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slides: square slides for vertical short-form video

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Use when: a locked script (see workflows/preproduction) needs 10–15 visual slides to pair with talking-head footage in a vertical video — dropped into Descript’s chapter-title split, a CapCut/剪映 top-half layout, or a HyperFrames composition. Inputs: the script + a slide plan. Outputs: slide_<key>.png (1080×1080 by default, or a platform full-frame canvas) per slide, plus ≤3 slide_<key>.mp4 animated diagram clips.

Run from the project folder; $VSTUDIO = repo root.

Prerequisites

Section titled “Prerequisites”
  • ./install.sh (fonts). Chrome/Chromium/Edge for PNGs (found via $CHROME, PATH or standard install paths).
  • Animated clips only: pip install playwright && playwright install chromium.

Pipeline

Section titled “Pipeline”

  1. Slide plan. One slide every 6–12 s of narration → 10–14 slides for a 90 s short. Typical order:

    # Preset class Purpose
    01 s-title hook headline (same sentence as the spoken hook and the cover)
    02 s-contrast the misconception / “you” framing
    03 s-three optional preview of the 3 parts
    04, 08, 11 s-sec section headers: giant accent number + word
    05, 10 s-punch one big sentence per idea (optional eyebrow)
    06, 09, 13 s-bars, s-attn, s-ctx diagrams: the visual proof (bars, arrows, stack)
    12 s-nomem one giant word
    14 s-recap key → value rows
    last s-outro the closing lens (no generic CTA)

  2. Write the deck. cp $VSTUDIO/workflows/slides/templates/slides_vertical.template.html work/slides.html. One <section class="slide <preset>" data-key="NN_name"> per slide; reuse the presets (they cover ~90 % of needs) and only add a class when a slide is structurally new. Open it in a browser: keys 1–9, 0, q–t flip slides. Check each slide before rendering: content centred, nothing overflowing the canvas, accent visible, diagram geometry intact (arrows land on their words, bars span correctly).

  3. Render PNGs. python3 $VSTUDIO/workflows/slides/scripts/render_slides.py work/slides.html work/slides/ (all data-keys by default; list keys to re-render a few; --platform / --layout full for full-frame slides, see Platforms; --accent "#hex" for a one-off accent).

  4. Optional: animated diagrams (max 3 per video). python3 $VSTUDIO/workflows/slides/scripts/record_slides.py work/slides.html work/slides/ 06_bars:3.4 09_attn:4.0 13_resend:4.2 The narration over each animated slide must be at least as long as the recording, or it loops/freezes early. Takes the same --platform / --layout / --size / --accent flags as render_slides.py. Output: H.264 yuv420p, --fps 25 (Playwright records ~25), CRF from persona export.crf. Animate only where motion is the explanation (bars growing, arrows drawing, a stack building); animating everything makes the video restless.

  5. Place on the timeline in key order (slide_NN_* sorts deterministically): in workflows/talkinghead as BROLL entries with mode="split" (slide on top, speaker below) or mode="cut" for a full cut-away; in an external editor, drop them into the slide region of its split layout.

Not for: slides that need interactive editing (use Keynote / Figma / a slideshow tool), or full-screen landscape lecture decks (use --platform youtube --layout full only for a few cut-aways; a long deck wants its own design).

Design language

Section titled “Design language”
  • Black ground, white text, grey dims, one accent: --teal = var(--slides-accent, #2dd4bf). The scripts inject --slides-accent from persona slides.accent (default teal #2dd4bf); --accent "#hex" overrides it per run. persona.brand.accent is not used (it is the talking-head/promo accent, often 小红书 red); set slides.accent if you want slides to match it. Tints use color-mix(). Keep slides.accent equal to the cover accent (workflows/cover) so the channel reads as one design. --no-persona skips persona brand vars and slides.accent (accent = --accent or teal).
  • Fonts via @font-face on assets/fonts/ (copied from the repo font cache at render time; Noto Sans SC covers CJK).
  • Square 1080×1080 by default because the slide region of a split layout is roughly square and degrades gracefully to 4:5. Full-frame per platform: see Platforms.

Platforms

Section titled “Platforms”

Flags (both scripts): --platform NAME[:orientation] (xiaohongshu:vertical, douyin, tiktok, youtube, youtube-shorts, bilibili:horizontal; profiles from vstudio.platform), --layout split|full (default split), --size WxH (always wins).

flags canvas what changes
none / --layout split 1080×1080 (side = min of the profile canvas, so 1080 for every built-in profile) nothing: square slide, template padding 60 px
--layout full --platform P the profile canvas (小红书 vertical 1080×1440, 抖音/TikTok/Shorts 1080×1920, YouTube/B站 1920×1080) slide padding and footnote move inside platform.safe_box; the lower-right button column (keepouts) widens the right padding; the nowrap diagram sentence shrinks if the safe width is < 960 px
--layout full without --platform persona platforms.default profile as above

Content keeps its pixel sizes (designed for 1080 wide); a full-frame slide is the square design centred in the safe area, not scaled. Safe zones come from the profile (override in persona platforms.<name>).

Handing slides to a composition:

  • Vertical split (talking head + slide): render square (default), place it in the top/bottom half of the 1080×1920 / 1080×1440 composition; the composition owns the platform safe zones.
  • Full-frame vertical cut-aways: --platform douyin --layout full (or xiaohongshu:vertical) gives a PNG at the exact canvas size: drop it on the timeline full-screen, no scaling.
  • Horizontal (YouTube/B站): --platform youtube --layout full for full-screen slides, or keep the square and place it beside the speaker (left/right split).
  • Multi-platform delivery happens on the finished video: python -m vstudio.export master.mp4 --platforms ....

Gotchas (each from a real revision)

Section titled “Gotchas (each from a real revision)”
  • CSS var() does not interpolate inside @keyframes. to{width:var(--tgt)} jumps or does nothing. Write explicit from{width:0} to{width:87%} per element and use fill-mode both.
  • Add the animate class two requestAnimationFrames after load so frame 0 is the start state, not mid-animation.
  • Show slides with the .on class (display:flex), not inline display toggles; it composes with animations.
  • Sentence-in-a-diagram text: white-space:nowrap and size it to fit. A wrapped line breaks arrows/overlays.
  • Arrow diagrams are drawn by JS after layout (and after document.fonts.ready, else arrows land on pre-font word positions in some renders): give their key an _attn suffix and keep --wait ≥ 1500 ms.
  • No emojis in headings (inconsistent across renderers); OK inside chat-bubble examples.
  • Eyebrow pattern for section labels: <div class="eyebrow"><span class="dot"></span>NAME</div>.

Self-check

Section titled “Self-check”
  • Every PNG is exactly the target size; nothing overflows
  • Section headers use the giant-number pattern; eyebrows use the standard pattern
  • Keyframes use explicit from/to values, no var() inside
  • ≤3 animated slides; each covered by enough narration
  • Files named slide_NN_name.{png,mp4}