vivy-yi/xiaohongshu-skills/audio-processing

Audio Processing (音频处理)

Overview

Audio processing encompasses recording, editing, enhancing, and optimizing audio content for Xiaohongshu posts, ensuring professional sound quality that significantly enhances content professionalism, viewer retention, and overall production value. Poor audio is the #1 reason viewers abandon content within seconds - even with stunning visuals, bad audio makes content unwatchable. This skill covers the complete audio production workflow: from recording setup through editing, noise reduction, mixing, and final optimization for Xiaohongshu's platform specifications.

Key insight: Viewers will forgive mediocre video quality, but they will not tolerate poor audio. Investing in audio processing yields 50%+ improvements in viewer retention and 3-5x increases in engagement rates. Professional audio transforms amateur content into credible, trustworthy content.

When to Use

Use when:

• Recording voiceovers for Xiaohongshu videos, tutorials, or storytelling content
• Editing podcast-style audio content or interview recordings
• Improving audio quality in existing recordings (noise reduction, volume leveling)
• Creating background music tracks or adding sound effects to videos
• Producing audio-first content formats (podcasts, audio diaries, voice notes)
• Fixing common audio issues: background noise, echo, distortion, low volume
• Optimizing audio for Xiaohongshu's platform specifications and compression
• Creating consistent audio quality across content series
• Adding professional polish with music beds, transitions, and sound design

Do NOT use when:

• Using licensed music without proper permissions (copyright violation)
• Content requires pure ambient sound (over-processing disrupts authenticity)
• Audio is already professional quality (over-processing can degrade quality)
• Quick, casual content where production speed matters more than polish
• Live streaming (different audio setup requirements)

Core Pattern

Before (poor audio quality): ❌ "Background noise, room echo, distractions" ❌ "Inconsistent volume, too quiet then too loud" ❌ "Viewer adjusts volume constantly, gives up" ❌ "Content seems amateur, low credibility" ❌ "Viewers scroll away within 3 seconds"

After (professional audio): ✅ "Clean, clear voice recording" ✅ "Consistent volume levels throughout" ✅ "Pleasant listening experience, no adjustments needed" ✅ "Content feels professional, trustworthy" ✅ "Viewers watch complete content, high engagement"

6 Essential Audio Processing Elements:

Quick Reference

Audio Processing Software Comparison:

Xiaohongshu Audio Specifications:

• Format: AAC, MP3, or M4A
• Sample Rate: 44.1kHz or 48kHz
• Bitrate: 128-320 kbps (192 kbps recommended for balance)
• Channels: Stereo or Mono (Mono for voice-only is fine)
• Loudness Target: -16 LUFS (YouTube/Broadcast standard)

Quick Audio Fixes (by symptom):

Implementation

Step 1: Recording Setup and Environment

Prevention is better than correction - capturing clean audio at source saves hours of editing and yields better results than any post-processing.

Microphone Selection:

Environment Setup:

• Quietest room available: Close windows, turn off fans/AC, avoid high-traffic times
• Reduce reflections: Hang blankets, use acoustic foam, record in closet full of clothes
• Distance to mic: 6-12 inches (15-30cm) for optimal balance of proximity effect and room noise
• Pop filter: Essential for plosive sounds (P, B sounds) - cheap foam or metal mesh
• Shock mount: Isolates mic from desk vibrations and handling noise

Recording Levels:

• Target: -12dB to -6dB average, peaks around -3dB
• Too low: -24dB or below → brings up noise floor when boosted later
• Too hot: Peaking at 0dB → distortion/clipping, cannot be fixed
• Test record: Always do 10-second test, check levels before full recording

Recording Checklist:

• [ ] Room is quiet (no traffic, appliances, people)
• [ ] Mic positioned 6-12 inches from mouth
• [ ] Pop filter attached
• [ ] Recording level peaks around -6dB
• [ ] Headphones monitoring live audio
• [ ] Test recording sounds clear, no issues

Step 2: Basic Audio Editing

Importing and Organizing:

• Multi-track setup: Keep voice on track 1, music on track 2, effects on track 3
• Label tracks: "Voiceover", "Background Music", "Sound Effects" for clarity
• Save project file: Always save editable project format (.aup3, .sesx, etc.) before exporting

Trimming and Arranging:

• Remove mistakes: Cut out coughs, false starts, long pauses
• Tighten pacing: Reduce pauses between sections to 0.5-1 second for better flow
• Crossfade edits: Use 5-10ms crossfades on all cuts to avoid clicks/pops
• Arrange content: Drag clips to reorder, build narrative flow

Basic Editing Techniques:

Edit Best Practices:

• Always backup original: Keep raw recording untouched, work on copy
• Non-destructive editing: Use software that preserves original (Audacity, Adobe Audition)
• Undo is your friend: Ctrl+Z / Cmd+Z liberally while learning
• Save versions: Save project after major edits (v1, v2, v3) so you can backtrack

Step 3: Noise Reduction and Cleanup

Identify Noise Types:

Noise Reduction Workflow (using Audacity as example):

Step 1: Capture Noise Profile

1. Find a section of pure noise (no voice) - usually 0.5-2 seconds at start/end
2. Select only the noise section
3. Effect → Noise Reduction → Get Noise Profile
4. Software analyzes the noise character

Step 2: Apply Noise Reduction

1. Select entire audio track (Ctrl+A / Cmd+A)
2. Effect → Noise Reduction
3. Adjust settings:

• Noise reduction (dB): Start with 12dB, adjust to taste
• Sensitivity: 3-6 (higher = more aggressive, may artifact)
• Frequency smoothing: 3-6 bands

1. Preview, adjust, then apply

Step 3: Fine-Tune

• Too aggressive: Audio sounds underwater, robotic
• Too light: Still hear noise
• Artifact check: Listen for "watery" artifacts on "S" and "F" sounds
• Apply multiple light passes better than one heavy pass

Alternative Noise Reduction Methods:

• High-pass filter: Removes low-frequency rumble below 80-100Hz
• Low-pass filter: Removes high-frequency hiss above 12-15kHz
• Notch filter: Removes specific frequency (like 60Hz electrical hum)
• Gate: Silences audio below threshold (good for background noise between words)

Step 4: Volume Normalization and Compression

Consistent volume is critical - viewers should never have to adjust their volume.

Leveling Techniques (in order of application):

1. Normalization (simple, fixes overall level):

• Purpose: Bring entire track to target peak level
• Settings: Normalize to -3dB peak (leaves headroom, prevents clipping)
• When: First step after noise reduction
• How: Select all, Effect → Normalize → Target peak level

2. Compression (evens out dynamics):

• Purpose: Reduce difference between loudest and softest parts
• Key settings:
• Ratio: 2:1 to 4:1 for voice (2:1 = subtle, 4:1 = more aggressive)
• Threshold: -20dB to -12dB (lower = more compression)
• Attack: 5-10ms (fast enough to catch peaks)
• Release: 100-300ms (natural release)
• Result: Whisper-quiet parts become audible, loud parts tamed

3. Limiting (prevents clipping):

• Purpose: Hard ceiling at -0.1dB or -1dB, ensures no digital distortion
• Settings: Threshold -1dB, ceiling -0.1dB
• When: Final step before export
• Result: No peaks exceed target, consistent loudness

Compression Quick Settings by Use Case: