Audio音频处理

Requirements

Required:

• - ffmpeg / ffprobe — core audio processing

Optional (for advanced features):

• - sox — additional noise reduction
• INLINECODE3 — local transcription (or use API)
• INLINECODE4 — stem separation

Quick Reference

Situation	Load
FFmpeg commands by task	INLINECODE5
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. 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"	INLINECODE13
"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 INLINECODE20
• 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)