Audio

Process, enhance, and convert audio files with noise removal, normalization, format conversion, transcription, and podcast workflows.

Security Scan

The skill is an instruction-only audio-processing guide that consistently requires ffmpeg/ffprobe and provides expected FFmpeg/Whisper workflows; nothing requested or described is disproportionate to its stated purpose.

Purpose & Capability

Name/description (audio processing, noise removal, normalization, format conversion, transcription, podcast workflows) match the declared requirements (ffmpeg, ffprobe) and the provided command examples. Optional tools (sox, whisper, demucs) are appropriate for the advanced features the skill describes.

Instruction Scope

SKILL.md and the included docs instruct the agent to run FFmpeg/SoX/Whisper commands on user-provided files, inspect files with ffprobe, and run batch scripts. This is within scope. The docs also include examples of using external APIs (AssemblyAI) and diarization tools that require tokens—these are explicit, optional, and consistent with transcription use cases, but they do introduce network interactions if the user chooses them.

Install Mechanism

Instruction-only skill with no install spec or downloaded code. That minimizes disk-write and supply-chain risk; the only runtime requirement is that the environment has the declared binaries installed.

Credentials

The skill declares no required environment variables or credentials. Optional examples mention API tokens (AssemblyAI, Hugging Face) only where those services are used. There are no unrelated secrets requested.

Persistence & Privilege

always is false and the skill contains no installation steps or actions that modify other skills or system-wide agent settings. The included batch scripts operate on files in the working directory (expected for a file-processing skill).

Assessment

This skill is a documentation-only helper for running FFmpeg/Whisper-style audio workflows and appears coherent with its purpose. Before using: (1) ensure ffmpeg and ffprobe are installed from trusted packages, (2) review any shell snippets (especially batch scripts) before running them to avoid accidental mass changes to files in the current directory, (3) be aware optional transcription/diarization examples call external APIs and require API keys — only provide those keys if you trust the service, and (4) confirm how your agent is allowed to access files/network (if the agent has broad file or network privileges, treat any automated commands cautiously). If you want a lower-risk test, run commands on a disposable/sample file or in a sandboxed environment first.

Requirements

Required:

• ffmpeg / ffprobe — core audio processing

Optional (for advanced features):

• sox — additional noise reduction
• whisper — local transcription (or use API)
• demucs — stem separation

Quick Reference

Situation	Load
FFmpeg commands by task	commands.md
Loudness standards by platform	loudness.md
Podcast production workflow	podcast.md
Transcription workflow	transcription.md

Core Capabilities

Task	Method
Convert formats	FFmpeg (-acodec)
Remove noise	FFmpeg filters or SoX
Normalize loudness	ffmpeg-normalize or -af loudnorm
Transcribe	Whisper → text, SRT, VTT
Separate stems	Demucs (vocals, drums, bass, other)

Execution Pattern

1. Clarify goal — What format? What loudness? What platform?
2. Analyze source — ffprobe for codec, sample rate, channels, duration
3. Process — FFmpeg/SoX for transformation
4. Verify — Check output plays, meets specs, sounds correct
5. Deliver — Provide file to user

Common Requests → Actions

User says	Agent does
"Convert to MP3"	-acodec libmp3lame -q:a 2
"Remove background noise"	Apply highpass/lowpass or dedicated denoiser
"Normalize for podcast"	-af loudnorm=I=-16:TP=-1.5:LRA=11
"Transcribe this"	Whisper → output SRT/VTT/TXT
"Extract audio from video"	-vn -acodec copy or re-encode
"Make it smaller"	Lower bitrate: -b:a 128k or -b:a 96k
"Speed up 1.5x"	-af atempo=1.5

Format Quick Reference

Format	Use Case	Quality
WAV	Master, editing	Lossless
FLAC	Archive, audiophile	Lossless compressed
MP3	Universal sharing	Lossy, 128-320 kbps
AAC/M4A	Apple, podcasts	Lossy, efficient
OGG/Opus	WhatsApp, Discord	Lossy, very efficient

Quality Defaults

• Podcast: -16 LUFS (Spotify), -19 LUFS (Apple)
• Music: -14 LUFS (Spotify), -16 LUFS (Apple Music)
• MP3 quality: VBR -q:a 2 (~190 kbps) or CBR -b:a 192k
• Sample rate: 44.1kHz for music, 48kHz for video sync

Scope

This skill:

• Processes audio files user explicitly provides
• Runs FFmpeg commands on user request
• Does NOT access cloud services without user knowing
• Does NOT store files persistently (user manages their files)