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[youtubedl] / 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 attempts
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