Automated Short Video Pipeline: Why Failure Gates Matter More Than Generation
enterthearena44 · reddit · 2026-08-29
The author shares lessons from building an automated pipeline for technical videos, emphasizing that preventing pipeline breaks is harder than generation itself.
Key Constraints & Design:
- Artifact Contracts: Strict build checks require scripts, deck code, speaker notes, and rendered assets to exist and validate.
- Slides as Code: Decks are generated as deterministic code adhering to an immutable design system, not free-form files.
- Multimodal QA Loop: Slides are rendered to PNG and fed to a vision model to catch layout collisions/overflow (LLMs can't reliably reason about text bounding boxes in code).
- Hard Script Constraints: Max 70 words/slide, sentences < 24 words. Auto-fail if limits are breached.
Failures Encountered:
- Silent patch updates deleting code blocks.
- Font metric mismatches causing text clipping.
- Drift between speaker notes and TTS inputs.
Conclusion: Layout & structure = 100% deterministic code; LLM = content generation & visual QA only.
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