import re
from .fragment import FragmentFD
+from ..compat import compat_urllib_error
from ..utils import (
sanitize_open,
encodeFilename,
return '%s%s%s' % (base_url, '' if base_url.endswith('/') else '/', target_url)
segments_filenames = []
- def append_url_to_file(target_url, target_filename):
- success = ctx['dl'].download(target_filename, {'url': combine_url(base_url, target_url)})
- if not success:
+
+ fragment_retries = self.params.get('fragment_retries', 0)
+ skip_unavailable_fragments = self.params.get('skip_unavailable_fragments', True)
+
+ def process_segment(segment, tmp_filename, fatal):
+ target_url, segment_name = segment
+ target_filename = '%s-%s' % (tmp_filename, segment_name)
+ count = 0
+ while count <= fragment_retries:
+ try:
+ success = ctx['dl'].download(target_filename, {'url': combine_url(base_url, target_url)})
+ if not success:
+ return False
+ down, target_sanitized = sanitize_open(target_filename, 'rb')
+ ctx['dest_stream'].write(down.read())
+ down.close()
+ segments_filenames.append(target_sanitized)
+ break
+ except compat_urllib_error.HTTPError as err:
+ # YouTube may often return 404 HTTP error for a fragment causing the
+ # whole download to fail. However if the same fragment is immediately
+ # retried with the same request data this usually succeeds (1-2 attemps
+ # is usually enough) thus allowing to download the whole file successfully.
+ # To be future-proof we will retry all fragments that fail with any
+ # HTTP error.
+ count += 1
+ if count <= fragment_retries:
+ self.report_retry_fragment(err, segment_name, count, fragment_retries)
+ if count > fragment_retries:
+ if not fatal:
+ self.report_skip_fragment(segment_name)
+ return True
+ self.report_error('giving up after %s fragment retries' % fragment_retries)
+ return False
+ return True
+
+ segments_to_download = [(initialization_url, 'Init')] if initialization_url else []
+ segments_to_download.extend([
+ (segment_url, 'Seg%d' % i)
+ for i, segment_url in enumerate(segment_urls)])
+
+ for i, segment in enumerate(segments_to_download):
+ # In DASH, the first segment contains necessary headers to
+ # generate a valid MP4 file, so always abort for the first segment
+ fatal = i == 0 or not skip_unavailable_fragments
+ if not process_segment(segment, ctx['tmpfilename'], fatal):
return False
- down, target_sanitized = sanitize_open(target_filename, 'rb')
- ctx['dest_stream'].write(down.read())
- down.close()
- segments_filenames.append(target_sanitized)
-
- if initialization_url:
- append_url_to_file(initialization_url, ctx['tmpfilename'] + '-Init')
- for i, segment_url in enumerate(segment_urls):
- segment_filename = '%s-Seg%d' % (ctx['tmpfilename'], i)
- append_url_to_file(segment_url, segment_filename)
self._finish_frag_download(ctx)