diff --git a/subtitles.py b/subtitles.py
index b9d590b..b0d0bb7 100755
--- a/subtitles.py
+++ b/subtitles.py
@@ -137,6 +137,8 @@ def render_subtitles(item_json, output_json, output_srt, lang):
                                 'ids': [],
                                 'languages': []
                             }
+                        if not sub['value']:
+                            continue
                         if set(subs[sub_id]['languages']) != set(lang):
                             if not subs[sub_id]['languages']:
                                 subs[sub_id]['value'] += sub['value']
@@ -172,6 +174,25 @@ def render_subtitles(item_json, output_json, output_srt, lang):
         if sub['value'].strip():
             subtitles.append(sub)
 
+    merged = []
+    p = None
+    for sub in subtitles:
+        if not p:
+            merged.append(sub)
+            p = sub
+        else:
+            if p['out'] > sub['in']:
+                if p['value'] == sub['value']:
+                    p['out'] = max(p['out'], sub['out'])
+                else:
+                    p['out'] = sub['in']
+                    merged.append(sub)
+                    p = sub
+            else:
+                merged.append(sub)
+                p = sub
+    subtitles = merged
+
     if output_srt:
         with open(output_srt, 'wb') as fd:
             fd.write(ox.srt.encode(subtitles))