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