video-post-production

# Video Post-Production Guide Rules and FFmpeg patterns for finishing videos: audio mastering, captions, color, and platform-specific export. ## Audio Rules ### Volume Levels (dB) | Track | Level | Notes | |-------|-------|-------| | Voiceover | -12 to -10 dB | Primary audio, clear and upfront | | Music (under VO) | -32 to -24 dB | Background, should not compete | | Music (solo, no VO) | -16 to -12 dB | Can be louder when alone | | Sound effects | -18 to -14 dB | Accent, not distraction | | Silence floor | -60 dB | True silence feels unnatural, keep room tone | ### Music Selection by BPM | Mood | BPM Range | Use Case | |------|-----------|----------| | Calm, reflective | 60-80 | Luxury brands, testimonials | | Confident, steady | 80-100 | Corporate, explainers | | Moderate energy | 100-120 | Product demos, features | | Energetic | 120-140 | Launch videos, social ads | | High energy | 140+ | Montage, fast-cut sequences | **Rule:** Match music tempo to edit pace. Cut on beats for professional feel. ### Audio Mastering Chain (FFmpeg) ```bash # Full mastering chain: highpass + EQ + compression + loudness ffmpeg -i input.mp4 -af " highpass=f=80, equalizer=f=3000:t=q:w=1.5:g=3, acompressor=threshold=-20dB:ratio=4:attack=5:release=50, loudnorm=I=-16:TP=-1.5:LRA=11 " -c:v copy output.mp4 ``` ### Free Music/SFX Libraries - **Mixkit** (mixkit.co) - royalty-free, no attribution - **Pixabay Audio** (pixabay.com/music) - free, Pixabay license - **Freesound** (freesound....