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Add infrastructure for paged lists

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This commit allows to download pages in playlists as needed instead of all at once.
Before this commit,
    youtube-dl http://www.youtube.com/user/ANNnewsCH/videos --playlist-end 2 --skip-download
took quite some time - now it's almost instantaneous.
As an example, the youtube:user extractor has been converted.
Fixes #2175
This commit is contained in:
Philipp Hagemeister
2014-01-20 11:36:47 +01:00
parent c91778f8c0
commit b7ab059084
4 changed files with 92 additions and 25 deletions
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23
youtube_dl/YoutubeDL.py
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@@ -39,6 +39,7 @@ from .utils import (
locked_file,
make_HTTPS_handler,
MaxDownloadsReached,
PagedList,
PostProcessingError,
platform_name,
preferredencoding,
@@ -575,19 +576,27 @@ class YoutubeDL(object):
playlist_results = []
n_all_entries = len(ie_result['entries'])
playliststart = self.params.get('playliststart', 1) - 1
playlistend = self.params.get('playlistend', None)
# For backwards compatibility, interpret -1 as whole list
if playlistend == -1:
playlistend = None
entries = ie_result['entries'][playliststart:playlistend]
n_entries = len(entries)
self.to_screen(
"[%s] playlist '%s': Collected %d video ids (downloading %d of them)" %
(ie_result['extractor'], playlist, n_all_entries, n_entries))
if isinstance(ie_result['entries'], list):
n_all_entries = len(ie_result['entries'])
entries = ie_result['entries'][playliststart:playlistend]
n_entries = len(entries)
self.to_screen(
"[%s] playlist %s: Collected %d video ids (downloading %d of them)" %
(ie_result['extractor'], playlist, n_all_entries, n_entries))
else:
assert isinstance(ie_result['entries'], PagedList)
entries = ie_result['entries'].getslice(
playliststart, playlistend)
n_entries = len(entries)
self.to_screen(
"[%s] playlist %s: Downloading %d videos" %
(ie_result['extractor'], playlist, n_entries))
for i, entry in enumerate(entries, 1):
self.to_screen('[download] Downloading video #%s of %s' % (i, n_entries))