epsilon-techlead - Retrospective

What Went Well

Rig Synthesis: Successfully built and compiled a full suite of production tools (epsilon-imagen, epsilon-nanobanana, epsilon-veo, epsilon-voice, epsilon-lyria, epsilon-assembler) using reference code from the gamma-rig.
Recursive Multi-Segment Strategy: Successfully implemented a recursive extension loop using VEO’s state-seeding to fulfill the 15s+ (target+30%) duration mandate. Using First-Last anchoring for the base segment ensured storyboard fidelity.
DNA Consistency: Maintained high textural fidelity (Crystalline Obsidian, Amber Heartbeat, Organic Resolution) across 16 shots and three distinct visual arcs.
Team Integration: Exceptional coordination with the Idea Person (Creative Director) and Editor. The shared technical watch on background logs ensured rapid verification and alignment.
Rapid Recovery: Successfully identified and bypassed model safety triggers (e.g., in Shot 5 and Shot 14) by retuning prompts while maintaining creative intent.

Initial Resolution Snag: The initial rig test (Shot 1) resolved at 720p due to default VEO Fast settings. Had to switch to standard VEO and explicitly force the 1080p resolution parameter.
Extension Duration Limits: Discovered a strict 7s limit on VEO extensions (attempting 8s caused silent segment failures). Patched the rig to respect the 7s constraint.
Audio Codec Discrepancy: Initial voice assets were generated as PCM WAV but mislabeled as .mp3, causing technical debt for the Editor. Resolved via FFmpeg transcoding to true PCM WAV.

VEO Render Latency: Standard 1080p VEO synthesis (non-Fast) is significantly slower, creating a bottleneck for the multi-segment recursive loop.
Safety Filter Sensitivity: The “crumbling” and “black dust” prompts for Scene 6 triggered the model’s safety guardrails, requiring two retuning cycles.
Recursive Logic Complexity: Manually managing the segment handoffs and GCS uploads for extension seeding increased procedural friction.

Standard VEO over VEO Fast: Sacrificed speed for the 1080p resolution mandate.
Recursive Extension Strategy: Rejected simple concatenation of independent clips in favor of recursive state-seeding to ensure visual continuity.
Refined Stitching: Integrated the Editor’s custom stitch command into the synthesis rig to ensure the final assets met post-production standards.
True PCM WAV: Chose to transcode voice assets to real WAV for maximum downstream compatibility in the Final Assembly rig.

Rig Defaulting: Synthesis rigs should default to 1080p and production-grade durations (15s+) in turn 1 to prevent technical debt.
Automated Resume Logic: Synthesis scripts should include part-existence checks (implemented mid-session) from the start to survive transient API timeouts.
Pre-Validation of Prompt DNA: Test complex physics prompts (like crumbling architecture) early in the storyboard phase to identify safety triggers before principal photography.