34 lines
2.3 KiB
Markdown
34 lines
2.3 KiB
Markdown
# TASK 53 — Output-format verification: Shorts / TikTok geometry (queued 2026-10-08)
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> Catalog: [`TASKS.md`](../TASKS.md) — status and requirements live here.
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**Why:** the output formats have never been tested end-to-end. The site claims "vertical 1080p60
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(9:16)" and Shorts-style streams, but nobody has verified that the geometry actually comes out
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correct for Shorts and TikTok — safe zones, caption clearance, and the text-safe inset all still
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need checking against a real capture.
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**Goal:** prove the vertical/short-form path is geometrically correct, or fix the gaps and then
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prove it. Make the output formats a tested, locked contract instead of an assumption.
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**Slices (one integration test each, in order):**
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1. ☐ **What we actually emit** — enumerate the real encoding configurations (widescreen 1080p60/
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1080p30/720p60/720p30 + vertical 9:16 1080p60) and pin them in one place (`FfmpegArgs`-adjacent),
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each with its own geometry contract test. This turns "formats exist" into "formats are defined".
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2. ☐ **9:16 geometry** — vertical render must be true 1080×1920 (or the GUP-negotiated size) with
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the composite laid out for a phone: viewer-safe top strip (TikTok/Shorts overlays live top-left
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and bottom), caption/text clearance, and the webcam not cropped off-centre. Test: composite a
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known layout, decode the output frame, assert dimensions + element placement vs the contract.
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3. ☐ **Live-shorts check on a real stream** — private Test Stream at 9:16, then pull the thumbnail/
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player quirk list from YouTube (Title visible, overlays); confirm nothing the streamer put on
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screen sits under YouTube's own chrome. This is the "never tested" item the creator flagged —
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test on a real vertical test stream and cite the observation.
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4. ☐ **Recorded .mp4 matches output** — the saved vertical .mp4 must carry the same 9:16 frame the
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stream showed, not a squeezed/wider master. Test: record vertical, decode first frames, assert.
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**Design decisions:**
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- Geometry is a contract with tests, not a hope. Derived ratios (stream vs composite vs canvas)
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get a derived-value test so one change can't silently wreck Shorts/TikTok output.
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- Keep widescreen untouched — only add what vertical needs (the existing test suite stays green
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for 16:9). |