Adds the data-driven tier — a purpose-built fixture (option 2 from the
stack discussion, not a port of PR #214's examples/remotion-full/) that
exercises the realistic shape of a production Remotion composition
without using the runtime adapter.
Stargazed.tsx (10s @ 30fps, 1280x720):
Sequence 0-3s TitleScene (title + subtitle)
Sequence 3-7s StatsScene (3 reused StatCards staggered 12 frames apart)
Sequence 7-10s OutroScene (UnderlinedText with scaleX-from-left underline)
Composition shape exercises:
- <Composition schema={z.object({...})} defaultProps={...} />
- nested array prop (stats[]) materialized as repeated HTML
- custom React subcomponents (StatCard, AnimatedNumber, UnderlinedText)
reused with different props
- per-instance delay via prop (delayInFrames -> GSAP timeline offset)
- frame-driven count-up (AnimatedNumber, manual cubic ease-out)
- two different spring configs in the same composition
(damping:12 -> back.out(1.4), damping:14 -> back.out(1.2))
- useCurrentFrame, useVideoConfig
Translation choices documented in README.md and expected.json:
- Zod props -> data-* on root #stage div
- Custom subcomponents inline as repeated HTML using prop interface
as the template
- AnimatedNumber's frame-driven count-up -> GSAP onUpdate tween on a
{ v: 0 } counter object, ease power3.out
- Two different spring configs -> two different back.out overshoots
(1.4 vs 1.2 approximates the damping difference)
- delayInFrames={i * 12} -> GSAP offset (i * 0.4)s
Validated end-to-end: rendered Remotion baseline + HF translation, ran
scripts/render_diff.sh.
measured mean SSIM 0.953
measured min SSIM 0.927
measured p05 SSIM 0.938
threshold 0.90 (~0.04 below p05)
The wider gap vs T1/T2 reflects T3's bigger approximation budget
(2 spring instances + count-up timing + font fallback on multiple text
sizes). Mean SSIM below 0.90 = structural mismatch (wrong durations,
wrong stagger, missing prop wiring), not approximation drift.
Same Remotion config as PR 3: setVideoImageFormat("png") +
setColorSpace("bt709") to match HF's yuv420p output.
Lint: 9 files scanned, 0 blockers / 0 warnings / 0 infos.
oxlint, oxfmt, typecheck all pass.
The fixture is not yet wired into CI; render + diff is documented in
README.md and runs by hand via the harness from PR 2. PR 7's orchestrator
will wire all four tiers into a CI eval run.
