- def combine_url(base_url, target_url):
- if re.match(r'^https?://', target_url):
- return target_url
- 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)
+
+ frag_index = 0
+ for i, segment in enumerate(segments):
+ frag_index += 1
+ if frag_index <= ctx['fragment_index']:
+ continue
+ # 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
+ count = 0
+ while count <= fragment_retries:
+ try:
+ success, frag_content = self._download_fragment(ctx, segment['url'], info_dict)
+ if not success:
+ return False
+ self._append_fragment(ctx, frag_content)
+ 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, frag_index, count, fragment_retries)
+ if count > fragment_retries:
+ if not fatal:
+ self.report_skip_fragment(frag_index)
+ continue
+ self.report_error('giving up after %s fragment retries' % fragment_retries)