                            return true
+                        }
+
+                    } catch (err) { }
+
+                    return false
+                })
+
+                if (hasStreamAlready.length > 0) {
+
+                    return {
+                        preset: '',
+                        processFile: false,
+                        note: `File already has ${langTag} stream in ${audioEncoder}, ${highestChannelCount.channels} channels (Highest available) \n`
+                    }
+                } else {
+
+                    return {
+                        preset: `,-map 0:v -map 0:${highestChannelCount.index} -map 0:a -map 0:s? -map 0:d? -c copy -c:a:0 ${audioEncoder} -ac ${highestChannelCount.channels}`,
+                        processFile: true,
+                        note: `The required channel count (${channelCount}) is higher than the highest channel available in specified lang tag (${highestChannelCount.channels}). Adding lower channel track. \n`
+                    }
+
+                }
+
+            }
+        }
+
+
+
+
+
+
+
+    } catch (err) {
+
+        return {
+            preset: '',
+            processFile: false,
+            note: `library.actions.transcodeAddAudioStream error: ${err} \n`
+        }
+
+    }
+}
diff --git a/methods/library/actions/transcodeStandardiseAudioCodecs.js b/methods/library/actions/transcodeStandardiseAudioCodecs.js
index f3333cc..8259a3d 100644
--- a/methods/library/actions/transcodeStandardiseAudioCodecs.js
+++ b/methods/library/actions/transcodeStandardiseAudioCodecs.js
@@ -3,26 +3,27 @@
 module.exports = function transcodeStandardiseAudioCodecs(file, audioEncoder) {
 
 
-    try {
-
-        var audioIdx = -1
-        var hasNonSpecifiedAudioCodecStream = false
-        var ffmpegCommandInsert = ''
-
-
         //Function required responses
         // preset
         // processFile
         // note
 
+    try {
 
-
+        var audioIdx = -1
+        var hasNonSpecifiedAudioCodecStream = false
+        var ffmpegCommandInsert = ''
         var audioCodec = audioEncoder
 
         if (audioEncoder == 'dca') {
             audioCodec = 'dts'
         }
 
+        if (audioEncoder == 'libmp3lame') {
+            audioCodec = 'mp3'
+        }
+
+
 
 
         for (var i = 0; i < file.ffProbeData.streams.length; i++) {