]> git.bitcoin.ninja Git - youtube-dl/blob - downloader/dash.py
[youtube] Fix extraction.
[youtube-dl] / downloader / dash.py
1 from __future__ import unicode_literals
2
3 from .fragment import FragmentFD
4 from ..compat import compat_urllib_error
5 from ..utils import (
6     DownloadError,
7     urljoin,
8 )
9
10
11 class DashSegmentsFD(FragmentFD):
12     """
13     Download segments in a DASH manifest
14     """
15
16     FD_NAME = 'dashsegments'
17
18     def real_download(self, filename, info_dict):
19         fragment_base_url = info_dict.get('fragment_base_url')
20         fragments = info_dict['fragments'][:1] if self.params.get(
21             'test', False) else info_dict['fragments']
22
23         ctx = {
24             'filename': filename,
25             'total_frags': len(fragments),
26         }
27
28         self._prepare_and_start_frag_download(ctx)
29
30         fragment_retries = self.params.get('fragment_retries', 0)
31         skip_unavailable_fragments = self.params.get('skip_unavailable_fragments', True)
32
33         frag_index = 0
34         for i, fragment in enumerate(fragments):
35             frag_index += 1
36             if frag_index <= ctx['fragment_index']:
37                 continue
38             # In DASH, the first segment contains necessary headers to
39             # generate a valid MP4 file, so always abort for the first segment
40             fatal = i == 0 or not skip_unavailable_fragments
41             count = 0
42             while count <= fragment_retries:
43                 try:
44                     fragment_url = fragment.get('url')
45                     if not fragment_url:
46                         assert fragment_base_url
47                         fragment_url = urljoin(fragment_base_url, fragment['path'])
48                     success, frag_content = self._download_fragment(ctx, fragment_url, info_dict)
49                     if not success:
50                         return False
51                     self._append_fragment(ctx, frag_content)
52                     break
53                 except compat_urllib_error.HTTPError as err:
54                     # YouTube may often return 404 HTTP error for a fragment causing the
55                     # whole download to fail. However if the same fragment is immediately
56                     # retried with the same request data this usually succeeds (1-2 attemps
57                     # is usually enough) thus allowing to download the whole file successfully.
58                     # To be future-proof we will retry all fragments that fail with any
59                     # HTTP error.
60                     count += 1
61                     if count <= fragment_retries:
62                         self.report_retry_fragment(err, frag_index, count, fragment_retries)
63                 except DownloadError:
64                     # Don't retry fragment if error occurred during HTTP downloading
65                     # itself since it has own retry settings
66                     if not fatal:
67                         self.report_skip_fragment(frag_index)
68                         break
69                     raise
70
71             if count > fragment_retries:
72                 if not fatal:
73                     self.report_skip_fragment(frag_index)
74                     continue
75                 self.report_error('giving up after %s fragment retries' % fragment_retries)
76                 return False
77
78         self._finish_frag_download(ctx)
79
80         return True