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id, title, status, assignee, created_date, labels, dependencies, references, documentation, priority
| id | title | status | assignee | created_date | labels | dependencies | references | documentation | priority | ||
|---|---|---|---|---|---|---|---|---|---|---|---|
| TASK-196 | Fix subtitle prefetch cache-key mismatch and active-cue window | Done | 2026-03-18 16:05 |
|
high |
Description
Investigate and fix file-backed subtitle annotation latency where prefetch should warm upcoming lines but live playback still tokenizes each subtitle line. Likely causes: cache-key mismatch between parsed cue text and mpv sub-text, and priority-window selection skipping the currently active cue during mid-line starts/seeks.
Acceptance Criteria
- #1 Prefetched subtitle entries are reused when live subtitle text differs only by normalization details such as ASS
\N, newline collapsing, or surrounding whitespace. - #2 Priority-window selection includes the currently active cue when playback starts or seeks into the middle of a cue.
- #3 Regression tests cover the cache-hit normalization path and active-cue priority-window behavior.
- #4 Verification covers the touched prefetch/controller lane.
Implementation Plan
- Add failing regression tests in
subtitle-processing-controller.test.tsandsubtitle-prefetch.test.ts. - Normalize cache keys in the subtitle processing controller so prefetch/live paths share keys.
- Adjust prefetch priority-window selection to include the active cue.
- Run targeted tests, then SubMiner verification lane for touched files.
Outcome
Normalized subtitle cache keys inside the processing controller so prefetched ASS/VTT/live subtitle text variants reuse the same cache entry, and changed priority-window selection to include the currently active cue based on cue end time. Added regression coverage for both paths and verified the change with the core lane.