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Open-source headless Screen Studio alternative: auto speed-up of idle, auto-zoom on click clusters, keystroke overlay chips, smoothed synthetic cursor, and 9:16 vertical export that follows the action — post-production for screen recordings from the CLI.
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Frontend design entry point: direction, design system, visual philosophy. Use whenever building or touching the look of any web UI (components, pages, dashboards, React/Vue/HTML-CSS) or when the user says "make this look better", "fix the spacing/layout", or mentions styling, color, type, or polish.
Render the UI and prove it's balanced + usable: a deterministic layout audit (centroid / optical-center / pixel-oracle balance via explicit math + annotated screenshot) plus a vision-judged Nielsen usability audit by a separate fresh-eyes judge. The measurement layer taste-only design skills lack.
Automated visual tuning: a vision or video model rates rendered variants in a loop. Render several labeled variants into one artifact, ask the model to rate them and suggest better values, render the suggestions, ask it to pick the best, repeat until good — the model is the eye, you run the loop.
Human-in-the-loop web studio to tune AI-generated output by eye. Stand up a local interactive studio (sliders, pickers, drag handles) or an inline edit/highlight/comment annotation studio for prose & media, instead of guessing values or shipping a static comparison grid.
macOS screen recorder that captures the main display PLUS system audio via ScreenCaptureKit — no BlackHole/loopback driver, no sudo, just the standard Screen Recording permission. CLI-driven; fills the headless-screen-recording-with-system-sound gap QuickTime and `screencapture -v` can't.
| name | screenstudio-alt |
| description | Open-source headless Screen Studio alternative: auto speed-up of idle, auto-zoom on click clusters, keystroke overlay chips, smoothed synthetic cursor, and 9:16 vertical export that follows the action — post-production for screen recordings from the CLI. |
| risk | safe |
| source | community |
| source_type | community |
| source_repo | connerkward/screenstudio-alternative-skill |
| date_added | 2026-06-16 |
| author | Conner K Ward |
| license | MIT |
| tags | ["screen-recording","video","post-production","auto-zoom","vertical-video","ffmpeg"] |
| tools | ["claude-code","antigravity","cursor","gemini-cli","codex-cli"] |
Use when polishing a screen recording / demo video for sharing, when the user mentions Screen Studio, auto-zoom, idle speed-up, or vertical/social video from a screen capture, and for any social-facing demo (vertical output is the default for those).
Source: connerkward/screenstudio-alternative-skill (MIT).
The skill's code lives in this directory (polish.py, render.py, studio.py,
events-log.swift, test fixtures, etc.). Published publicly as
connerkward/screen-studio-alternative via the publish-skill skill.
Two components:
events-log (Swift) — capture-side input logger (cursor 60Hz, clicks, keys;
drops keys during macOS secure input). Runs ONLY while recording. Needs
Accessibility/Input Monitoring for the terminal. Auto-zoom/keys/cursor need
this data at capture time — it cannot be recovered from pixels later.polish.py (Python, ffmpeg + PIL) — the post-production pass:python3 src/polish.py in.mp4 --events in.events.jsonl \
--speedup # compress idle (input-gap ∩ frozen-pixels; animations stay 1x)
--zoom # eased auto-zoom on click clusters (zoompan)
--keys # accumulating keystroke chips (PIL overlays, no drawtext dep)
--smooth-cursor # synthetic eased cursor (best with sck-record --no-cursor)
--vertical # ALSO emit 1080x1920 following the action
--speedup works WITHOUT events (freezedetect only) — usable on the whole
existing dailies corpus.
render.py — high-quality non-destructive renderer (preferred): single-pass
spring-physics camera over the original high-res frames, LANCZOS into a smaller
target (crisp zoom, ~1.3× sharper than the ffmpeg upscale path), 60fps, H + 9:16 V.
Tunable --freq/--zeta (spring), --fps, --target-w. Takes explicit
--regions [{t0,t1,z,cx,cy}]. polish.py is the older ffmpeg-filter fallback.studio.py [recording.mp4] — local web UI, NLE-style fixed-ruler timeline (bar =
source duration, never rescales → upstream always planted): zoom regions are draggable
blocks (move / retime edges / click to add / double-click delete); idle spans are
speed blocks with rate-only editing — source range locked, rate set via inspector
slider on select or right-edge rate-stretch drag (FCP retime / Premiere Rate
Stretch); rate changes ripple downstream only. Tunable cosine-ease ramp, default zoom,
aspect, frame styling. Always-smooth synthetic cursor + click ripple + real recorded
click sound (CC0 #735771). Export uses render.py. Free port, local. (Keystroke overlay
exists in the engine but is off by default.)screencast.sh --demo (screencast skill) does the whole chain: starts the event
logger, records, then polishes + emits the 9:16 vertical automatically. Vertical
is the DEFAULT for social-facing demos.
scale=eval=frame → crop (link reinit wedges crop's
per-frame exprs). That's why zoom uses zoompan (no t var there — use on/FPS).drawtext; all text/cursor overlays are PIL-rendered
PNGs + overlay.make-fixture.py synthesizes a fake screen recording + ground-truth
events.jsonl — validate any change against it before trusting real footage.