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Measured on real files with quality held fixed (SSIM vs the source, harness self-tested at 1.0000): hevc_nvenc cq27 produced 115% and 119% of the source video bitrate on two of three files while cq30/31 landed 51-84%; libx265 crf26 landed 33.7/56.7/67.0% at min SSIM 0.988-0.993, i.e. 10-22% smaller than NVENC at matched quality. Two sources with identical bpp (0.0437) shrank 49% vs 17%, so bpp classifies files but does not predict the ratio. Notes the audio floor (a 33.7% video stream still yields a 53% file because AAC dominates what is left) and why VP9/AV1 sources have no headroom (copy the video).
og-gen — per-post OG image generator
Generates a branded 1200×630 social-share image for a blog post, matching the
site's cobalt-blue #295cff branding, the logo-square.png mark, and the
"terminal / debugging" visual style.
Usage
node scripts/og-gen/generate.mjs <post-slug>
Reads frontmatter (title, category, tags) from
src/content/posts/<slug>.md, fills template.html, renders with headless
Chrome, and writes public/og/<slug>.png.
The post's frontmatter needs ogImage: /og/<slug>.png so the blog serves it
(layout already renders og:image + width/height; PostList shows it as a
card thumbnail).
Customizing the terminal box
Each post shows a "terminal" panel (the red error / green fix lines). Add an
entry keyed by slug in TERMINALS inside generate.mjs, using these tokens:
<div class="line"><span class="prompt">$</span><span class="cmd">command</span></div>
<div class="line"><span class="prompt"> </span><span class="err">error line</span></div>
<div class="line"><span class="prompt">$</span><span class="cmd">fix</span><span class="fix">→ done ✓</span></div>
No entry → a generic default terminal.
Requirements
- Google Chrome at
C:\Program Files\Google\Chrome\Application\chrome.exe(override withCHROME_PATHenv var). - Node 20+.
Notes
- PNG (not JPG) is intentional: for flat UI/terminal art, PNG is smaller and sharper than JPG (see commit history).
- The
logo-square.pngreferenced lives atpublic/logo-square.png.