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ayosec/change-volume-ffmpeg.sh

Created January 1, 2021 17:27
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change-volume-ffmpeg.sh
#!/bin/bash
ffmpeg -ss 4:00:00 -i INPUT.webm -filter:a volume=0.5 half-volume.webm
ffmpeg -i INPUT.webm -t 4:00:00 -c copy start.webm
cat > files <<EOF
file 'start.webm'
file 'half-volume.webm'
EOF
ffmpeg -f concat -i files -c copy INPUT--half-volume-after-4H.webm
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