+    def _convert_subtitles_to_ass(self, sub_root):
+        output = ''
+
+        def ass_bool(strvalue):
+            assvalue = '0'
+            if strvalue == '1':
+                assvalue = '-1'
+            return assvalue
+
+        output = '[Script Info]\n'
+        output += 'Title: %s\n' % sub_root.attrib['title']
+        output += 'ScriptType: v4.00+\n'
+        output += 'WrapStyle: %s\n' % sub_root.attrib['wrap_style']
+        output += 'PlayResX: %s\n' % sub_root.attrib['play_res_x']
+        output += 'PlayResY: %s\n' % sub_root.attrib['play_res_y']
+        output += """
+[V4+ Styles]
+Format: Name, Fontname, Fontsize, PrimaryColour, SecondaryColour, OutlineColour, BackColour, Bold, Italic, Underline, StrikeOut, ScaleX, ScaleY, Spacing, Angle, BorderStyle, Outline, Shadow, Alignment, MarginL, MarginR, MarginV, Encoding
+"""
+        for style in sub_root.findall('./styles/style'):
+            output += 'Style: ' + style.attrib['name']
+            output += ',' + style.attrib['font_name']
+            output += ',' + style.attrib['font_size']
+            output += ',' + style.attrib['primary_colour']
+            output += ',' + style.attrib['secondary_colour']
+            output += ',' + style.attrib['outline_colour']
+            output += ',' + style.attrib['back_colour']
+            output += ',' + ass_bool(style.attrib['bold'])
+            output += ',' + ass_bool(style.attrib['italic'])
+            output += ',' + ass_bool(style.attrib['underline'])
+            output += ',' + ass_bool(style.attrib['strikeout'])
+            output += ',' + style.attrib['scale_x']
+            output += ',' + style.attrib['scale_y']
+            output += ',' + style.attrib['spacing']
+            output += ',' + style.attrib['angle']
+            output += ',' + style.attrib['border_style']
+            output += ',' + style.attrib['outline']
+            output += ',' + style.attrib['shadow']
+            output += ',' + style.attrib['alignment']
+            output += ',' + style.attrib['margin_l']
+            output += ',' + style.attrib['margin_r']
+            output += ',' + style.attrib['margin_v']
+            output += ',' + style.attrib['encoding']
+            output += '\n'
+
+        output += """
+[Events]
+Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text
+"""
+        for event in sub_root.findall('./events/event'):
+            output += 'Dialogue: 0'
+            output += ',' + event.attrib['start']
+            output += ',' + event.attrib['end']
+            output += ',' + event.attrib['style']
+            output += ',' + event.attrib['name']
+            output += ',' + event.attrib['margin_l']
+            output += ',' + event.attrib['margin_r']
+            output += ',' + event.attrib['margin_v']
+            output += ',' + event.attrib['effect']
+            output += ',' + event.attrib['text']
+            output += '\n'
+
+        return output
+
+    def _extract_subtitles(self, subtitle):
+        sub_root = compat_etree_fromstring(subtitle)
+        return [{
+            'ext': 'srt',
+            'data': self._convert_subtitles_to_srt(sub_root),
+        }, {
+            'ext': 'ass',
+            'data': self._convert_subtitles_to_ass(sub_root),
+        }]
+
+    def _get_subtitles(self, video_id, webpage):
+        subtitles = {}
+        for sub_id, sub_name in re.findall(r'\bssid=([0-9]+)"[^>]+?\btitle="([^"]+)', webpage):
+            sub_doc = self._call_rpc_api(
+                'Subtitle_GetXml', video_id,
+                'Downloading subtitles for ' + sub_name, data={
+                    'subtitle_script_id': sub_id,
+                })
+            if not isinstance(sub_doc, etree.Element):
+                continue
+            sid = sub_doc.get('id')
+            iv = xpath_text(sub_doc, 'iv', 'subtitle iv')
+            data = xpath_text(sub_doc, 'data', 'subtitle data')
+            if not sid or not iv or not data:
+                continue
+            subtitle = self._decrypt_subtitles(data, iv, sid).decode('utf-8')
+            lang_code = self._search_regex(r'lang_code=["\']([^"\']+)', subtitle, 'subtitle_lang_code', fatal=False)
+            if not lang_code:
+                continue
+            subtitles[lang_code] = self._extract_subtitles(subtitle)
+        return subtitles
+
+    def _real_extract(self, url):