mirror of
https://github.com/ytdl-org/youtube-dl.git
synced 2024-11-14 13:25:38 +00:00
78 lines
3.1 KiB
Python
78 lines
3.1 KiB
Python
from __future__ import unicode_literals
|
|
|
|
import itertools
|
|
|
|
from .fragment import FragmentFD
|
|
from ..compat import compat_urllib_error
|
|
from ..utils import (
|
|
DownloadError,
|
|
urljoin,
|
|
)
|
|
|
|
|
|
class DashSegmentsFD(FragmentFD):
|
|
"""
|
|
Download segments in a DASH manifest
|
|
"""
|
|
|
|
FD_NAME = 'dashsegments'
|
|
|
|
def real_download(self, filename, info_dict):
|
|
fragment_base_url = info_dict.get('fragment_base_url')
|
|
fragments = info_dict['fragments'][:1] if self.params.get(
|
|
'test', False) else info_dict['fragments']
|
|
|
|
ctx = {
|
|
'filename': filename,
|
|
'total_frags': len(fragments),
|
|
}
|
|
|
|
self._prepare_and_start_frag_download(ctx)
|
|
|
|
fragment_retries = self.params.get('fragment_retries', 0)
|
|
skip_unavailable_fragments = self.params.get('skip_unavailable_fragments', True)
|
|
|
|
for frag_index, fragment in enumerate(fragments, 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 = frag_index == 1 or not skip_unavailable_fragments
|
|
for count in itertools.count():
|
|
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)
|
|
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.
|
|
if count < fragment_retries:
|
|
self.report_retry_fragment(err, frag_index, count + 1, fragment_retries)
|
|
continue
|
|
except DownloadError:
|
|
# Don't retry fragment if error occurred during HTTP downloading
|
|
# itself since it has its own retry settings
|
|
if fatal:
|
|
raise
|
|
self.report_skip_fragment(frag_index)
|
|
break
|
|
|
|
if count >= fragment_retries:
|
|
if not fatal:
|
|
self.report_skip_fragment(frag_index)
|
|
continue
|
|
self.report_error('giving up after %s fragment retries' % fragment_retries)
|
|
return False
|
|
|
|
self._finish_frag_download(ctx)
|
|
|
|
return True
|