Vercel Composition Patterns
supabase/supabase
React composition patterns that scale. An agent skill from supabase/supabase.
The shared video path — how a video reaches the video player window (playlist routing, browser rows, drops), the VLCKit-backed VideoPlayerView and its output sizing, the window's cast routing and…
Install Video Playback
$ npx skills add ad-repo/nullplayer --skill video-playback -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install ad-repo/nullplayer video-playback --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/ad-repo/nullplayer.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/video-playback .claude/skills/video-playback && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "video-playback" agent skill from https://github.com/ad-repo/nullplayer/tree/main/skills/video-playback into .claude/skills/video-playback/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "video-playback", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/ad-repo/nullplayer/tree/main/skills/video-playbackType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add ad-repo/nullplayer --skill video-playback -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install ad-repo/nullplayer video-playback --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/ad-repo/nullplayer.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/video-playback .agents/skills/video-playback && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "video-playback" agent skill from https://github.com/ad-repo/nullplayer/tree/main/skills/video-playback into .agents/skills/video-playback/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "video-playback", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add ad-repo/nullplayer --skill video-playback -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install ad-repo/nullplayer video-playback --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/ad-repo/nullplayer.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/video-playback .cursor/skills/video-playback && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "video-playback" agent skill from https://github.com/ad-repo/nullplayer/tree/main/skills/video-playback into .cursor/skills/video-playback/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "video-playback", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/ad-repo/nullplayer.git --path skills/video-playback--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add ad-repo/nullplayer --skill video-playback -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install ad-repo/nullplayer video-playback --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/ad-repo/nullplayer.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/video-playback .gemini/skills/video-playback && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "video-playback" agent skill from https://github.com/ad-repo/nullplayer/tree/main/skills/video-playback into .gemini/skills/video-playback/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "video-playback", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install ad-repo/nullplayer video-playbackInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add ad-repo/nullplayer --skill video-playback -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/ad-repo/nullplayer.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/video-playback .github/skills/video-playback && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "video-playback" agent skill from https://github.com/ad-repo/nullplayer/tree/main/skills/video-playback into .github/skills/video-playback/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "video-playback", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add ad-repo/nullplayer --skill video-playback -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install ad-repo/nullplayer video-playback --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/ad-repo/nullplayer.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/video-playback .opencode/skills/video-playback && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "video-playback" agent skill from https://github.com/ad-repo/nullplayer/tree/main/skills/video-playback into .opencode/skills/video-playback/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "video-playback", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
video-playback- GitHub stars
- 158
- Token cost
- ~6.5k tokens
- SKILL.md length
- 3,607 words
- Files
- 1
- Skills in repo
- 40
- Repo updated
- First seen
- Licence
- Custom licence
At a glance
The shared video path — how a video reaches the video player window (playlist routing, browser rows, drops), the VLCKit-backed VideoPlayerView and its output sizing, the window's cast routing and…
- Debugging video playback
- SKILL.md covers Key files, Routing rules, Entry points and Window lifetime, plus 4 more sections
- Calls ffmpeg
- The video player window
What it does
Video Playback is an agent skill from ad-repo/nullplayer. The shared video path — how a video reaches the video player window (playlist routing, browser rows, drops), the VLCKit-backed VideoPlayerView and its output sizing, the window's cast routing and lifetime, and Plex / Jellyfin / Emby progress reporting. Use when working on or debugging video playback, the video player window, a video drawn at the wrong size or position, or anything that plays a video file or stream outside a skin's own video surface.
Its SKILL.md is about 6.5k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
It sits in Development. The repository describes itself as: nullPlayer is a free open source macOS media player with some unique features.
When your agent uses it
- Debugging video playback
- The video player window
- A video drawn at the wrong size
- Anything that plays a video file
Example prompts
- “/video-playback”
What it can do on your machine
Read from SKILL.md and the folder at commit 3d87ce1. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
Shell commands in SKILL.md call:
ffmpeg
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Video Playback loads about 6.5k tokens when it runs. Until then it costs about 118 tokens; SKILL.md has 3,607 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
SKILL.md
Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 3,607 words (~6,482 tokens).
“Video plays in its own window through VLCKit (libVLC 3.0.12.1, vendored in Frameworks/VLCKit.framework), never through the audio engine's graph. Skin-hosted video surfaces (.wal , .wmz video panes) have their own guides: winamp-modern-skin-guide (reference/components/video.md) and wmp-skin-guide (reference/rendering/video.md). Headless video casting (--movie…”
- name
- video-playback
Files
Just SKILL.md in skills/video-playback of ad-repo/nullplayer.
Open the folder on GitHubat commit 3d87ce1
Compare with similar skills
Video Playback next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Video Playback this skillad-repo/nullplayer | 158 | — | ~6.5k | Automated safety check: Pass | Custom licence | |
| Vercel Composition Patternssupabase/supabase | 111k | 58 repos | ~726 | Automated safety check: Pass | MIT | |
| Finishing a Development Branchobra/superpowers | 297k | 5 repos | ~1.9k | Automated safety check: Pass | MIT | |
| Typescript Advanced Typesrolling-scopes/rsschool-app | 10k | 25 repos | ~4.2k | Automated safety check: Pass | MPL-2.0 | |
| PR Babysitteropeninterpreter/openinterpreter | 69k | 3 repos | ~4.2k | Automated safety check: Pass | Apache-2.0 | |
| Code Review ChecklistshareAI-lab/learn-claude-code | 78k | 4 repos | ~1.1k | Automated safety check: Pass | MIT |
Similar skills
- Official
Finishing a Development Branch
obra/superpowers
Walks the last step of a branch: confirm tests pass, detect the git environment, ask how to integrate, carry out your choice and clean up the worktree.
Typescript Advanced Types
rolling-scopes/rsschool-app
Master TypeScript's advanced type system including generics, conditional types, mapped types, template literals, and utility types for building type-safe applications.
PR Babysitter
openinterpreter/openinterpreter
Watches an open GitHub pull request until it merges, handling review comments, diagnosing CI failures and retrying flaky checks along the way.
Code Review Checklist
shareAI-lab/learn-claude-code
Reviews code against a five-part checklist covering security, correctness, performance, maintainability and testing, and reports findings in a fixed format.
Greploop
onyx-dot-app/onyx
Iteratively improves a PR (GitHub), MR (GitLab), or shelved changelist (Perforce) until Greptile gives it a 5/5 confidence score with zero unresolved comments.
More from ad-repo/nullplayer
All 40 skills in this repoSkin Screenshots
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Capture one centred main-window screenshot per skin across every skin system (Classic, Original, Original-Metal, Modern/.wal, Media Player/.wmz, Audion Faces) and assemble them into a fixed-duration…
Vis Classic Guide
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Comprehensive implementation and profile reference for NullPlayer's visclassic mode (CVisClassicCore, VisClassicBridge, SpectrumAnalyzerView integration, menu/keyboard controls…
App Control
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Launch, configure, drive, screenshot and measure the running NullPlayer app.
Chromecast Casting
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Google Cast Protocol v2, message framing, debugging, and test scripts.
Emby Integration
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Emby API, authentication flow, rating scale, streaming, scrobbling, and video playback.
Live UI Testing
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How to debug a defect that only exists on screen — instrument first, drive the app yourself, and measure what is actually drawn.
Related
Categories
Questions about Video Playback
What does Video Playback do?
The shared video path — how a video reaches the video player window (playlist routing, browser rows, drops), the VLCKit-backed VideoPlayerView and its output sizing, the window's cast routing and…. Video Playback is an agent skill from ad-repo/nullplayer. The shared video path — how a video reaches the video player window (playlist routing, browser rows, drops), the VLCKit-backed VideoPlayerView and its output sizing, the window's cast routing and lifetime, and Plex / Jellyfin / Emby progress reporting.
When should I use Video Playback?
Video Playback fits situations like: debugging video playback; the video player window; A video drawn at the wrong size; anything that plays a video file.
How do I install Video Playback in Claude Code?
Run `npx skills add ad-repo/nullplayer --skill video-playback -a claude-code`. Or copy the skill folder (skills/video-playback in ad-repo/nullplayer) into .claude/skills/video-playback in your project. Claude Code loads it when a task matches its description.
How do I install Video Playback in Codex?
Run `npx skills add ad-repo/nullplayer --skill video-playback -a codex`. Or copy the skill folder (skills/video-playback in ad-repo/nullplayer) into .agents/skills/video-playback in your project. Codex loads it when a task matches its description.
Can I use Video Playback in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add ad-repo/nullplayer --skill video-playback -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/video-playback, .gemini/skills/video-playback, .github/skills/video-playback and .opencode/skills/video-playback in your project.
What does Video Playback need to run?
Going by SKILL.md and its folder, Video Playback needs the command-line tools its instructions call (ffmpeg).
Does Video Playback access the network?
SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.
Is Video Playback safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does Video Playback use?
Video Playback has a licence file (the repository's licence) that doesn't match a standard licence. Read it on GitHub before reusing the skill.
How many tokens does Video Playback use?
About 6.5k tokens (SKILL.md is roughly 26k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
What are the alternatives to Video Playback?
Skills that share tags, products or a category with Video Playback: Vercel Composition Patterns (supabase/supabase, 111k stars), Finishing a Development Branch (obra/superpowers, 297k stars), Typescript Advanced Types (rolling-scopes/rsschool-app, 10k stars) and PR Babysitter (openinterpreter/openinterpreter, 69k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Video Playback?
ad-repo (a GitHub user) maintains it in ad-repo/nullplayer, which has 158 GitHub stars. The repository holds 40 skills in this directory. The repository was last updated on October 10, 2026.
Source: ad-repo/nullplayer on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.