Audio editing (ffmpeg)

Loudness normalize, denoise, and background-music mixing. These are plain ffmpeg one-liners — no CLI command wraps them. Every recipe stream-copies the video (-c:v copy, fast + lossless) and re-encodes only the audio to aac.

Pick the operation:

• Audio too quiet / loud / inconsistent across clips → normalize.
• Background hiss / hum / fan noise → denoise.
• Lay a music bed under narration → add music (use --duck-style sidechain so music drops under speech).
• Cutting um/uh hesitations → use the filler-removal skill, not this one.

Normalize loudness