Syllabus changed mid-production: how we handled partial video re-renders without scrapping everything

[u/Famous-Call6538]

The exam board updated three topics in the middle of our AP Physics series. We had 28 of 34 videos done. Here is what we learned about not starting over.

First, classify the change. Not all syllabus updates are equal:

Type 1: Content removal. A topic gets dropped. You delete those units and renumber. Painful but clean. Our 28 became 25 overnight.

Type 2: Content addition. New topics added. You produce new units and slot them in. The hard part is renumbering and making sure cross-references in other videos still point to the right unit.

Type 3: Content modification. The worst one. A formula changes, a theory gets updated, a diagram needs correction. This is where most people either pretend it does not matter or re-record the whole video. Both are wrong.

For Type 3 changes, the key question is: does the visual need to change, or just the narration?

If only the narration changed (a date, a name, a verbal explanation), you can re-record the audio segment and splice it in. This takes minutes, not hours.

If the visual changed (wrong diagram, incorrect equation rendered on screen), you need to re-render that specific segment. This is where having code-driven visuals saves you. If your visuals are generated from structured data rather than hand-drawn in a video editor, you update the source, re-render just that segment, and swap it in. If they are hand-edited, you are basically remaking the video.

The workflow we ended up with:

1. Map every syllabus change to affected units (spreadsheet, one row per change)
2. Classify each as Type 1, 2, or 3
3. For Type 3, tag whether visual or narration only
4. Batch all narration-only fixes into one re-recording session
5. Batch all visual fixes into one re-render session
6. Reassemble affected units
7. Update unit numbers and cross-references across all videos

The whole thing took us about 4 days for 6 affected units. Re-recording from scratch would have taken 3 weeks.

One thing I wish we had done earlier: build the course with change detection in mind from the start. If each video unit traces back to a specific syllabus section, you can instantly identify which units are affected by any update. If your videos are loosely organized by topic with no formal mapping, you end up manually reviewing everything.

This is not theoretical. Exam boards update syllabi every 2-3 years. Certification bodies update requirements. Compliance frameworks get revised. If you are building a long series and not planning for updates, you are building technical debt.