Fix exports that added a fake Intro clip, lost OFFSET footage, and broke YouTube chapters by t3dotgg · Pull Request #82 · pingdotgg/markerthing

t3dotgg · 2026-09-25T00:12:25Z

The exports had four bugs:

The CSV had a clip you never marked: "Intro", from 0 to your first marker.
An OFFSET marker ended the clip before it. Since #80 removed offset rows from the CSV, the footage between an OFFSET marker and the next marker was in no clip at all.
With an offset, the first YouTube chapter was moved to 00:00:00. So its label covered footage that was not part of that clip. This was an open review finding on #80.
YouTube ignores all chapters when one is shorter than 10 seconds. Chapter times include the 10s buffer, so a first marker at 0:12 gave a 2s Intro chapter. Two markers less than 10s apart did the same.

Now:

The CSV leaves out the fake Intro. YouTube chapters keep it.
OFFSET markers only set the offset. The clip before one runs to the next start or END marker.
With an offset, if the first clip starts after 00:00:00, an "Intro" chapter goes first. The clip keeps its real start.
When a chapter starts less than 10s after the one before it, the earlier chapter is dropped. The first chapter stays at 00:00:00. The CSV does not change.

Examples

OFFSET: "Chrome" at 30:00, "OFFSET 00:40:31" at 40:31, "React" at 50:00. Before, Chrome stopped at 40:31, and 40:31 to 50:00 was lost. Now Chrome runs to 50:00. In the offset CSV, Chrome was dropped. Now it is the first 9:29 of the camera footage.

Offset chapters: "Before camera" at 1:40, "END" at 5:00, "On camera" at 6:40, offset 5:50.

Before              After
00:00:00 On camera  00:00:00 Intro
                    00:00:40 On camera

Short chapters: "Chrome" at 0:12, "React" at 1:40, "Vue" at 1:45, "Svelte" at 5:00. Before, YouTube ignored all of these chapters.

Before              After
00:00:00 Intro      00:00:00 Chrome
00:00:02 Chrome     00:01:35 Vue
00:01:30 React      00:04:50 Svelte
00:01:35 Vue
00:04:50 Svelte

YouTube also needs at least 3 chapters. This PR does not check that.

Testing: pnpm test (33 pass, 2 new), typecheck, and lint pass. Each new or changed test fails on the old code.

Note for #81: it also edits src/utils/markers.ts and its tests, so it needs a small rebase. It has the same OFFSET fix, so that part conflicts but the logic is the same. Its "Number files" option numbers clips before toCsv, so the intro must be removed before numberLabels. If not, the first CSV clip is "02 ...". No function signatures change here. #81 does not edit toYouTubeChapters.

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Summary by CodeRabbit

Bug Fixes
- Corrected clip timing when offset markers are present, so they no longer end the preceding clip and segment times remain zero-based.
- Updated CSV exports to include marked clips without an extra intro row.
- Improved YouTube chapters: an Intro chapter appears when clips start later, chapters shorter than 10 seconds are omitted, and subsequent chapters are retained.

…ting clips short Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

vercel · 2026-09-25T00:12:27Z

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coderabbitai · 2026-09-25T00:12:34Z

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Walkthrough

Offset markers no longer end the preceding clip. The synthetic Intro segment is identified with isIntro. CSV output excludes that segment, and YouTube chapter generation adds an Intro when needed and omits chapters that are less than 10 seconds long.

Changes

Marker segments and exports

Layer / File(s)	Summary
Segment boundaries and intro identification `src/utils/markers.ts`, `src/utils/markers.test.ts`	The synthetic Intro segment receives an `isIntro` flag. Segment ends skip offset markers and use the next start or end marker, or the VOD duration. Tests cover offset marker timing and clip boundaries.
CSV export filtering `src/utils/markers.ts`, `src/utils/markers.test.ts`	LosslessCut CSV output excludes the synthetic Intro and retains marked clips. Tests verify the exported rows and clip end time.
YouTube chapter generation `src/utils/markers.ts`, `src/utils/markers.test.ts`	Chapter output adds an Intro at time zero when the first clip starts later. It omits chapters when the next chapter starts less than 10 seconds later. Tests cover both cases.

Priority: ➖ Normal

Estimated code review effort: 2 (Simple) | ~12 minutes

Change: Bug fix

Merge Risk: 🔵 Low · up to 14d65

Short final chapters can make some exported chapter lists invalid, though the normal player path avoids the demonstrated case. This is a bounded issue to fix or accept before merging.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the main changes: removing the synthetic Intro clip from exports, preserving OFFSET footage, and fixing YouTube chapters.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 4 functions across 2 files.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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greptile-apps · 2026-09-25T00:14:44Z

Confidence Score: 5/5

[Medium risk] Fixes clip boundary logic in video export markers.

The PR appears safe to merge based on the reviewed changes.

_{Reviews (2) · Last reviewed commit: "Drop YouTube chapters that are shorter t..."}

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

t3dotgg · 2026-09-25T00:22:14Z

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t3dotgg · 2026-09-25T00:34:14Z

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The test applies a 400s offset, but its OFFSET marker said 00:05:00 (300s). It now says 00:06:40. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

With an offset, the first remaining clip can start after 00:00:00. Its start was moved to 00:00:00, so its label covered footage that was not part of that clip. Now an "Intro" chapter goes at 00:00:00, and the clip keeps its real start time. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

YouTube ignores the whole chapter list when one chapter is shorter than 10 seconds. Chapter times include the 10s buffer, so a first marker at 0:12 gave "00:00:00 Intro" and "00:00:02 Chrome". Two markers less than 10s apart did the same. Now, when a chapter starts less than 10s after the one before it, the earlier one is dropped. If that was the first chapter, the next one moves to 00:00:00. The CSV does not change. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

t3dotgg · 2026-09-25T04:21:41Z

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t3dotgg · 2026-09-25T04:21:42Z

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coderabbitai · 2026-09-25T04:21:48Z

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Actionable comments posted: 1

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Inline comments:
In `@src/utils/markers.ts`:
- Around line 184-185: Update the chapter filtering logic that uses `next` and
`chapter.startTime` to compare against the next chapter’s start time when
present, or `chapter.endTime` for the final chapter; keep only chapters at least
`MIN_CHAPTER_SECONDS` long. Ensure any generated intro chapter has an `endTime`
so it follows the same rule.

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src/utils/markers.test.ts
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#82 took the fake intro out of the CSV. It now also stays out of the clip list, the timeline, and the numbering, so file numbers start at 01 with the first real clip. YouTube chapters still add their own Intro. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

Leave the fake intro out of the CSV, and stop offset markers from cut…

b828910

…ting clips short Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

vercel Bot deployed to Preview September 25, 2026 00:12 View deployment

greptile-apps Bot reviewed Sep 25, 2026

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Comment thread src/utils/markers.test.ts

Test that the offset CSV keeps a clip that spans an OFFSET marker

6a67ed6

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

vercel Bot deployed to Preview September 25, 2026 00:16 View deployment

t3dotgg and others added 3 commits September 24, 2026 21:09

Make the offset test's OFFSET label match its offset

7f5b6a9

The test applies a 400s offset, but its OFFSET marker said 00:05:00 (300s). It now says 00:06:40. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

vercel Bot deployed to Preview September 25, 2026 04:10 View deployment

t3dotgg changed the title ~~Drop the fake Intro from the CSV, and stop OFFSET markers from cutting clips short~~ Fix exports that added a fake Intro clip, lost OFFSET footage, and broke YouTube chapters Sep 25, 2026

t3dotgg mentioned this pull request Sep 25, 2026

Stop type errors from reaching production, and run tests and build in CI #85

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Comment thread src/utils/markers.ts

t3dotgg merged commit 272be82 into main Sep 25, 2026
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t3dotgg mentioned this pull request Sep 25, 2026

Rebuild the VOD page with a clip list and a clear camera export #81

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Fix exports that added a fake Intro clip, lost OFFSET footage, and broke YouTube chapters - #82

Fix exports that added a fake Intro clip, lost OFFSET footage, and broke YouTube chapters#82
t3dotgg merged 5 commits into
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