claude-video-audio — Audio Processing

Pre-Flight

1. Run bash scripts/preflight.sh "$INPUT" "$OUTPUT"
2. Analyze audio streams: ffprobe -v error -select_streams a -show_entries stream=codec_name,channels,sample_rate,bit_rate -of json "$INPUT"

Loudness Normalization (EBU R128)

Two-pass workflow for accurate normalization:

# Pass 1: Measure current loudness
ffmpeg -i "$INPUT" -af loudnorm=I=-14:TP=-1.5:LRA=11:print_format=json -f null - 2>&1 | tail -12

Extract measured_I, measured_TP, measured_LRA, measured_thresh, offset from the JSON output.