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 skills add Mikefluff/skills --skill audio-mix-makergit clone --depth 1 https://github.com/Mikefluff/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/mikefluff/skills/audio-mix-maker)<a href="https://agentmods.dev/skills/mikefluff/skills/audio-mix-maker"><img src="https://agentmods.dev/badge/skills/mikefluff/skills/audio-mix-maker.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 5.1 | $0.00086 | $0.01595 |
| Opus 5 | $0.00043 | $0.00797 |
| Sonnet 5 | $0.00017 | $0.00319 |
| Haiku 4.5 | $0.00009 | $0.00160 |
Grade A, and why
audio-mix-maker scanned grade A with 0 findings 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 7d 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.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 142 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Distinct from reel-builder:
- reel-builder ORCHESTRATES generation + stitching from scratch (script → shots → music → stitch). This skill is JUST the final-mix step on assets you already have.
- No script / no video / music generation — bring your own.
Distinct from subtitle-burner:
- subtitle-burner adds CAPTIONS. This skill adds AUDIO MIX.
- Both are pure-ffmpeg utilities — they share the lightweight wrapper pattern.
Distinct from voiceover-maker:
- voiceover-maker GENERATES TTS. This skill MIXES audio onto video.
This skill does NOT:
- Generate music (use
music-prompt --executefirst) - Generate voiceover (use
voiceover-maker --executefirst) - Stitch multiple video clips (use
reel-builderfor that, or raw ffmpegconcat) - Cut / trim video segments (use ffmpeg / DaVinci Resolve / Premiere)
- Sync audio to specific moments (use a NLE — Final Cut / Premiere / DaVinci)
ROLE
Read video + music + mode + volume/fade controls → run ffmpeg with the right filter chain → save mixed MP4.
PIPELINE
-
Resolve inputs:
--video <path>— source MP4 / MOV / WebM (required)--audio <path>— music / SFX / voiceover (required)
-
Pick mode:
--mode replace(default) — drop the video's original audio, use music as sole track--mode overlay— mix music ON TOP of original audio (both audible at constant volume)--mode duck— overlay with sidechain compression (music auto-lowers when speech detected)
-
Volume + fade controls:
--volume <multiplier>— 0.0-2.0 music volume (default 0.8)--fade-in <seconds>— fade in duration (default 0)--fade-out <seconds>— fade out duration (default 0.5)--duck-amount <0-1>— duck mode only: how much music attenuates (default 0.6)
-
Detect ffmpeg — print install instructions if missing.
What ships with it
4 files 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.
- 7d ago First seen · 142 lines · 86 tokens per session scan A add8be440f3c
audio-mix-maker is a skill published in the GitHub repository Mikefluff/skills (19 stars, last pushed 1mo ago), licensed MIT. It adds 86 tokens to every session and 1,595 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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