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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.
Passed 22 of 22 test cases with the skill, and 14 of 22 without it.
and 7 more in the full report
8 fixed14 passed either way0 still failing0 broke
Tokens, turns and time describe resource use, not a dollar price.
One of 8 test cases the skill fixed. Same model, same prompt, with and without the skill.
I want to review and manually tweak the auto-zoom regions and idle section speeds using the local browser-based editing interface for `walkthrough.mp4`. What command should I type in my terminal to spin up the web timeline UI?
| Checked | Without skill | With skill |
|---|---|---|
| Invokes studio.py | Missed | Passed |
| Passes walkthrough.mp4 as the positional target file argument | Passed | Passed |
The instructions your model reads when the skill loads.
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 aretest cases passed, vs 14 / 22 without
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