One Sentence In, Stereo Video Out: 6 Jobs, 90–790 Seconds, an Unfilmed Actress

Episode 7 of One Man One Legion — the fourth stop in the workshops arc, after the image workshop, the text factory, and the quality gate. An earlier dispatch measured InfiniteTalk 14B on this same dual-GPU rig; this is the other video bench — the one that takes orders from a chat window.

A text-to-video model answers a question every owner eventually asks: what stands between “a model that can generate video” and “a workshop I can order from chat”? This bench’s answer took shape in a single day, then spent a week teaching its owner what the model actually listens to. The deployment guide’s first line is the whole ambition, dated Aug 6, 2026: one sentence in, an MP4 out, without ever opening the generator’s web interface.

Getting the template was the first craft

ComfyUI ships new-model templates as packed group nodes that the automation API refuses to accept — and gives no export button. The workaround, recorded in the guide as a reusable trick: load the template once in the UI, queue one run, then pull the executed job’s history and grab the workflow JSON the backend expanded on its own. That becomes a 17-node API template — 18 nodes for reference-to-video — with five fields parameterized: prompt, duration, resolution, seed, steps. One quantization trap was mapped the same day: the text encoder ships as int8 weights because the 4090 doesn’t support the model’s other quantization format.

Six jobs, three price points

#	Date	Prompt	Clip	Render	Size
1	Aug 6	skeleton test: cat on a windowsill	3s	90s	0.2 MB
2	Aug 6	two stray dogs fighting at a village entrance	3s	90s	0.5 MB
3	Aug 7	boxy Chinese luxury SUV, slow drive	5s	138s	1.3 MB
4	Aug 7	same SUV, second take	5s	138s	1.6 MB
5	Aug 7	same SUV, commercial phrasing	5s	138s	1.3 MB
6	Aug 14	FPV drone chase of a tight formation	10s	790s	2.1 MB

The ladder is the story: 3 seconds cost 90, 5 seconds cost 138 — three takes of one commercial, timing identical to the second — and 10 seconds cost 790. Doubling the clip from 5 to 10 seconds multiplied render time by 5.7. The card runs the model through weight offload, and the shop’s own waiting message says so: minutes to tens of minutes, please be patient. Across all six jobs, 31 seconds of finished video cost 1,384 seconds of GPU time — a 44.6:1 render tax. Total inventory: 11 MP4s on disk, the 6 job outputs plus 5 deployment-day tests.

The pipeline delivers itself

A video takes 90 seconds to 13 minutes; any agent that waits synchronously times out. So the launch command returns instantly, the agent replies with a time estimate and exits, and the generation script — not the agent — posts the finished video back to the chat group on completion, captioned with its prompt and seed. 5 of the 6 jobs did exactly that, each leaving a delivery receipt in its log; the first skeleton test was not sent. Nobody polls. The video arrives because the script, not a person and not an agent, is holding it.

The only red line

The deployment notes are unusually blunt about motive: a local model has no content filter, and that is the purpose of building it. Deployment day included four named probes — baseline, horror, war, weapon — and all four rendered. The skill’s standing rule draws exactly one hard line: child sexual abuse material is refused on the spot. Everything else is the agent’s judgment call, and the agent is the filter.

The director

By Aug 10 the bench had a second skill: a director that turns one sentence into a storyboard. Its core doctrine is subtraction. Every prompt carries a motion budget — 1 primary motion, at most 2 secondary, 2 environmental, 1 camera move, at most 1 expression change — and the rule of thumb reads: brainstorm ten actions, keep the 3 that matter, delete the other 7. Describe physics, not choreography; write a continuous state, not timestamped events. The bench also keeps a character bible: a 30-year-old Asian woman photographer with five written visual anchors, from a mole near her left eyebrow to a silver film camera that must appear in every frame.

The director’s claims weren’t taken on faith. An 8-cell test matrix ran the same day at 15 steps: 3 clean passes, 2 failures, 2 retries markedly improved, 1 cell left unmarked. The findings are now codified rules — a local eye defect is cured by changing the seed, not the prompt; a dark scene needs the light source written in; original photos preserve identity better than generated intermediate images. The next day a second model was put through the same discipline, pitfall table and all.

The honest column

The pipeline ships with a result tracker that records every run’s seed, parameters, quality notes, and identity drift — the feedback loop this series keeps praising in other workshops. Its history file has never been created: zero entries. The actress is cast, her wardrobe locked, three scenes staged. She has not filmed a shipped frame. Built is not shipped — and this time the shop’s own empty log file is the evidence.

Back to the fleet audit.