TES-8: Change how videos are generated

[austinjiann]

Ticket

• TES-8

Summary

Run Summary

TES-8: Change how videos are generated

Changes Made

1. Updated video model to veo 3.1 (full quality)

• File: backend/services/vertex_service.py (line 25)
• Before: veo-3.1-fast-generate-001
• After: veo-3.1-generate-001
• The "fast" variant was replaced with the standard veo 3.1 model, which produces higher quality output suitable for realistic video generation.

2. Updated system prompt for realistic output

• File: backend/utils/prompt_builder.py (lines 2-9)
• Changed "creative" to "realistic" in the generation directive.
• Replaced the generic style instruction ("visually engaging and dynamic, stay true to the style of the source material") with explicit realism instructions: photorealistic rendering, real-world physics, natural lighting/textures, cinematic live-action look, and an explicit directive to avoid cartoon/anime/illustrated styles.
• Fixed a typo: "momvement" → "movement".

Testing

• No automated test suite exists in this project (no pytest, jest, vitest, or test files found).
• Python syntax validation passed for both modified files.
• Frontend TypeScript compilation (tsc --noEmit) passed with no errors.

Changed Files

• ackend/services/vertex_service.py
• backend/utils/prompt_builder.py

Test Results

• Passed: 2

• Failed: 0

• python3 -m py_compile backend/services/vertex_service.py — passed

• python3 -m py_compile backend/utils/prompt_builder.py — passed

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated (UTC)
flowboard	Ready	Preview, Comment	Mar 19, 2026 10:23pm