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[webvtt, extractor/youtube] Extract auto-subs from livestream VODs

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Closes #4130

Authored by: pukkandan, fstirlitz
This commit is contained in:
pukkandan 2022-06-22 03:46:54 +05:30
parent 07b47084ba
commit c646d76f67
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GPG Key ID: 7EEE9E1E817D0A39
2 changed files with 36 additions and 16 deletions
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25
yt_dlp/extractor/youtube.py
View File

@ -2298,7 +2298,7 @@ def refetch_manifest(format_id, delay):
microformats = traverse_obj(
prs, (..., 'microformat', 'playerMicroformatRenderer'),
expected_type=dict, default=[])
_, is_live, _, formats = self._list_formats(video_id, microformats, video_details, prs, player_url)
_, is_live, _, formats, _ = self._list_formats(video_id, microformats, video_details, prs, player_url)
start_time = time.time()
def mpd_feed(format_id, delay):
@ -3136,7 +3136,7 @@ def append_client(*client_names):
self.report_warning(last_error)
return prs, player_url
def _extract_formats(self, streaming_data, video_id, player_url, is_live, duration):
def _extract_formats_and_subtitles(self, streaming_data, video_id, player_url, is_live, duration):
itags, stream_ids = {}, []
itag_qualities, res_qualities = {}, {}
q = qualities([
@ -3293,17 +3293,22 @@ def process_manifest_format(f, proto, itag):
if val in qdict), -1)
return True
subtitles = {}
for sd in streaming_data:
hls_manifest_url = get_hls and sd.get('hlsManifestUrl')
if hls_manifest_url:
for f in self._extract_m3u8_formats(hls_manifest_url, video_id, 'mp4', fatal=False):
fmts, subs = self._extract_m3u8_formats_and_subtitles(hls_manifest_url, video_id, 'mp4', fatal=False, live=is_live)
subtitles = self._merge_subtitles(subs, subtitles)
for f in fmts:
if process_manifest_format(f, 'hls', self._search_regex(
r'/itag/(\d+)', f['url'], 'itag', default=None)):
yield f
dash_manifest_url = get_dash and sd.get('dashManifestUrl')
if dash_manifest_url:
for f in self._extract_mpd_formats(dash_manifest_url, video_id, fatal=False):
formats, subs = self._extract_mpd_formats_and_subtitles(dash_manifest_url, video_id, fatal=False)
subtitles = self._merge_subtitles(subs, subtitles) # Prioritize HLS subs over DASH
for f in formats:
if process_manifest_format(f, 'dash', f['format_id']):
f['filesize'] = int_or_none(self._search_regex(
r'/clen/(\d+)', f.get('fragment_base_url') or f['url'], 'file size', default=None))
@ -3311,6 +3316,7 @@ def process_manifest_format(f, proto, itag):
f['is_from_start'] = True
yield f
yield subtitles
def _extract_storyboard(self, player_responses, duration):
spec = get_first(
@ -3371,9 +3377,9 @@ def _list_formats(self, video_id, microformats, video_details, player_responses,
is_live = get_first(live_broadcast_details, 'isLiveNow')
streaming_data = traverse_obj(player_responses, (..., 'streamingData'), default=[])
formats = list(self._extract_formats(streaming_data, video_id, player_url, is_live, duration))
*formats, subtitles = self._extract_formats_and_subtitles(streaming_data, video_id, player_url, is_live, duration)
return live_broadcast_details, is_live, streaming_data, formats
return live_broadcast_details, is_live, streaming_data, formats, subtitles
def _real_extract(self, url):
url, smuggled_data = unsmuggle_url(url, {})
@ -3464,8 +3470,8 @@ def feed_entry(name):
'The livestream has not finished processing. Only 4 hours of the video can be currently downloaded. '
'This is a known issue and patches are welcome')
live_broadcast_details, is_live, streaming_data, formats = self._list_formats(
video_id, microformats, video_details, player_responses, player_url, duration)
live_broadcast_details, is_live, streaming_data, formats, automatic_captions = \
self._list_formats(video_id, microformats, video_details, player_responses, player_url)
if not formats:
if not self.get_param('allow_unplayable_formats') and traverse_obj(streaming_data, (..., 'licenseInfos')):
@ -3595,6 +3601,7 @@ def feed_entry(name):
'release_timestamp': live_start_time,
}
subtitles = {}
pctr = traverse_obj(player_responses, (..., 'captions', 'playerCaptionsTracklistRenderer'), expected_type=dict)
if pctr:
def get_lang_code(track):
@ -3624,7 +3631,6 @@ def process_language(container, base_url, lang_code, sub_name, query):
# NB: Constructing the full subtitle dictionary is slow
get_translated_subs = 'translated_subs' not in self._configuration_arg('skip') and (
self.get_param('writeautomaticsub', False) or self.get_param('listsubtitles'))
subtitles, automatic_captions = {}, {}
for lang_code, caption_track in captions.items():
base_url = caption_track.get('baseUrl')
orig_lang = parse_qs(base_url).get('lang', [None])[-1]
@ -3655,6 +3661,7 @@ def process_language(container, base_url, lang_code, sub_name, query):
# Setting tlang=lang returns damaged subtitles.
process_language(automatic_captions, base_url, trans_code, trans_name,
{} if orig_lang == orig_trans_code else {'tlang': trans_code})
info['automatic_captions'] = automatic_captions
info['subtitles'] = subtitles

19
yt_dlp/webvtt.py
View File

@ -161,6 +161,12 @@ class Magic(HeaderBlock):
_REGEX_TSMAP_MPEGTS = re.compile(r'MPEGTS:([0-9]+)')
_REGEX_TSMAP_SEP = re.compile(r'[ \t]*,[ \t]*')
# This was removed from the spec in the 2017 revision;
# the last spec draft to describe this syntax element is
# <https://www.w3.org/TR/2015/WD-webvtt1-20151208/#webvtt-metadata-header>.
# Nevertheless, YouTube keeps serving those
_REGEX_META = re.compile(r'(?:(?!-->)[^\r\n])+:(?:(?!-->)[^\r\n])+(?:\r\n|[\r\n])')
@classmethod
def __parse_tsmap(cls, parser):
parser = parser.child()
@ -200,13 +206,18 @@ def parse(cls, parser):
raise ParseError(parser)
extra = m.group(1)
local, mpegts = None, None
local, mpegts, meta = None, None, ''
while not parser.consume(_REGEX_NL):
if parser.consume(cls._REGEX_TSMAP):
local, mpegts = cls.__parse_tsmap(parser)
if not parser.consume(_REGEX_NL):
continue
m = parser.consume(cls._REGEX_META)
if m:
meta += m.group(0)
continue
raise ParseError(parser)
parser.commit()
return cls(extra=extra, mpegts=mpegts, local=local)
return cls(extra=extra, mpegts=mpegts, local=local, meta=meta)
def write_into(self, stream):
stream.write('WEBVTT')
@ -219,6 +230,8 @@ def write_into(self, stream):
stream.write(',MPEGTS:')
stream.write(str(self.mpegts if self.mpegts is not None else 0))
stream.write('\n')
if self.meta:
stream.write(self.meta)
stream.write('\n')