zeta-editor - Retrospective

What Went Well

Structured QC process paid off. Running ffprobe on both renders immediately surfaced the resolution, duration, and file size compliance. All hard verification checklist items passed on the first check.
Audio coverage mapping was the right approach. Creating a second-by-second audio coverage map (documented in editor_qc_report.md) made the 21-second silence gap at 134-155s immediately visible. Without this systematic approach, the gap could have shipped unnoticed.
Diegetic audio extraction was straightforward. Using ffmpeg to pull audio from Veo 3.1 dailies was a clean operation. The clips had high-quality audio (139-256kbps AAC) that the assembly pipeline had been silently discarding.
TechLead responded fast to the music request. Delivered the escape score within minutes of the QC report. Clear, actionable communication worked.
Timeline JSON format is powerful. Being able to add tracks, adjust volumes, and position clips with per-clip granularity made the v3 revision possible without re-generating any assets.

Joined too late. I was started after the team had already completed all 7 production steps. The brief says “Immediate Task: Collaborate on Step 1” but the film was already in final assembly. I had no influence on pacing, shot selection, or the Musical Arc decisions made in Steps 2/6. The Gated Milestone Protocol (checking in at each step) was never exercised.
The assembly pipeline silently strips diegetic audio. The assemble.py script and the trim_clip function both use the -an flag, which discards all audio from video clips. This means Veo 3.1’s generated dialogue, piano sounds, and ambient audio — central to the story — were completely absent from the final mix. Neither the TechLead nor I caught this until my QC audit.
40-second music gap in the climactic sequence. The score was composed in 3 movements (Approach, Mechanism, Resolution) with a deliberate gap that accidentally left the most emotionally charged section of the film — the escape — completely silent.

Late start = context deficit. I had to reconstruct the entire production state from file system artifacts rather than having participated in the creative decisions. This is inherently fragile.
No way to preview audio in the rendered file. I can probe file metadata and analyze timeline structure, but I cannot actually listen to the output. All audio quality assessments are based on bitrate analysis, coverage mapping, and structural review rather than perceptual evaluation.
Timeline tool xfade bug forced the manual assemble.py workaround. The TechLead wrote a custom Python pipeline because genmedia-assemble timeline had an xfade chain offset bug. This workaround introduced the -an audio stripping as a side effect.

Rejected v1/v2 for final archive. Despite Coach approval of v2, I identified the 21-second silence gap and chose to produce v3 with fixes rather than accept a known-deficient master. v2 remains the official submission; v3 is the “director’s cut.”
Chose diegetic audio extraction over TTS dialogue generation. Rather than asking TechLead to generate separate TTS stems for each character line (Sterling, Arthur, Clara), I extracted the Veo-generated diegetic audio from the original dailies. This preserved the original Veo audio performance and was significantly faster. Tradeoff: the diegetic audio quality may be inconsistent since Veo’s audio generation is not deterministic.
Bridged the 65-69s mini-gap by extending mvt2 start from 69s to 64s. The mechanism score is 70s long but was only using 65s. Starting it 5s earlier closes the gap between movements 1 and 2 with a natural crossfade.
Used per-clip volume boosts for Scene 5 diegetic audio. Since Scene 5 has no musical underscore (even with the escape score, it fades in gradually), I boosted the diegetic bed clips for shots 20-23 by +8dB (track base -10 + clip +8 = -2dB effective) so the frantic piano and dialogue carry the scene.

Start the Editor at Step 1. The Editor’s role in defining the Musical Arc (Step 2) and reviewing dailies in parallel (Step 5) requires being present from the beginning. Starting late undermines the entire role.
Preserve diegetic audio by default. The assembly pipeline should NOT use -an. Instead, strip audio only when explicitly requested. Diegetic audio from Veo 3.1 is a valuable asset — character dialogue, ambient sounds, and foley that would otherwise need to be generated separately.
Add a diegetic audio track to the timeline template. Future teams should include a diegetic-bed track in their timeline from the start, mapping each video clip’s audio at reduced volume. This is easy to set up and prevents the “silent film” problem.
Audio coverage map should be a mandatory Step 6 deliverable. Before moving to Step 7, the Editor should produce a visual second-by-second audio coverage map and verify there are no gaps exceeding 3 seconds (except for intentional silence).
The timeline tool should support a --preserve-video-audio flag that automatically mixes the original video clip audio at a configurable level underneath the composed tracks. This would eliminate the need for manual diegetic audio extraction.