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[dash,youtube] Download live from start to end (#888)

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* Add option `--live-from-start` to enable downloading live videos from start
* Add key `is_from_start` in formats to identify formats (of live videos) that downloads from start
* [dash] Create protocol `http_dash_segments_generator` that allows a function to be passed instead of fragments
* [fragment] Allow multiple live dash formats to download simultaneously
* [youtube] Implement fragment re-fetching for the live dash formats
* [youtube] Re-extract dash manifest every 5 hours (manifest expires in 6hrs)
* [postprocessor/ffmpeg] Add `FFmpegFixupDuplicateMoovPP` to fixup duplicated moov atoms

Known issue: Ctrl+C doesn't work on Windows when downloading multiple formats

Closes #1521
Authored by: nao20010128nao, pukkandan
This commit is contained in:
The Hatsune Daishi
2021-12-20 15:06:46 +09:00
committed by GitHub
parent c031b0414c
commit adbc4ec4bb
15 changed files with 355 additions and 100 deletions
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68
yt_dlp/downloader/dash.py
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@@ -1,4 +1,5 @@
from __future__ import unicode_literals
import time
from ..downloader import get_suitable_downloader
from .fragment import FragmentFD
@@ -15,27 +16,53 @@ class DashSegmentsFD(FragmentFD):
FD_NAME = 'dashsegments'
def real_download(self, filename, info_dict):
if info_dict.get('is_live'):
if info_dict.get('is_live') and set(info_dict['protocol'].split('+')) != {'http_dash_segments_generator'}:
self.report_error('Live DASH videos are not supported')
fragment_base_url = info_dict.get('fragment_base_url')
fragments = info_dict['fragments'][:1] if self.params.get(
'test', False) else info_dict['fragments']
real_start = time.time()
real_downloader = get_suitable_downloader(
info_dict, self.params, None, protocol='dash_frag_urls', to_stdout=(filename == '-'))
ctx = {
'filename': filename,
'total_frags': len(fragments),
}
requested_formats = [{**info_dict, **fmt} for fmt in info_dict.get('requested_formats', [])]
args = []
for fmt in requested_formats or [info_dict]:
try:
fragment_count = 1 if self.params.get('test') else len(fmt['fragments'])
except TypeError:
fragment_count = None
ctx = {
'filename': fmt.get('filepath') or filename,
'live': 'is_from_start' if fmt.get('is_from_start') else fmt.get('is_live'),
'total_frags': fragment_count,
}
if real_downloader:
self._prepare_external_frag_download(ctx)
else:
self._prepare_and_start_frag_download(ctx, info_dict)
if real_downloader:
self._prepare_external_frag_download(ctx)
else:
self._prepare_and_start_frag_download(ctx, fmt)
ctx['start'] = real_start
fragments_to_download = self._get_fragments(fmt, ctx)
if real_downloader:
self.to_screen(
'[%s] Fragment downloads will be delegated to %s' % (self.FD_NAME, real_downloader.get_basename()))
info_dict['fragments'] = fragments_to_download
fd = real_downloader(self.ydl, self.params)
return fd.real_download(filename, info_dict)
args.append([ctx, fragments_to_download, fmt])
return self.download_and_append_fragments_multiple(*args)
def _resolve_fragments(self, fragments, ctx):
fragments = fragments(ctx) if callable(fragments) else fragments
return [next(fragments)] if self.params.get('test') else fragments
def _get_fragments(self, fmt, ctx):
fragment_base_url = fmt.get('fragment_base_url')
fragments = self._resolve_fragments(fmt['fragments'], ctx)
fragments_to_download = []
frag_index = 0
for i, fragment in enumerate(fragments):
frag_index += 1
@@ -46,17 +73,8 @@ class DashSegmentsFD(FragmentFD):
assert fragment_base_url
fragment_url = urljoin(fragment_base_url, fragment['path'])
fragments_to_download.append({
yield {
'frag_index': frag_index,
'index': i,
'url': fragment_url,
})
if real_downloader:
self.to_screen(
'[%s] Fragment downloads will be delegated to %s' % (self.FD_NAME, real_downloader.get_basename()))
info_dict['fragments'] = fragments_to_download
fd = real_downloader(self.ydl, self.params)
return fd.real_download(filename, info_dict)
return self.download_and_append_fragments(ctx, fragments_to_download, info_dict)
}