1 from __future__ import unicode_literals
3 from .fragment import FragmentFD
4 from ..compat import compat_urllib_error
7 class DashSegmentsFD(FragmentFD):
9 Download segments in a DASH manifest
12 FD_NAME = 'dashsegments'
14 def real_download(self, filename, info_dict):
15 segments = info_dict['fragments'][:1] if self.params.get(
16 'test', False) else info_dict['fragments']
20 'total_frags': len(segments),
23 self._prepare_and_start_frag_download(ctx)
25 fragment_retries = self.params.get('fragment_retries', 0)
26 skip_unavailable_fragments = self.params.get('skip_unavailable_fragments', True)
29 for i, segment in enumerate(segments):
31 if frag_index <= ctx['fragment_index']:
33 # In DASH, the first segment contains necessary headers to
34 # generate a valid MP4 file, so always abort for the first segment
35 fatal = i == 0 or not skip_unavailable_fragments
37 while count <= fragment_retries:
39 success, frag_content = self._download_fragment(ctx, segment['url'], info_dict)
42 self._append_fragment(ctx, frag_content)
44 except compat_urllib_error.HTTPError as err:
45 # YouTube may often return 404 HTTP error for a fragment causing the
46 # whole download to fail. However if the same fragment is immediately
47 # retried with the same request data this usually succeeds (1-2 attemps
48 # is usually enough) thus allowing to download the whole file successfully.
49 # To be future-proof we will retry all fragments that fail with any
52 if count <= fragment_retries:
53 self.report_retry_fragment(err, frag_index, count, fragment_retries)
54 if count > fragment_retries:
56 self.report_skip_fragment(frag_index)
58 self.report_error('giving up after %s fragment retries' % fragment_retries)
61 self._finish_frag_download(ctx)