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February 2, 2021 14:10
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A script to synchronize a movie and a commentary with auto ducking. Uses only ffmpeg.
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| #!/bin/sh | |
| if [ $# -eq 0 ] | |
| then | |
| echo "usage: ./commentary_sync.sh movie commentary subtitle" | |
| exit | |
| fi | |
| ffmpeg -i "$1" -vn -acodec copy audio.aac | |
| ffmpeg -i audio.aac -i "$2" -filter_complex "[1:a]asplit=2[sc][mix];[0:a][sc]sidechaincompress=threshold=0.1:ratio=3[bg]; [bg][mix]amerge[final]" -map [final] final.aac | |
| ffmpeg -i "$1" -i final.aac -i "$3" -c copy -map 0:v:0 -map 1:a:0 -map 2:s:0 synchronized.mkv | |
| rm audio.aac | |
| rm final.aac |
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