Audio Mastering CLI

CLI audio mastering without a reference track using ffmpeg; accepts audio or video inputs and outputs mastered WAV/MP3 or remuxed MP4.

Security Scan

The skill's stated purpose (ffmpeg-based mastering) and required binaries match, but the runtime instructions call a PowerShell script (scripts/master_media.ps1) that is not included and there is no install step to fetch it—this inconsistency is risky and needs clarification before use.

Purpose & Capability

The name/description (CLI audio mastering) align with the declared requirements (ffmpeg and powershell). However, the SKILL.md explicitly runs a local script at {baseDir}/scripts/master_media.ps1. That script is not present in the package and there is no install spec to obtain it, so the skill cannot perform its claimed function as-is and would require fetching/executing external code.

Instruction Scope

Instructions are narrowly scoped to running a local PowerShell script which in turn is expected to call ffmpeg; there are no declared steps that exfiltrate data or read unrelated system credentials. However the recommended command uses -ExecutionPolicy Bypass and runs an external script file — running PowerShell scripts obtained from outside should be audited because they can perform arbitrary I/O, network activity, or spawn other processes.

Install Mechanism

There is no install spec (instruction-only), which is low-risk in itself. But README and SKILL.md imply a repository with a scripts/ directory; the packaged files do not include the referenced script. The missing script means an operator would need to clone/download code from the referenced GitHub URL (or another source) before use — that download step is not specified or verified in the package and is a potential supply-chain risk.

Credentials

The skill requests no environment variables or credentials and only needs ffmpeg and powershell, which are appropriate for a Windows ffmpeg wrapper. There are no unrelated secrets or config paths requested.

Persistence & Privilege

The skill does not request persistent presence (always:false) and uses default autonomous invocation. It does not attempt to modify other skills or system-wide settings in the provided instructions.

What to consider before installing

Do not run the provided PowerShell command until you have the actual script and have inspected it. The SKILL.md expects a file scripts/master_media.ps1 that is not included in this package; acquiring that script from an external repo (or running it directly) could execute arbitrary commands. Steps to take before installing or running: 1) Obtain the referenced GitHub repo URL from the metadata and clone it yourself; 2) Inspect scripts/master_media.ps1 for any network calls, file operations, or calls to other binaries; 3) Verify that any ffmpeg commands in the script do only local re-encoding/remuxing and do not upload data; 4) Avoid running PowerShell with -ExecutionPolicy Bypass on untrusted scripts — run in a sandboxed VM or isolated environment if possible; 5) Prefer to fetch the code from the official repo and confirm its integrity (commit hash, maintainer) rather than running a missing script from an unspecified source. If the author can provide the missing script in the package or a clear install step that fetches a signed/verified release, re-evaluate; otherwise treat this package as incomplete and potentially risky.

Usa este skill cuando el usuario quiera masterizar audio sin referencia, por CLI, sobre archivo de audio o video.

Entradas soportadas

• Audio: wav, aiff, flac, mp3, m4a
• Video: mp4, mov, m4v, mkv, webm

Flujo

1. Verifica que existe el archivo de entrada.
2. Ejecuta: powershell -ExecutionPolicy Bypass -File "{baseDir}/scripts/master_media.ps1" -InputFile "<ruta-archivo>" -MakeMp3
3. Entrega salidas:
   • WAV master: <base>_master.wav
   • MP3 master: <base>_master.mp3 (si -MakeMp3)
   • Si la entrada es video: <base>_master.mp4 con video original + audio masterizado AAC 320k
4. Reporta loudness/true peak del log.

Cadena aplicada

• highpass + lowpass
• EQ suave de correccion/mejora
• acompressor
• alimiter
• loudnorm dos pasadas (objetivo conservador multiplaforma)

Verificacion opcional

ffmpeg -hide_banner -i "<archivo_master.wav>" -af "loudnorm=I=-14:TP=-1:LRA=7:print_format=summary" -f null NUL

Notas

• Para video: se conserva el stream de video (-c:v copy) y solo se reemplaza audio.
• Si hay avisos de clipping interno en EQ, bajar input o ganancias de EQ y reexportar.