screenstudio-alt

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	critical
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"]
plugin	{"targets":{"codex":"blocked","claude":"blocked"},"setup":{"type":"manual","summary":"Screen/input capture requires sensitive local permissions; keep out of plugin-safe bundles.","docs":"SKILL.md"}}

When to Use

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).

screenstudio-alt

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 — source range locked, rate set via inspector slider on select or right-edge 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.)