Added new option '--list-subs' to show the available subtitle languages

test/parameters.json

@@ -39,5 +39,6 @@
     "writeinfojson": true, 
     "writesubtitles": false,
     "onlysubtitles": false,
-    "allsubtitles": false
+    "allsubtitles": false,
+    "listssubtitles": false
 }

test/test_youtube_subtitles.py

@@ -43,6 +43,7 @@ class TestYoutubeSubtitles(unittest.TestCase):
         DL.params['allsubtitles'] = False
         DL.params['writesubtitles'] = False
         DL.params['subtitlesformat'] = 'srt'
+        DL.params['listsubtitles'] = False
     def test_youtube_no_subtitles(self):
         DL = FakeDownloader()
         DL.params['writesubtitles'] = False
@@ -88,6 +89,12 @@ class TestYoutubeSubtitles(unittest.TestCase):
         info_dict = IE.extract('QRS8MkLhQmM')
         sub = info_dict[0]['subtitles'][0]
         self.assertEqual(md5(sub[2]), '13aeaa0c245a8bed9a451cb643e3ad8b')
+    def test_youtube_list_subtitles(self):
+        DL = FakeDownloader()
+        DL.params['listsubtitles'] = True
+        IE = YoutubeIE(DL)
+        info_dict = IE.extract('QRS8MkLhQmM')
+        self.assertEqual(info_dict, None)
 
 if __name__ == '__main__':
     unittest.main()

youtube_dl/FileDownloader.py

@@ -81,6 +81,7 @@ class FileDownloader(object):
     writesubtitles:    Write the video subtitles to a file
     onlysubtitles:     Downloads only the subtitles of the video
     allsubtitles:      Downloads all the subtitles of the video
+    listsubtitles:     Lists all available subtitles for the video
     subtitlesformat:   Subtitle format [sbv/srt] (default=srt)
     subtitleslang:     Language of the subtitles to download
     test:              Download only first bytes to test the downloader.

youtube_dl/InfoExtractors.py

@@ -214,11 +214,16 @@ class YoutubeIE(InfoExtractor):
 
     def report_video_subtitles_download(self, video_id):
         """Report attempt to download video info webpage."""
-        self._downloader.to_screen(u'[youtube] %s: Downloading video subtitles' % video_id)
+        self._downloader.to_screen(u'[youtube] %s: Checking available subtitles' % video_id)
 
-    def report_video_subtitles_request(self, video_id, lang):
+    def report_video_subtitles_request(self, video_id, sub_lang, format):
         """Report attempt to download video info webpage."""
-        self._downloader.to_screen(u'[youtube] %s: Downloading video subtitles for lang: %s' % (video_id,lang))
+        self._downloader.to_screen(u'[youtube] %s: Downloading video subtitles for %s.%s' % (video_id, sub_lang, format))
+
+    def report_video_subtitles_available(self, video_id, sub_lang_list):
+        """Report available subtitles."""
+        sub_lang = ",".join(list(sub_lang_list.keys()))
+        self._downloader.to_screen(u'[youtube] %s: Available subtitles for video: %s' % (video_id, sub_lang))
 
     def report_information_extraction(self, video_id):
         """Report attempt to extract video information."""
@@ -233,6 +238,7 @@ class YoutubeIE(InfoExtractor):
         self._downloader.to_screen(u'[youtube] RTMP download detected')
 
     def _get_available_subtitles(self, video_id):
+        self.report_video_subtitles_download(video_id)
         request = compat_urllib_request.Request('http://video.google.com/timedtext?hl=en&type=list&v=%s' % video_id)
         try:
             sub_list = compat_urllib_request.urlopen(request).read().decode('utf-8')
@@ -241,11 +247,15 @@ class YoutubeIE(InfoExtractor):
         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'WARNING: video has no closed captions', None)
+            return (u'WARNING: video doesn\'t have download', None)
         return sub_lang_list
 
+    def _list_available_subtitles(self, video_id):
+        sub_lang_list = self._get_available_subtitles(video_id)
+        self.report_video_subtitles_available(video_id, sub_lang_list)
+
     def _request_subtitle(self, sub_lang, sub_name, video_id, format):
-        self.report_video_subtitles_request(video_id, sub_lang)
+        self.report_video_subtitles_request(video_id, sub_lang, format)
         params = compat_urllib_parse.urlencode({
             'lang': sub_lang,
             'name': sub_name,
@@ -262,7 +272,6 @@ class YoutubeIE(InfoExtractor):
         return (None, sub_lang, sub)
 
     def _extract_subtitle(self, video_id):
-        self.report_video_subtitles_download(video_id)
         sub_lang_list = self._get_available_subtitles(video_id)
         sub_format = self._downloader.params.get('subtitlesformat')
         if self._downloader.params.get('subtitleslang', False):
@@ -278,7 +287,6 @@ class YoutubeIE(InfoExtractor):
         return [subtitle]
 
     def _extract_all_subtitles(self, video_id):
-        self.report_video_subtitles_download(video_id)
         sub_lang_list = self._get_available_subtitles(video_id)
         sub_format = self._downloader.params.get('subtitlesformat')
         subtitles = []
@@ -523,6 +531,10 @@ class YoutubeIE(InfoExtractor):
                 if sub_error:
                     self._downloader.trouble(sub_error)
 
+        if self._downloader.params.get('listsubtitles', False):
+            sub_lang_list = self._list_available_subtitles(video_id)
+            return
+
         if 'length_seconds' not in video_info:
             self._downloader.trouble(u'WARNING: unable to extract video duration')
             video_duration = ''

youtube_dl/__init__.py

@@ -182,6 +182,9 @@ def parseOpts():
     video_format.add_option('--all-subs',
             action='store_true', dest='allsubtitles',
             help='downloads all the available subtitles of the video (currently youtube only)', default=False)
+    video_format.add_option('--list-subs',
+            action='store_true', dest='listsubtitles',
+            help='lists all available subtitles for the video (currently youtube only)', default=False)
     video_format.add_option('--sub-format',
             action='store', dest='subtitlesformat', metavar='LANG',
             help='subtitle format [srt/sbv] (default=srt) (currently youtube only)', default='srt')
@@ -461,6 +464,7 @@ def _real_main():
         'writesubtitles': opts.writesubtitles,
         'onlysubtitles': opts.onlysubtitles,
         'allsubtitles': opts.allsubtitles,
+        'listsubtitles': opts.listsubtitles,
         'subtitlesformat': opts.subtitlesformat,
         'subtitleslang': opts.subtitleslang,
         'matchtitle': decodeOption(opts.matchtitle),