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fix(subtitle): rebase live-clock dash webvtt cues by presentationTimeOffset

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Live-to-VOD replays carry cue times on the live media clock, which overflowed the SRT conversion and dropped every cue.
This commit is contained in:
imSp4rky
2026-10-25 13:15:34 -06:00
parent cb2ffdb55a
commit 2dc458f8b4
3 changed files with 43 additions and 3 deletions
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tests/tracks/test_webvtt_merge.py
+14 -1
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@@ -10,7 +10,7 @@ survive, while duplicate headers collapse and boundary-duplicate cues dedupe.
from __future__ import annotations
from unshackle.core.utils.webvtt import merge_segmented_webvtt
from unshackle.core.utils.webvtt import merge_segmented_webvtt, rebase_webvtt, timestamp_ms
# Two segments, each a full WebVTT document with its own X-TIMESTAMP-MAP header,
# as they arrive concatenated from a DASH/HLS subtitle stream. The first cue carries
@@ -118,3 +118,16 @@ def test_merge_skips_malformed_timing_line():
out = merge_segmented_webvtt(vtt)
assert "Good" in out
assert "Broken" not in out
def test_rebase_moves_live_clock_cues_to_zero():
vtt = "WEBVTT\n\n498024:05:44.300 --> 498024:05:44.829 line:0.01%\nText\n"
out = rebase_webvtt(vtt, timestamp_ms("498024:00:14.700"))
assert "00:05:29.600 --> 00:05:30.129 line:0.01%\nText" in out
def test_rebase_leaves_presentation_time_cues_alone():
# a second pass, or a VOD period with a non-zero offset, must not shift again
vtt = "WEBVTT\n\n00:05:29.600 --> 00:05:30.129\nText\n"
assert rebase_webvtt(vtt, 1_792_886_414_700) == vtt
assert rebase_webvtt(vtt, 0) == vtt