Subtitles rework
diff --git a/test/test_youtube_subtitles.py b/test/test_youtube_subtitles.py
index 86e09c9b1b3..fe0eac68047 100644
--- a/test/test_youtube_subtitles.py
+++ b/test/test_youtube_subtitles.py
@@ -35,47 +35,47 @@ def test_youtube_subtitles(self):
         DL.params['writesubtitles'] = True
         IE = YoutubeIE(DL)
         info_dict = IE.extract('QRS8MkLhQmM')
-        sub = info_dict[0]['subtitles'][0]
-        self.assertEqual(md5(sub[2]), '4cd9278a35ba2305f47354ee13472260')
+        sub = info_dict[0]['subtitles']['en']
+        self.assertEqual(md5(sub), '4cd9278a35ba2305f47354ee13472260')
     def test_youtube_subtitles_it(self):
         DL = FakeYDL()
         DL.params['writesubtitles'] = True
         DL.params['subtitleslang'] = 'it'
         IE = YoutubeIE(DL)
         info_dict = IE.extract('QRS8MkLhQmM')
-        sub = info_dict[0]['subtitles'][0]
-        self.assertEqual(md5(sub[2]), '164a51f16f260476a05b50fe4c2f161d')
+        sub = info_dict[0]['subtitles']['it']
+        self.assertEqual(md5(sub), '164a51f16f260476a05b50fe4c2f161d')
     def test_youtube_onlysubtitles(self):
         DL = FakeYDL()
         DL.params['writesubtitles'] = True
         DL.params['onlysubtitles'] = True
         IE = YoutubeIE(DL)
         info_dict = IE.extract('QRS8MkLhQmM')
-        sub = info_dict[0]['subtitles'][0]
-        self.assertEqual(md5(sub[2]), '4cd9278a35ba2305f47354ee13472260')
+        sub = info_dict[0]['subtitles']['en']
+        self.assertEqual(md5(sub), '4cd9278a35ba2305f47354ee13472260')
     def test_youtube_allsubtitles(self):
         DL = FakeYDL()
         DL.params['allsubtitles'] = True
         IE = YoutubeIE(DL)
         info_dict = IE.extract('QRS8MkLhQmM')
         subtitles = info_dict[0]['subtitles']
-        self.assertEqual(len(subtitles), 13)
+        self.assertEqual(len(subtitles.keys()), 13)
     def test_youtube_subtitles_sbv_format(self):
         DL = FakeYDL()
         DL.params['writesubtitles'] = True
         DL.params['subtitlesformat'] = 'sbv'
         IE = YoutubeIE(DL)
         info_dict = IE.extract('QRS8MkLhQmM')
-        sub = info_dict[0]['subtitles'][0]
-        self.assertEqual(md5(sub[2]), '13aeaa0c245a8bed9a451cb643e3ad8b')
+        sub = info_dict[0]['subtitles']['en']
+        self.assertEqual(md5(sub), '13aeaa0c245a8bed9a451cb643e3ad8b')
     def test_youtube_subtitles_vtt_format(self):
         DL = FakeYDL()
         DL.params['writesubtitles'] = True
         DL.params['subtitlesformat'] = 'vtt'
         IE = YoutubeIE(DL)
         info_dict = IE.extract('QRS8MkLhQmM')
-        sub = info_dict[0]['subtitles'][0]
-        self.assertEqual(md5(sub[2]), '356cdc577fde0c6783b9b822e7206ff7')
+        sub = info_dict[0]['subtitles']['en']
+        self.assertEqual(md5(sub), '356cdc577fde0c6783b9b822e7206ff7')
     def test_youtube_list_subtitles(self):
         DL = FakeYDL()
         DL.params['listsubtitles'] = True
@@ -88,8 +88,8 @@ def test_youtube_automatic_captions(self):
         DL.params['subtitleslang'] = 'it'
         IE = YoutubeIE(DL)
         info_dict = IE.extract('8YoUxe5ncPo')
-        sub = info_dict[0]['subtitles'][0]
-        self.assertTrue(sub[2] is not None)
+        sub = info_dict[0]['subtitles']['it']
+        self.assertTrue(sub is not None)
 
 if __name__ == '__main__':
     unittest.main()
diff --git a/youtube_dl/YoutubeDL.py b/youtube_dl/YoutubeDL.py
index c76f1118ee5..e69d844b8a6 100644
--- a/youtube_dl/YoutubeDL.py
+++ b/youtube_dl/YoutubeDL.py
@@ -483,41 +483,28 @@ def process_info(self, info_dict):
                 self.report_error(u'Cannot write description file ' + descfn)
                 return
 
-        if (self.params.get('writesubtitles', False) or self.params.get('writeautomaticsub')) and 'subtitles' in info_dict and info_dict['subtitles']:
+        subtitles_are_requested = any([self.params.get('writesubtitles', False),
+                                       self.params.get('writeautomaticsub'),
+                                       self.params.get('allsubtitles', False)])
+
+        if  subtitles_are_requested and 'subtitles' in info_dict and info_dict['subtitles']:
             # subtitles download errors are already managed as troubles in relevant IE
             # that way it will silently go on when used with unsupporting IE
-            subtitle = info_dict['subtitles'][0]
-            (sub_error, sub_lang, sub) = subtitle
+            subtitles = info_dict['subtitles']
             sub_format = self.params.get('subtitlesformat')
-            if sub_error:
-                self.report_warning("Some error while getting the subtitles")
-            else:
+            for sub_lang in subtitles.keys():
+                sub = subtitles[sub_lang]
+                if sub is None:
+                    continue
                 try:
                     sub_filename = filename.rsplit('.', 1)[0] + u'.' + sub_lang + u'.' + sub_format
                     self.report_writesubtitles(sub_filename)
                     with io.open(encodeFilename(sub_filename), 'w', encoding='utf-8') as subfile:
-                        subfile.write(sub)
+                            subfile.write(sub)
                 except (OSError, IOError):
                     self.report_error(u'Cannot write subtitles file ' + descfn)
                     return
 
-        if self.params.get('allsubtitles', False) and 'subtitles' in info_dict and info_dict['subtitles']:
-            subtitles = info_dict['subtitles']
-            sub_format = self.params.get('subtitlesformat')
-            for subtitle in subtitles:
-                (sub_error, sub_lang, sub) = subtitle
-                if sub_error:
-                    self.report_warning("Some error while getting the subtitles")
-                else:
-                    try:
-                        sub_filename = filename.rsplit('.', 1)[0] + u'.' + sub_lang + u'.' + sub_format
-                        self.report_writesubtitles(sub_filename)
-                        with io.open(encodeFilename(sub_filename), 'w', encoding='utf-8') as subfile:
-                                subfile.write(sub)
-                    except (OSError, IOError):
-                        self.report_error(u'Cannot write subtitles file ' + descfn)
-                        return
-
         if self.params.get('writeinfojson', False):
             infofn = filename + u'.info.json'
             self.report_writeinfojson(infofn)
diff --git a/youtube_dl/extractor/common.py b/youtube_dl/extractor/common.py
index da50abfc1cd..e2e192beff5 100644
--- a/youtube_dl/extractor/common.py
+++ b/youtube_dl/extractor/common.py
@@ -47,7 +47,8 @@ class InfoExtractor(object):
     uploader_id:    Nickname or id of the video uploader.
     location:       Physical location of the video.
     player_url:     SWF Player URL (used for rtmpdump).
-    subtitles:      The subtitle file contents.
+    subtitles:      The subtitle file contents as a dictionary in the format
+                    {language: subtitles}.
     view_count:     How many users have watched the video on the platform.
     urlhandle:      [internal] The urlHandle to be used to download the file,
                     like returned by urllib.request.urlopen
diff --git a/youtube_dl/extractor/youtube.py b/youtube_dl/extractor/youtube.py
index 12e8fc25d6f..2b03226f60e 100644
--- a/youtube_dl/extractor/youtube.py
+++ b/youtube_dl/extractor/youtube.py
@@ -209,11 +209,13 @@ def _get_available_subtitles(self, video_id):
         try:
             sub_list = compat_urllib_request.urlopen(request).read().decode('utf-8')
         except (compat_urllib_error.URLError, compat_http_client.HTTPException, socket.error) as err:
-            return (u'unable to download video subtitles: %s' % compat_str(err), None)
+            self._downloader.report_warning(u'unable to download video subtitles: %s' % compat_str(err))
+            return {}
         sub_lang_list = re.findall(r'name="([^"]*)"[^>]+lang_code="([\w\-]+)"', sub_list)
         sub_lang_list = dict((l[1], l[0]) for l in sub_lang_list)
         if not sub_lang_list:
-            return (u'video doesn\'t have subtitles', None)
+            self._downloader.report_warning(u'video doesn\'t have subtitles')
+            return {}
         return sub_lang_list
 
     def _list_available_subtitles(self, video_id):
@@ -222,8 +224,7 @@ def _list_available_subtitles(self, video_id):
 
     def _request_subtitle(self, sub_lang, sub_name, video_id, format):
         """
-        Return tuple:
-        (error_message, sub_lang, sub)
+        Return the subtitle as a string or None if they are not found
         """
         self.report_video_subtitles_request(video_id, sub_lang, format)
         params = compat_urllib_parse.urlencode({
@@ -236,10 +237,12 @@ def _request_subtitle(self, sub_lang, sub_name, video_id, format):
         try:
             sub = compat_urllib_request.urlopen(url).read().decode('utf-8')
         except (compat_urllib_error.URLError, compat_http_client.HTTPException, socket.error) as err:
-            return (u'unable to download video subtitles: %s' % compat_str(err), None, None)
+            self._downloader.report_warning(u'unable to download video subtitles for %s: %s' % (sub_lang, compat_str(err)))
+            return
         if not sub:
-            return (u'Did not fetch video subtitles', None, None)
-        return (None, sub_lang, sub)
+            self._downloader.report_warning(u'Did not fetch video subtitles')
+            return
+        return sub
 
     def _request_automatic_caption(self, video_id, webpage):
         """We need the webpage for getting the captions url, pass it as an
@@ -250,7 +253,8 @@ def _request_automatic_caption(self, video_id, webpage):
         mobj = re.search(r';ytplayer.config = ({.*?});', webpage)
         err_msg = u'Couldn\'t find automatic captions for "%s"' % sub_lang
         if mobj is None:
-            return [(err_msg, None, None)]
+            self._downloader.report_warning(err_msg)
+            return {}
         player_config = json.loads(mobj.group(1))
         try:
             args = player_config[u'args']
@@ -265,40 +269,38 @@ def _request_automatic_caption(self, video_id, webpage):
             })
             subtitles_url = caption_url + '&' + params
             sub = self._download_webpage(subtitles_url, video_id, u'Downloading automatic captions')
-            return [(None, sub_lang, sub)]
-        except KeyError:
-            return [(err_msg, None, None)]
-
-    def _extract_subtitle(self, video_id):
+            return {sub_lang: sub}
+        # An extractor error can be raise by the download process if there are
+        # no automatic captions but there are subtitles
+        except (KeyError, ExtractorError):
+            self._downloader.report_warning(err_msg)
+            return {}
+    
+    def _extract_subtitles(self, video_id):
         """
-        Return a list with a tuple:
-        [(error_message, sub_lang, sub)]
+        Return a dictionary: {language: subtitles} or {} if the subtitles
+        couldn't be found
         """
         sub_lang_list = self._get_available_subtitles(video_id)
         sub_format = self._downloader.params.get('subtitlesformat')
-        if  isinstance(sub_lang_list,tuple): #There was some error, it didn't get the available subtitles
-            return [(sub_lang_list[0], None, None)]
-        if self._downloader.params.get('subtitleslang', False):
-            sub_lang = self._downloader.params.get('subtitleslang')
-        elif 'en' in sub_lang_list:
-            sub_lang = 'en'
-        else:
-            sub_lang = list(sub_lang_list.keys())[0]
-        if not sub_lang in sub_lang_list:
-            return [(u'no closed captions found in the specified language "%s"' % sub_lang, None, None)]
-
-        subtitle = self._request_subtitle(sub_lang, sub_lang_list[sub_lang].encode('utf-8'), video_id, sub_format)
-        return [subtitle]
-
-    def _extract_all_subtitles(self, video_id):
-        sub_lang_list = self._get_available_subtitles(video_id)
-        sub_format = self._downloader.params.get('subtitlesformat')
-        if  isinstance(sub_lang_list,tuple): #There was some error, it didn't get the available subtitles
-            return [(sub_lang_list[0], None, None)]
-        subtitles = []
+        if  not sub_lang_list: #There was some error, it didn't get the available subtitles
+            return {}
+        if self._downloader.params.get('writesubtitles', False):
+            if self._downloader.params.get('subtitleslang', False):
+                sub_lang = self._downloader.params.get('subtitleslang')
+            elif 'en' in sub_lang_list:
+                sub_lang = 'en'
+            else:
+                sub_lang = list(sub_lang_list.keys())[0]
+            if not sub_lang in sub_lang_list:
+                self._downloader.report_warning(u'no closed captions found in the specified language "%s"' % sub_lang)
+                return {}
+            sub_lang_list = {sub_lang: sub_lang_list[sub_lang]}
+        subtitles = {}
         for sub_lang in sub_lang_list:
             subtitle = self._request_subtitle(sub_lang, sub_lang_list[sub_lang].encode('utf-8'), video_id, sub_format)
-            subtitles.append(subtitle)
+            if subtitle:
+                subtitles[sub_lang] = subtitle
         return subtitles
 
     def _print_formats(self, formats):
@@ -521,25 +523,10 @@ def _real_extract(self, url):
         # subtitles
         video_subtitles = None
 
-        if self._downloader.params.get('writesubtitles', False):
-            video_subtitles = self._extract_subtitle(video_id)
-            if video_subtitles:
-                (sub_error, sub_lang, sub) = video_subtitles[0]
-                if sub_error:
-                    self._downloader.report_warning(sub_error)
-        
-        if self._downloader.params.get('writeautomaticsub', False):
+        if self._downloader.params.get('writesubtitles', False) or self._downloader.params.get('allsubtitles', False):
+            video_subtitles = self._extract_subtitles(video_id)
+        elif self._downloader.params.get('writeautomaticsub', False):
             video_subtitles = self._request_automatic_caption(video_id, video_webpage)
-            (sub_error, sub_lang, sub) = video_subtitles[0]
-            if sub_error:
-                self._downloader.report_warning(sub_error)
-
-        if self._downloader.params.get('allsubtitles', False):
-            video_subtitles = self._extract_all_subtitles(video_id)
-            for video_subtitle in video_subtitles:
-                (sub_error, sub_lang, sub) = video_subtitle
-                if sub_error:
-                    self._downloader.report_warning(sub_error)
 
         if self._downloader.params.get('listsubtitles', False):
             self._list_available_subtitles(video_id)

Now the subtitles field in the info dict is just a dictionary with the keys being the language and the values, the subtitles. If the subtitles are not found/are not available for that language it should be set to `{}`.
The error handling logic has been simplified, now each function reports a warning and return None or `{}` if it can't do his work.
The code needed for saving the subtitles have been reduced to a single loop that iterates over the subtitles dictionary.

I think these changes simplify adding subtitles extraction to other IEs (I'm planning to do it for TED).

Note: the test fail quite often, because it gets a lot of 404 errors from youtube.
