EP_MUSASHI, the reverse-engineered episode
The full source of one forgotten_fronts episode: the Wikipedia article, the 19-shot contact sheet, the audio, the claims audit, the drift bug and its fix. Every artefact the channel would want to see.
The contact sheet, every shot, the line, the timestamp
This is what the audience sees, frame by frame. 19 stills from the Wikipedia article, each captioned with the line the narrator says during that shot and the timestamp window. The same JSON the build pipeline used to generate the MP4, rendered as a single page.
Image URLs point to the raw GitHub repo so the brand can verify each shot independently against the source.
The claims audit, what the source actually says
Every factual claim in the episode was checked against the Wikipedia article on 2026-10-25. 33 confirmed, 16 dropped (cut before the caption was finalised, because the source did not support them).
This is the audit gate in action: a claim only goes in if the source states it. Two drops means the caption got 2.6% more honest. The Wikipedia MCP at get_article_summary was the source pull, canonical URL + revision id, zero credits per call.
| Claim | Verdict |
|---|---|
| Miyamoto Musashi was a Japanese swordsman, strategist, and writer. | confirmed |
| Musashi founded the Niten Ichi-ryū style of swordsmanship. | confirmed |
| Musashi authored The Book of Five Rings. | confirmed |
| Musashi defeated Sasaki Kojirō at Ganryū Island. | confirmed |
| Musashi defeated Sasaki Kojirō in 1612. | unsourced |
| Musashi requested Hosokawa Tadaoki to organize the encounter. | confirmed |
| Musashi remained undefeated in sixty-two duels. | confirmed |
| Musashi died on June 13, 1645. | confirmed |
| The duel occurred on April 13. | confirmed |
| The duel occurred in 1612. | unsourced |
| The duel took place at Ganryū Island. | confirmed |
| Hosokawa Tadaoki organized the time and place of the duel. | confirmed |
| Kojirō was known for fighting with a nodachi. | confirmed |
| A nodachi is a sword with a long blade. | confirmed |
| Musashi carved an oar into a wooden bokken during his boat journey to the island. | confirmed |
| Musashi deliberately arrived late. | confirmed |
| Kojirō lost his patience while waiting. | confirmed |
| Kojirō taunted Musashi for arriving late. | confirmed |
| Musashi remained composed. | confirmed |
| Musashi crushed Kojirō's skull with a vertical stroke using the wooden sword. | confirmed |
| The vertical stroke was a single decisive strike. | confirmed |
| Musashi later proclaimed that Sasaki Kojirō was the strongest opponent he ever faced. | unsourced |
| Miyamoto Musashi is the subject of the first shot. | confirmed |
| The first shot should depict an Edo-period print or painting. | unsourced |
| The second shot concerns a sword or swordsman and samurai at rest. | unsourced |
| The second shot should use an Edo-period Japanese print or painting. | unsourced |
| The year associated with the duel is 1612. | unsourced |
| The third shot should depict an Edo-period Japanese ink painting or old map. | unsourced |
| Hosokawa Tadaoki is associated with the duel commission. | confirmed |
| Hosokawa Tadaoki is shown writing an official duel commission. | unsourced |
| Ganryū Island hosted the duel between Musashi and Kojirō. | confirmed |
| A wide shot of Ganryū Island's coastline is requested. | unsourced |
| Kojirō wielded a nodachi. | confirmed |
| The nodachi extended Kojirō's reach. | unsourced |
| Musashi carved an oar into a bokken. | confirmed |
| Musashi arrived deliberately late to the island shore. | confirmed |
| Musashi's composure contrasted with Kojirō's impatience. | confirmed |
| Musashi's composure became psychological warfare. | unsourced |
| The duel began on Ganryū Island. | confirmed |
| The duel began on sand. | unsourced |
| Kojirō lost his composure before the clash. | confirmed |
| A single vertical strike ended the duel. | confirmed |
| Musashi's victory came from the wooden sword. | confirmed |
| Mature Musashi reflected on past battles. | unsourced |
| The duel represents a tradition of the duel. | unsourced |
| Musashi turned from history toward innovation. | unsourced |
| Musashi's improvisation founded Niten Ichi-ryū. | contradicts |
| Niten Ichi-ryū used two-sword techniques. | confirmed |
| Musashi created the legendary Niten Ichi-ryū style. | confirmed |
| Niten Ichi-ryū is represented by a two-sword stance or scroll. | confirmed |
The drift bug, and its fix
The first build (EP_MUSASHI_pre-drift-fix.mp4) shipped with the same caption/picture drift bug that EP_SPEEDMASTER hit. plan_shots.py built the shot list from the spoken-span only, 5.16 seconds of pauses were missing, and the builder rescaled every shot by 1.1479 to fit. The pictures walked ahead of the captions until they were 2.7 seconds out by the end of the video.
7 of 19 shots showed the wrong picture under the caption. Segment 2's frame showed "instead of steel? In 1612," which is two different lines than shot 2's own. The fix: plan_shots.py gives each shot the pause in front of it; the builder anchors every boundary to the words. scripts/common/repair_drift.py re-plans and rebuilds an episode. This file documents one re-plan, one re-build, and a clean gate.
The QA gate reliability, what actually happened
One pass. Two findings. Both false positives.
| What Gemini said | What the frame actually was |
|---|---|
| 0:12 "Modern photograph of a sword" | Edo-period woodblock print of a samurai with a long sword |
| 0:36 "Dynamic captions overlap" | Japanese woodblock print of pilgrims under a moon; caption fully on screen |
Same pattern as Speedmaster: the gate misreads period artwork as modern, and treats woodblock prints as "infographics." No real defects were found in the rebuilt MP4. Open the frame before acting on any "modern" finding.
The closing promise, the next episode on the channel
The closing caption of this episode points at the next subject: The Book of Five Rings (EP_BOOK_OF_FIVE_RINGS.mp4, built, ready to ship, 2.4 MB). The next-subject signal lives in EP_MUSASHI/closing_next in the brief JSON.