- 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:
- return False
- down, target_sanitized = sanitize_open(target_filename, 'rb')
- ctx['dest_stream'].write(down.read())
- down.close()
- segments_filenames.append(target_sanitized)
+ frag_index = 0
+ for i, fragment in enumerate(fragments):
+ 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:
+ fragment_url = fragment.get('url')
+ if not fragment_url:
+ assert fragment_base_url
+ fragment_url = urljoin(fragment_base_url, fragment['path'])
+ success, frag_content = self._download_fragment(ctx, fragment_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 attempts
+ # 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)
+ except DownloadError:
+ # Don't retry fragment if error occurred during HTTP downloading
+ # itself since it has own retry settings
+ if not fatal:
+ self.report_skip_fragment(frag_index)
+ break
+ raise