from ..compat import (
compat_cookiejar,
compat_cookies,
+ compat_etree_fromstring,
compat_getpass,
compat_http_client,
+ compat_os_name,
+ compat_str,
compat_urllib_error,
- compat_urllib_parse,
+ compat_urllib_parse_urlencode,
+ compat_urllib_request,
compat_urlparse,
- compat_str,
- compat_etree_fromstring,
)
+from ..downloader.f4m import remove_encrypted_media
from ..utils import (
NO_DEFAULT,
age_restricted,
unescapeHTML,
unified_strdate,
url_basename,
+ xpath_element,
xpath_text,
xpath_with_ns,
determine_protocol,
parse_duration,
mimetype2ext,
+ update_Request,
+ update_url_query,
+ parse_m3u8_attributes,
)
* protocol The protocol that will be used for the actual
download, lower-case.
"http", "https", "rtsp", "rtmp", "rtmpe",
- "m3u8", or "m3u8_native".
+ "m3u8", "m3u8_native" or "http_dash_segments".
* preference Order number of this format. If this field is
present and not None, the formats get sorted
by this field, regardless of all other values.
thumbnail: Full URL to a video thumbnail image.
description: Full video description.
uploader: Full name of the video uploader.
- creator: The main artist who created the video.
+ license: License name the video is licensed under.
+ creator: The creator of the video.
release_date: The date (YYYYMMDD) when the video was released.
timestamp: UNIX timestamp of the moment the video became available.
upload_date: Video upload date (YYYYMMDD).
If not explicitly set, calculated from timestamp.
uploader_id: Nickname or id of the video uploader.
+ uploader_url: Full URL to a personal webpage of the video uploader.
location: Physical location where the video was filmed.
subtitles: The available subtitles as a dictionary in the format
{language: subformats}. "subformats" is a list sorted from
episode_number: Number of the video episode within a season, as an integer.
episode_id: Id of the video episode, as a unicode string.
+ The following fields should only be used when the media is a track or a part of
+ a music album:
+
+ track: Title of the track.
+ track_number: Number of the track within an album or a disc, as an integer.
+ track_id: Id of the track (useful in case of custom indexing, e.g. 6.iii),
+ as a unicode string.
+ artist: Artist(s) of the track.
+ genre: Genre(s) of the track.
+ album: Title of the album the track belongs to.
+ album_type: Type of the album (e.g. "Demo", "Full-length", "Split", "Compilation", etc).
+ album_artist: List of all artists appeared on the album (e.g.
+ "Ash Borer / Fell Voices" or "Various Artists", useful for splits
+ and compilations).
+ disc_number: Number of the disc or other physical medium the track belongs to,
+ as an integer.
+ release_year: Year (YYYY) when the album was released.
+
Unless mentioned otherwise, the fields should be Unicode strings.
Unless mentioned otherwise, None is equivalent to absence of information.
def IE_NAME(self):
return compat_str(type(self).__name__[:-2])
- def _request_webpage(self, url_or_request, video_id, note=None, errnote=None, fatal=True):
+ def _request_webpage(self, url_or_request, video_id, note=None, errnote=None, fatal=True, data=None, headers={}, query={}):
""" Returns the response handle """
if note is None:
self.report_download_webpage(video_id)
self.to_screen('%s' % (note,))
else:
self.to_screen('%s: %s' % (video_id, note))
+ if isinstance(url_or_request, compat_urllib_request.Request):
+ url_or_request = update_Request(
+ url_or_request, data=data, headers=headers, query=query)
+ else:
+ if query:
+ url_or_request = update_url_query(url_or_request, query)
+ if data is not None or headers:
+ url_or_request = sanitized_Request(url_or_request, data, headers)
try:
return self._downloader.urlopen(url_or_request)
except (compat_urllib_error.URLError, compat_http_client.HTTPException, socket.error) as err:
self._downloader.report_warning(errmsg)
return False
- def _download_webpage_handle(self, url_or_request, video_id, note=None, errnote=None, fatal=True, encoding=None):
+ def _download_webpage_handle(self, url_or_request, video_id, note=None, errnote=None, fatal=True, encoding=None, data=None, headers={}, query={}):
""" Returns a tuple (page content as string, URL handle) """
# Strip hashes from the URL (#1038)
if isinstance(url_or_request, (compat_str, str)):
url_or_request = url_or_request.partition('#')[0]
- urlh = self._request_webpage(url_or_request, video_id, note, errnote, fatal)
+ urlh = self._request_webpage(url_or_request, video_id, note, errnote, fatal, data=data, headers=headers, query=query)
if urlh is False:
assert not fatal
return False
self.to_screen('Saving request to ' + filename)
# Working around MAX_PATH limitation on Windows (see
# http://msdn.microsoft.com/en-us/library/windows/desktop/aa365247(v=vs.85).aspx)
- if os.name == 'nt':
+ if compat_os_name == 'nt':
absfilepath = os.path.abspath(filename)
if len(absfilepath) > 259:
filename = '\\\\?\\' + absfilepath
return content
- def _download_webpage(self, url_or_request, video_id, note=None, errnote=None, fatal=True, tries=1, timeout=5, encoding=None):
+ def _download_webpage(self, url_or_request, video_id, note=None, errnote=None, fatal=True, tries=1, timeout=5, encoding=None, data=None, headers={}, query={}):
""" Returns the data of the page as a string """
success = False
try_count = 0
while success is False:
try:
- res = self._download_webpage_handle(url_or_request, video_id, note, errnote, fatal, encoding=encoding)
+ res = self._download_webpage_handle(url_or_request, video_id, note, errnote, fatal, encoding=encoding, data=data, headers=headers, query=query)
success = True
except compat_http_client.IncompleteRead as e:
try_count += 1
def _download_xml(self, url_or_request, video_id,
note='Downloading XML', errnote='Unable to download XML',
- transform_source=None, fatal=True, encoding=None):
+ transform_source=None, fatal=True, encoding=None, data=None, headers={}, query={}):
"""Return the xml as an xml.etree.ElementTree.Element"""
xml_string = self._download_webpage(
- url_or_request, video_id, note, errnote, fatal=fatal, encoding=encoding)
+ url_or_request, video_id, note, errnote, fatal=fatal, encoding=encoding, data=data, headers=headers, query=query)
if xml_string is False:
return xml_string
if transform_source:
note='Downloading JSON metadata',
errnote='Unable to download JSON metadata',
transform_source=None,
- fatal=True, encoding=None):
+ fatal=True, encoding=None, data=None, headers={}, query={}):
json_string = self._download_webpage(
url_or_request, video_id, note, errnote, fatal=fatal,
- encoding=encoding)
+ encoding=encoding, data=data, headers=headers, query=query)
if (not fatal) and json_string is False:
return None
return self._parse_json(
if mobj:
break
- if not self._downloader.params.get('no_color') and os.name != 'nt' and sys.stderr.isatty():
+ if not self._downloader.params.get('no_color') and compat_os_name != 'nt' and sys.stderr.isatty():
_name = '\033[0;34m%s\033[0m' % name
else:
_name = name
for input in re.findall(r'(?i)<input([^>]+)>', html):
if not re.search(r'type=(["\'])(?:hidden|submit)\1', input):
continue
- name = re.search(r'name=(["\'])(?P<value>.+?)\1', input)
+ name = re.search(r'(?:name|id)=(["\'])(?P<value>.+?)\1', input)
if not name:
continue
value = re.search(r'value=(["\'])(?P<value>.*?)\1', input)
proto_preference = 0 if determine_protocol(f) in ['http', 'https'] else -0.1
if f.get('vcodec') == 'none': # audio only
+ preference -= 50
if self._downloader.params.get('prefer_free_formats'):
ORDER = ['aac', 'mp3', 'm4a', 'webm', 'ogg', 'opus']
else:
except ValueError:
audio_ext_preference = -1
else:
+ if f.get('acodec') == 'none': # video only
+ preference -= 40
if self._downloader.params.get('prefer_free_formats'):
ORDER = ['flv', 'mp4', 'webm']
else:
def _extract_f4m_formats(self, manifest_url, video_id, preference=None, f4m_id=None,
transform_source=lambda s: fix_xml_ampersands(s).strip(),
- fatal=True):
+ fatal=True, m3u8_id=None):
manifest = self._download_xml(
manifest_url, video_id, 'Downloading f4m manifest',
'Unable to download f4m manifest',
if manifest is False:
return []
+ return self._parse_f4m_formats(
+ manifest, manifest_url, video_id, preference=preference, f4m_id=f4m_id,
+ transform_source=transform_source, fatal=fatal, m3u8_id=m3u8_id)
+
+ def _parse_f4m_formats(self, manifest, manifest_url, video_id, preference=None, f4m_id=None,
+ transform_source=lambda s: fix_xml_ampersands(s).strip(),
+ fatal=True, m3u8_id=None):
+ # currently youtube-dl cannot decode the playerVerificationChallenge as Akamai uses Adobe Alchemy
+ akamai_pv = manifest.find('{http://ns.adobe.com/f4m/1.0}pv-2.0')
+ if akamai_pv is not None and ';' in akamai_pv.text:
+ playerVerificationChallenge = akamai_pv.text.split(';')[0]
+ if playerVerificationChallenge.strip() != '':
+ return []
+
formats = []
manifest_version = '1.0'
media_nodes = manifest.findall('{http://ns.adobe.com/f4m/1.0}media')
if not media_nodes:
manifest_version = '2.0'
media_nodes = manifest.findall('{http://ns.adobe.com/f4m/2.0}media')
+ # Remove unsupported DRM protected media from final formats
+ # rendition (see https://github.com/rg3/youtube-dl/issues/8573).
+ media_nodes = remove_encrypted_media(media_nodes)
+ if not media_nodes:
+ return formats
base_url = xpath_text(
manifest, ['{http://ns.adobe.com/f4m/1.0}baseURL', '{http://ns.adobe.com/f4m/2.0}baseURL'],
'base URL', default=None)
if base_url:
base_url = base_url.strip()
+
+ bootstrap_info = xpath_element(
+ manifest, ['{http://ns.adobe.com/f4m/1.0}bootstrapInfo', '{http://ns.adobe.com/f4m/2.0}bootstrapInfo'],
+ 'bootstrap info', default=None)
+
for i, media_el in enumerate(media_nodes):
- if manifest_version == '2.0':
- media_url = media_el.attrib.get('href') or media_el.attrib.get('url')
+ tbr = int_or_none(media_el.attrib.get('bitrate'))
+ width = int_or_none(media_el.attrib.get('width'))
+ height = int_or_none(media_el.attrib.get('height'))
+ format_id = '-'.join(filter(None, [f4m_id, compat_str(i if tbr is None else tbr)]))
+ # If <bootstrapInfo> is present, the specified f4m is a
+ # stream-level manifest, and only set-level manifests may refer to
+ # external resources. See section 11.4 and section 4 of F4M spec
+ if bootstrap_info is None:
+ media_url = None
+ # @href is introduced in 2.0, see section 11.6 of F4M spec
+ if manifest_version == '2.0':
+ media_url = media_el.attrib.get('href')
+ if media_url is None:
+ media_url = media_el.attrib.get('url')
if not media_url:
continue
manifest_url = (
# since bitrates in parent manifest (this one) and media_url manifest
# may differ leading to inability to resolve the format by requested
# bitrate in f4m downloader
- if determine_ext(manifest_url) == 'f4m':
- formats.extend(self._extract_f4m_formats(
- manifest_url, video_id, preference, f4m_id, fatal=fatal))
+ ext = determine_ext(manifest_url)
+ if ext == 'f4m':
+ f4m_formats = self._extract_f4m_formats(
+ manifest_url, video_id, preference=preference, f4m_id=f4m_id,
+ transform_source=transform_source, fatal=fatal)
+ # Sometimes stream-level manifest contains single media entry that
+ # does not contain any quality metadata (e.g. http://matchtv.ru/#live-player).
+ # At the same time parent's media entry in set-level manifest may
+ # contain it. We will copy it from parent in such cases.
+ if len(f4m_formats) == 1:
+ f = f4m_formats[0]
+ f.update({
+ 'tbr': f.get('tbr') or tbr,
+ 'width': f.get('width') or width,
+ 'height': f.get('height') or height,
+ 'format_id': f.get('format_id') if not tbr else format_id,
+ })
+ formats.extend(f4m_formats)
+ continue
+ elif ext == 'm3u8':
+ formats.extend(self._extract_m3u8_formats(
+ manifest_url, video_id, 'mp4', preference=preference,
+ m3u8_id=m3u8_id, fatal=fatal))
continue
- tbr = int_or_none(media_el.attrib.get('bitrate'))
formats.append({
- 'format_id': '-'.join(filter(None, [f4m_id, compat_str(i if tbr is None else tbr)])),
+ 'format_id': format_id,
'url': manifest_url,
- 'ext': 'flv',
+ 'ext': 'flv' if bootstrap_info is not None else None,
'tbr': tbr,
- 'width': int_or_none(media_el.attrib.get('width')),
- 'height': int_or_none(media_el.attrib.get('height')),
+ 'width': width,
+ 'height': height,
'preference': preference,
})
- self._sort_formats(formats)
-
return formats
- def _extract_m3u8_formats(self, m3u8_url, video_id, ext=None,
- entry_protocol='m3u8', preference=None,
- m3u8_id=None, note=None, errnote=None,
- fatal=True):
-
- formats = [{
+ def _m3u8_meta_format(self, m3u8_url, ext=None, preference=None, m3u8_id=None):
+ return {
'format_id': '-'.join(filter(None, [m3u8_id, 'meta'])),
'url': m3u8_url,
'ext': ext,
'preference': preference - 1 if preference else -1,
'resolution': 'multiple',
'format_note': 'Quality selection URL',
- }]
+ }
+
+ def _extract_m3u8_formats(self, m3u8_url, video_id, ext=None,
+ entry_protocol='m3u8', preference=None,
+ m3u8_id=None, note=None, errnote=None,
+ fatal=True, live=False):
+
+ formats = [self._m3u8_meta_format(m3u8_url, ext, preference, m3u8_id)]
format_url = lambda u: (
u
return []
m3u8_doc, urlh = res
m3u8_url = urlh.geturl()
- # A Media Playlist Tag MUST NOT appear in a Master Playlist
- # https://tools.ietf.org/html/draft-pantos-http-live-streaming-17#section-4.3.3
- # The EXT-X-TARGETDURATION tag is REQUIRED for every M3U8 Media Playlists
- # https://tools.ietf.org/html/draft-pantos-http-live-streaming-17#section-4.3.3.1
- if '#EXT-X-TARGETDURATION' in m3u8_doc:
+
+ # We should try extracting formats only from master playlists [1], i.e.
+ # playlists that describe available qualities. On the other hand media
+ # playlists [2] should be returned as is since they contain just the media
+ # without qualities renditions.
+ # Fortunately, master playlist can be easily distinguished from media
+ # playlist based on particular tags availability. As of [1, 2] master
+ # playlist tags MUST NOT appear in a media playist and vice versa.
+ # As of [3] #EXT-X-TARGETDURATION tag is REQUIRED for every media playlist
+ # and MUST NOT appear in master playlist thus we can clearly detect media
+ # playlist with this criterion.
+ # 1. https://tools.ietf.org/html/draft-pantos-http-live-streaming-17#section-4.3.4
+ # 2. https://tools.ietf.org/html/draft-pantos-http-live-streaming-17#section-4.3.3
+ # 3. https://tools.ietf.org/html/draft-pantos-http-live-streaming-17#section-4.3.3.1
+ if '#EXT-X-TARGETDURATION' in m3u8_doc: # media playlist, return as is
return [{
'url': m3u8_url,
'format_id': m3u8_id,
}]
last_info = None
last_media = None
- kv_rex = re.compile(
- r'(?P<key>[a-zA-Z_-]+)=(?P<val>"[^"]+"|[^",]+)(?:,|$)')
for line in m3u8_doc.splitlines():
if line.startswith('#EXT-X-STREAM-INF:'):
- last_info = {}
- for m in kv_rex.finditer(line):
- v = m.group('val')
- if v.startswith('"'):
- v = v[1:-1]
- last_info[m.group('key')] = v
+ last_info = parse_m3u8_attributes(line)
elif line.startswith('#EXT-X-MEDIA:'):
- last_media = {}
- for m in kv_rex.finditer(line):
- v = m.group('val')
- if v.startswith('"'):
- v = v[1:-1]
- last_media[m.group('key')] = v
+ last_media = parse_m3u8_attributes(line)
elif line.startswith('#') or not line.strip():
continue
else:
format_id = []
if m3u8_id:
format_id.append(m3u8_id)
- last_media_name = last_media.get('NAME') if last_media and last_media.get('TYPE') != 'SUBTITLES' else None
- format_id.append(last_media_name if last_media_name else '%d' % (tbr if tbr else len(formats)))
+ last_media_name = last_media.get('NAME') if last_media and last_media.get('TYPE') not in ('SUBTITLES', 'CLOSED-CAPTIONS') else None
+ # Despite specification does not mention NAME attribute for
+ # EXT-X-STREAM-INF it still sometimes may be present
+ stream_name = last_info.get('NAME') or last_media_name
+ # Bandwidth of live streams may differ over time thus making
+ # format_id unpredictable. So it's better to keep provided
+ # format_id intact.
+ if not live:
+ format_id.append(stream_name if stream_name else '%d' % (tbr if tbr else len(formats)))
f = {
'format_id': '-'.join(format_id),
'url': format_url(line.strip()),
'protocol': entry_protocol,
'preference': preference,
}
- codecs = last_info.get('CODECS')
- if codecs:
- # TODO: looks like video codec is not always necessarily goes first
- va_codecs = codecs.split(',')
- if va_codecs[0]:
- f['vcodec'] = va_codecs[0]
- if len(va_codecs) > 1 and va_codecs[1]:
- f['acodec'] = va_codecs[1]
resolution = last_info.get('RESOLUTION')
if resolution:
width_str, height_str = resolution.split('x')
f['width'] = int(width_str)
f['height'] = int(height_str)
+ codecs = last_info.get('CODECS')
+ if codecs:
+ vcodec, acodec = [None] * 2
+ va_codecs = codecs.split(',')
+ if len(va_codecs) == 1:
+ # Audio only entries usually come with single codec and
+ # no resolution. For more robustness we also check it to
+ # be mp4 audio.
+ if not resolution and va_codecs[0].startswith('mp4a'):
+ vcodec, acodec = 'none', va_codecs[0]
+ else:
+ vcodec = va_codecs[0]
+ else:
+ vcodec, acodec = va_codecs[:2]
+ f.update({
+ 'acodec': acodec,
+ 'vcodec': vcodec,
+ })
if last_media is not None:
f['m3u8_media'] = last_media
last_media = None
formats.append(f)
last_info = {}
- self._sort_formats(formats)
return formats
@staticmethod
out.append('{%s}%s' % (namespace, c))
return '/'.join(out)
- def _extract_smil_formats(self, smil_url, video_id, fatal=True, f4m_params=None):
- smil = self._download_smil(smil_url, video_id, fatal=fatal)
+ def _extract_smil_formats(self, smil_url, video_id, fatal=True, f4m_params=None, transform_source=None):
+ smil = self._download_smil(smil_url, video_id, fatal=fatal, transform_source=transform_source)
if smil is False:
assert not fatal
return {}
return self._parse_smil(smil, smil_url, video_id, f4m_params=f4m_params)
- def _download_smil(self, smil_url, video_id, fatal=True):
+ def _download_smil(self, smil_url, video_id, fatal=True, transform_source=None):
return self._download_xml(
smil_url, video_id, 'Downloading SMIL file',
- 'Unable to download SMIL file', fatal=fatal)
+ 'Unable to download SMIL file', fatal=fatal, transform_source=transform_source)
def _parse_smil(self, smil, smil_url, video_id, f4m_params=None):
namespace = self._parse_smil_namespace(smil)
m3u8_count = 0
srcs = []
- videos = smil.findall(self._xpath_ns('.//video', namespace))
- for video in videos:
- src = video.get('src')
+ media = smil.findall(self._xpath_ns('.//video', namespace)) + smil.findall(self._xpath_ns('.//audio', namespace))
+ for medium in media:
+ src = medium.get('src')
if not src or src in srcs:
continue
srcs.append(src)
- bitrate = float_or_none(video.get('system-bitrate') or video.get('systemBitrate'), 1000)
- filesize = int_or_none(video.get('size') or video.get('fileSize'))
- width = int_or_none(video.get('width'))
- height = int_or_none(video.get('height'))
- proto = video.get('proto')
- ext = video.get('ext')
+ bitrate = float_or_none(medium.get('system-bitrate') or medium.get('systemBitrate'), 1000)
+ filesize = int_or_none(medium.get('size') or medium.get('fileSize'))
+ width = int_or_none(medium.get('width'))
+ height = int_or_none(medium.get('height'))
+ proto = medium.get('proto')
+ ext = medium.get('ext')
src_ext = determine_ext(src)
- streamer = video.get('streamer') or base
+ streamer = medium.get('streamer') or base
if proto == 'rtmp' or streamer.startswith('rtmp'):
rtmp_count += 1
'plugin': 'flowplayer-3.2.0.1',
}
f4m_url += '&' if '?' in f4m_url else '?'
- f4m_url += compat_urllib_parse.urlencode(f4m_params)
+ f4m_url += compat_urllib_parse_urlencode(f4m_params)
formats.extend(self._extract_f4m_formats(f4m_url, video_id, f4m_id='hds', fatal=False))
continue
})
continue
- self._sort_formats(formats)
-
return formats
def _parse_smil_subtitles(self, smil, namespace=None, subtitles_lang='en'):
if not src or src in urls:
continue
urls.append(src)
- ext = textstream.get('ext') or determine_ext(src) or mimetype2ext(textstream.get('type'))
+ ext = textstream.get('ext') or mimetype2ext(textstream.get('type')) or determine_ext(src)
lang = textstream.get('systemLanguage') or textstream.get('systemLanguageName') or textstream.get('lang') or subtitles_lang
subtitles.setdefault(lang, []).append({
'url': src,
continue
representation_attrib = adaptation_set.attrib.copy()
representation_attrib.update(representation.attrib)
- mime_type = representation_attrib.get('mimeType')
- content_type = mime_type.split('/')[0] if mime_type else representation_attrib.get('contentType')
+ # According to page 41 of ISO/IEC 29001-1:2014, @mimeType is mandatory
+ mime_type = representation_attrib['mimeType']
+ content_type = mime_type.split('/')[0]
if content_type == 'text':
# TODO implement WebVTT downloading
pass
f = {
'format_id': '%s-%s' % (mpd_id, representation_id) if mpd_id else representation_id,
'url': base_url,
+ 'ext': mimetype2ext(mime_type),
'width': int_or_none(representation_attrib.get('width')),
'height': int_or_none(representation_attrib.get('height')),
'tbr': int_or_none(representation_attrib.get('bandwidth'), 1000),
representation_ms_info['total_number'] = int(math.ceil(float(period_duration) / segment_duration))
media_template = representation_ms_info['media_template']
media_template = media_template.replace('$RepresentationID$', representation_id)
- media_template = re.sub(r'\$(Number|Bandwidth)(?:%(0\d+)d)?\$', r'%(\1)\2d', media_template)
+ media_template = re.sub(r'\$(Number|Bandwidth)\$', r'%(\1)d', media_template)
+ media_template = re.sub(r'\$(Number|Bandwidth)%([^$]+)\$', r'%(\1)\2', media_template)
media_template.replace('$$', '$')
- representation_ms_info['segment_urls'] = [media_template % {'Number': segment_number, 'Bandwidth': representation_attrib.get('bandwidth')} for segment_number in range(representation_ms_info['start_number'], representation_ms_info['total_number'] + representation_ms_info['start_number'])]
+ representation_ms_info['segment_urls'] = [
+ media_template % {
+ 'Number': segment_number,
+ 'Bandwidth': representation_attrib.get('bandwidth')}
+ for segment_number in range(
+ representation_ms_info['start_number'],
+ representation_ms_info['total_number'] + representation_ms_info['start_number'])]
if 'segment_urls' in representation_ms_info:
f.update({
'segment_urls': representation_ms_info['segment_urls'],
existing_format.update(f)
else:
self.report_warning('Unknown MIME type %s in DASH manifest' % mime_type)
- self._sort_formats(formats)
return formats
def _live_title(self, name):
def _get_automatic_captions(self, *args, **kwargs):
raise NotImplementedError('This method must be implemented by subclasses')
+ def mark_watched(self, *args, **kwargs):
+ if (self._downloader.params.get('mark_watched', False) and
+ (self._get_login_info()[0] is not None or
+ self._downloader.params.get('cookiefile') is not None)):
+ self._mark_watched(*args, **kwargs)
+
+ def _mark_watched(self, *args, **kwargs):
+ raise NotImplementedError('This method must be implemented by subclasses')
+
class SearchInfoExtractor(InfoExtractor):
"""
Rapsys Git / youtubedl / blobdiff