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[youtube] Add alternative automatic captions extraction approach (Closes #8667)

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This commit is contained in:
Sergey M․ 2016-02-26 22:21:47 +06:00
parent efbd6fb8bb
commit b78b292f0c
1 changed files with 55 additions and 28 deletions
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35
youtube_dl/extractor/youtube.py
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@ -975,10 +975,8 @@ class YoutubeIE(YoutubeBaseInfoExtractor):
return {} return {}
try: try:
args = player_config['args'] args = player_config['args']
caption_url = args['ttsurl'] caption_url = args.get('ttsurl')
if not caption_url: if caption_url:
self._downloader.report_warning(err_msg)
return {}
timestamp = args['timestamp'] timestamp = args['timestamp']
# We get the available subtitles # We get the available subtitles
list_params = compat_urllib_parse.urlencode({ list_params = compat_urllib_parse.urlencode({
@ -1013,6 +1011,35 @@ class YoutubeIE(YoutubeBaseInfoExtractor):
}) })
sub_lang_list[sub_lang] = sub_formats sub_lang_list[sub_lang] = sub_formats
return sub_lang_list return sub_lang_list
# Some videos don't provide ttsurl but rather caption_tracks and
# caption_translation_languages (e.g. 20LmZk1hakA)
caption_tracks = args['caption_tracks']
caption_translation_languages = args['caption_translation_languages']
caption_url = compat_parse_qs(caption_tracks.split(',')[0])['u'][0]
parsed_caption_url = compat_urlparse.urlparse(caption_url)
caption_qs = compat_parse_qs(parsed_caption_url.query)
sub_lang_list = {}
for lang in caption_translation_languages.split(','):
lang_qs = compat_parse_qs(compat_urllib_parse_unquote_plus(lang))
sub_lang = lang_qs.get('lc', [None])[0]
if not sub_lang:
continue
sub_formats = []
for ext in self._SUBTITLE_FORMATS:
caption_qs.update({
'tlang': [sub_lang],
'fmt': [ext],
})
sub_url = compat_urlparse.urlunparse(parsed_caption_url._replace(
query=compat_urllib_parse.urlencode(caption_qs, True)))
sub_formats.append({
'url': sub_url,
'ext': ext,
})
sub_lang_list[sub_lang] = sub_formats
return sub_lang_list
# An extractor error can be raise by the download process if there are # An extractor error can be raise by the download process if there are
# no automatic captions but there are subtitles # no automatic captions but there are subtitles
except (KeyError, ExtractorError): except (KeyError, ExtractorError):