Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add skills/coroboros/agent-skills/video-loopnpx skills add coroboros/agent-skills --skill video-loopgit clone --depth 1 https://github.com/coroboros/agent-skillsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/coroboros/agent-skills/video-loop)<a href="https://agentmods.dev/skills/coroboros/agent-skills/video-loop"><img src="https://agentmods.dev/badge/skills/coroboros/agent-skills/video-loop.svg" alt="Measured on agentmods" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00091 | $0.01548 |
| Opus 5 | $0.00046 | $0.00774 |
| Sonnet 5 | $0.00018 | $0.00310 |
| Haiku 4.5 | $0.00009 | $0.00155 |
Grade B, and why
video-loop scanned grade B with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 5d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Asks for rootmediumPrivilege escalation
A mod that escalates privileges can change anything on the machine, not only the project.
Confirm `ffmpeg` and `ffprobe` are available: `command -v ffmpeg ffprobe`. If either is missing, stop and ask the user to install (macOS: `! brew install ffmpeg`, Debian/Ubuntu: `! sudo apt install ffmpeg`). Never auto-i How it starts
The opening of the file, as written. The whole thing — 106 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Video Loop
Create a seamless looping background video from any source clip. A crossfade blends the last and first frames so the <video loop> transition is invisible, then the pipeline encodes web-optimized MP4 + WebM.
All ffmpeg work happens in scripts/video-loop.sh — this skill validates inputs, optionally helps pick a good fade duration, invokes the script, and turns the script's summary into a human-readable report.
Parameters
| Flag | Default | Description |
|---|---|---|
-d <seconds> |
1.5 |
Crossfade duration in seconds |
-q <crf> |
26 |
H.264 CRF — 18 = high quality, 28 = smaller file |
-w <crf> |
32 |
VP9 WebM CRF |
-o <dir> |
Same as input | Output directory |
-p |
off | Also extract a poster frame (first frame as JPEG) |
-C |
off | Disable the crossfade — optimize and encode only (-n accepted as a deprecated alias) |
No
-s/-Ssave-mode flag. Unlike media-cluster siblings (/audio-loop,/markitdown), video-loop outputs are web assets (MP4 / WebM / poster) the user drops directly into their site's video directory. No downstream skill consumes video files via-f, so the~/.agents/output/<skill>/<project>/convention would add ceremony without enabling anything —-o <dir>is the direct path.
Workflow
1. Validate tools
Confirm ffmpeg and ffprobe are available: command -v ffmpeg ffprobe. If either is missing, stop and ask the user to install (macOS: ! brew install ffmpeg, Debian/Ubuntu: ! sudo apt install ffmpeg). Never auto-install.
2. Analyze loop quality (optional but recommended)
Before committing to a crossfade, extract the first and last frames and compare them — this is the one step in the pipeline that genuinely benefits from the model's visual reasoning:
ffmpeg -y -ss 0 -i <input> -frames:v 1 -update 1 /tmp/vl-first.png
ffmpeg -y -sseof -0.1 -i <input> -frames:v 1 -update 1 /tmp/vl-last.png
Read both frames. If they're nearly identical, suggest -C (the source already loops cleanly, crossfade would only blur motion). If they differ significantly, proceed with the default fade or recommend a longer -d for more gradual blending.
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 5d ago First seen · 106 lines · 91 tokens per session scan B 75941942c3ab
video-loop is a skill published in the GitHub repository coroboros/agent-skills (4 stars, last pushed 3d ago), licensed MIT. It adds 91 tokens to every session and 1,548 once invoked, about $0.0005 per session on Opus 5. A static security scan graded it B with 1 finding (asks for root). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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