fix sub image

OpenshotService/openshot_video_generator.py

@@ -242,7 +242,7 @@ def parse_script(file_path):
     
     for idx in range(int((len(lines)+1)/4)):
         script={}
-        script['index'] = lines[idx * 4]
+        script['index'] = idx
         time_raw = lines[idx * 4 + 1]
         script['content'] = lines[idx * 4 + 2]
         start = time_raw.split(' --> ')[0].split(':')