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[downloader/hls] Remove duplicate cues using a sliding window of candidates

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This commit is contained in:
Felix S
2021-04-23 10:52:21 +02:00
parent 4a2f19abbd
commit 333217f43e
2 changed files with 35 additions and 0 deletions
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25
yt_dlp/downloader/hls.py
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@@ -325,6 +325,31 @@ class HlsFD(FragmentFD):
if isinstance(block, webvtt.CueBlock):
block.start += adjust
block.end += adjust
dedup_window = extra_state.setdefault('webvtt_dedup_window', [])
cue = block.as_json
# skip the cue if an identical one appears
# in the window of potential duplicates
# and prune the window of unviable candidates
i = 0
skip = True
while i < len(dedup_window):
window_cue = dedup_window[i]
if window_cue == cue:
break
if window_cue['end'] >= cue['start']:
i += 1
continue
del dedup_window[i]
else:
skip = False
if skip:
continue
# add the cue to the window
dedup_window.append(cue)
elif isinstance(block, webvtt.Magic):
# XXX: we do not handle MPEGTS overflow
if frag_index == 1: