diff --git a/src/TizenVideo/TizenVideo.js b/src/TizenVideo/TizenVideo.js
index 239bd12..518a0f7 100644
--- a/src/TizenVideo/TizenVideo.js
+++ b/src/TizenVideo/TizenVideo.js
@@ -156,7 +156,9 @@ function TizenVideo(options) {
         if (!gotTraktData && stream !== null) {
             gotTraktData = true;
             getTracksData(stream.url, function(resp) {
-                tracksData = resp;
+                if (resp) {
+                    tracksData = resp;
+                }
                 if (((tracksData || {}).subs || []).length) {
                     onPropChanged('subtitlesTracks');
                 }
@@ -234,10 +236,10 @@ function TizenVideo(options) {
                         var textTrackLang = typeof extra.track_lang === 'string' && extra.track_lang.length > 0 ? extra.track_lang.trim() : null;
                         if (((tracksData || {}).subs || []).length) {
                             var extendedTrackData = tracksData.subs.find(function(el) {
-                                return (el || {}).id === textTrack.index;
+                                return (el || {}).id-1 === textTrack.index;
                             });
-                            if ((extendedTrackData || {}).lang) {
-                                textTrackLang = extendedTrackData.lang;
+                            if (extendedTrackData) {
+                                textTrackLang = extendedTrackData.lang || 'eng';
                             }
                         }
                         textTracks.push({
@@ -336,10 +338,10 @@ function TizenVideo(options) {
                         var audioTrackLang = typeof extra.language === 'string' && extra.language.length > 0 ? extra.language : null;
                         if (((tracksData || {}).audio || []).length) {
                             var extendedTrackData = tracksData.audio.find(function(el) {
-                                return (el || {}).id === audioTrack.index;
+                                return (el || {}).id-1 === audioTrack.index;
                             });
-                            if ((extendedTrackData || {}).lang) {
-                                audioTrackLang = extendedTrackData.lang;
+                            if (extendedTrackData) {
+                                audioTrackLang = extendedTrackData.lang || 'eng';
                             }
                         }
                         audioTracks.push({
diff --git a/src/WebOsVideo/WebOsVideo.js b/src/WebOsVideo/WebOsVideo.js
index 4b9e2df..d9eaada 100644
--- a/src/WebOsVideo/WebOsVideo.js
+++ b/src/WebOsVideo/WebOsVideo.js
@@ -229,6 +229,7 @@ function WebOsVideo(options) {
         }
     };
 
+    // eslint-disable-next-line no-unused-vars
     var subscribe = function (cb) {
         if (subscribed) return;
         subscribed = true;
@@ -440,6 +441,7 @@ function WebOsVideo(options) {
     };
 
     var gotTraktData = false;
+    var tracksData = { audio: [], subs: [] };
 
     function retrieveExtendedTracks() {
         if (!gotTraktData && stream !== null) {
@@ -449,7 +451,9 @@ function WebOsVideo(options) {
                 var nrAudio = 0;
                 textTracks = [];
                 audioTracks = [];
-                tracksData = resp;
+                if (resp) {
+                    tracksData = resp;
+                }
                 if (((tracksData || {}).subs || []).length) {
                     tracksData.subs.forEach(function(track) {
                         var textTrackId = nrSubs;
@@ -459,8 +463,8 @@ function WebOsVideo(options) {
                         }
                         textTracks.push({
                             id: textTrackId,
-                            lang: track.lang || null,
-                            label: track.lang || null,
+                            lang: track.lang || 'eng',
+                            label: track.lang || 'eng',
                             origin: 'EMBEDDED',
                             embedded: true,
                             mode: textTrackId === currentSubTrack ? 'showing' : 'disabled',
@@ -478,8 +482,8 @@ function WebOsVideo(options) {
                         }
                         audioTracks.push({
                             id: audioTrackId,
-                            lang: track.lang || null,
-                            label: track.lang || null,
+                            lang: track.lang || 'eng',
+                            label: track.lang || 'eng',
                             origin: 'EMBEDDED',
                             embedded: true,
                             mode: audioTrackId === currentAudioTrack ? 'showing' : 'disabled',
@@ -1026,16 +1030,16 @@ function WebOsVideo(options) {
                             if (videoElement.mediaId) {
                                 knownMediaId = videoElement.mediaId;
                                 clearInterval(timer);
-                                retrieveExtendedTracks()
-                                cb()
-//                                subscribe(cb);
+                                retrieveExtendedTracks();
+                                cb();
+                                // subscribe(cb);
                                 return;
                             }
                             count++;
                             if (count > 4) {
                                 // console.log('failed to get media id');
                                 clearInterval(timer);
-                                retrieveExtendedTracks()
+                                retrieveExtendedTracks();
                                 cb();
                             }
                         }
diff --git a/src/tracksData.js b/src/tracksData.js
index 88388bc..b7360c3 100644
--- a/src/tracksData.js
+++ b/src/tracksData.js
@@ -1,17 +1,13 @@
 module.exports = function(url, cb) {
     fetch('http://127.0.0.1:11470/tracks/'+encodeURIComponent(url)).then(function(resp) {
-        resp.json().then(function(tracks) {
-            var audioTracks = tracks.filter(function(el) { return el.type === 'audio'; });
-            var subsTracks = tracks.filter(function(el) { return el.type === 'text'; });
-            cb({ audio: audioTracks, subs: subsTracks });
-        }).catch(function(err) {
-            // eslint-disable-next-line no-console
-            console.error(err);
-            cb({ audio: [], subs: [] });
-        });
+        return resp.json();
+    }).then(function(tracks) {
+        var audioTracks = tracks.filter(function(el) { return el.type === 'audio'; });
+        var subsTracks = tracks.filter(function(el) { return el.type === 'text'; });
+        cb({ audio: audioTracks, subs: subsTracks });
     }).catch(function(err) {
         // eslint-disable-next-line no-console
         console.error(err);
-        cb({ audio: [], subs: [] });
+        cb(false);
     });
 };