+ fragment_retries = self.params.get('fragment_retries', 0)
+ skip_unavailable_fragments = self.params.get('skip_unavailable_fragments', True)
+
+ def process_segment(segment, tmp_filename, num):
+ segment_url = segment['url']
+ segment_name = 'Frag%d' % num
+ target_filename = '%s-%s' % (tmp_filename, segment_name)
+ # In DASH, the first segment contains necessary headers to
+ # generate a valid MP4 file, so always abort for the first segment
+ fatal = num == 0 or not skip_unavailable_fragments
+ count = 0
+ while count <= fragment_retries:
+ try:
+ success = ctx['dl'].download(target_filename, {'url': segment_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
+
+ for i, segment in enumerate(segments):
+ if not process_segment(segment, ctx['tmpfilename'], i):