2.0 KiB
2.0 KiB
Audio
Clean Audio = Believable Video
Viewers forgive shaky images far sooner than noisy sound.
Note: Start by playing two identical clips—one with background hiss, one cleaned—and ask which looks “more professional.”
--
Audio
1. Capture at the Source
- Use the best mic available; position 15–30 cm from mouth.
- Monitor with headphones; peaks should stay below –6 dB.
- Record at least 10 s room‑tone in every location.
Note: Emphasise that good capture saves hours in post; show how red‑lined peaks distort irreversibly.
--
Audio
2. Room‑Tone & Noise Control (Audacity)
- Import clip.
- Select clean room‑tone → Effect ▸ Noise Reduction ▸ Get Profile.
- Select entire track → repeat Noise Reduction (6–12 dB reduction, Sensitivity 6, Frequency Smoothing 3).
- Apply High‑Pass Filter 80 Hz to remove rumble.
Note: Warn that over‑reduction causes “swirly” artefacts—dial Sensitivity down if it sounds robotic.
--
Audio
3. Equalize & Compress
- Roll off <80 Hz; dip 4 kHz to tame harshness.
- Compressor: Threshold ‑6 dB, Ratio 3:1, Attack 10 ms, Release 150 ms.
- Limit peaks to ‑1 dB; aim for dialogue ≈‑12 LUFS.
Note: Show LUFS meter in Kdenlive (View ▸ Audio Meter) and explain web loudness target (‑14 LUFS) versus broadcast (‑23 LUFS).
--
Audio
4. Sync & Layering
- Align tracks via the hand‑clap spike in waveforms.
- Keep voice‑off on dedicated top audio track; ambience/FX below.
- Add 3‑frame fades at every cut to kill pops.
Note: Demo Kdenlive’s Align Audio to Reference for quick waveform sync—the same tool used in multicam earlier.
--
Audio
5. Export Best Quality
- Export WAV 48 kHz 24‑bit from Audacity.
- In Kdenlive Render: AAC 48 kHz, 192 kb/s (YouTube preset is fine).
- Watch meters during render; ensure no clipping.
Note: Clarify that archive masters stay lossless; delivery formats can be lossy.