60 lines
1.7 KiB
Bash
60 lines
1.7 KiB
Bash
#!/usr/bin/env bash
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# Re-encodes the audio, modify the volume based on the supplied db delta. If
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# given a video file then the file is copied as-is. If you want to bring the
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# max_volume to 0 db then call analyze-volume prior to this and pass a delta
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# based on the reported max_volume.
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#
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# Inspired by https://superuser.com/a/323127 and https://superuser.com/a/1312885
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if which tput >/dev/null 2>&1; then
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ncolors=$(tput colors)
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fi
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if [ -t 1 ] && [ -n "$ncolors" ] && [ "$ncolors" -ge 8 ]; then
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RED="$(tput setaf 1)"
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GREEN="$(tput setaf 2)"
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YELLOW="$(tput setaf 3)"
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BLUE="$(tput setaf 4)"
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MAGENTA="$(tput setaf 5)"
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CYAN="$(tput setaf 6)"
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BOLD="$(tput bold)"
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NORMAL="$(tput sgr0)"
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else
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RED=""
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GREEN=""
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YELLOW=""
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BLUE=""
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MAGENTA=""
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CYAN=""
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BOLD=""
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NORMAL=""
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fi
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if [[ $1 == "" ]]; then
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printf "${BOLD}${RED}Usage: change-volume <video or audio filename> <output name> <volume delta in db>${NORMAL}\n"
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exit 1
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fi
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filename=$(basename -- "$1")
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extension="${filename##*.}"
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filename="${filename%.*}"
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output_name="$2"
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delta_db="$3"
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if [[ $output_name == "" ]]; then
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output="${filename}_normalized_audio.$extension"
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else
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output="${output_name}.$extension"
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fi
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printf "\n${YELLOW}${BOLD}Modifying audio volume in $filename.$extension | output: $output | delta: $delta_db${NORMAL}\n"
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# Since we're re-encoding the audio we have to specify a codec to use.
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cmd="ffmpeg -y -stats -loglevel level+error -i \"$filename.$extension\" -af \"volume=${delta_db}dB\" -c:v copy -c:a aac \"$output\""
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printf "\n${BOLD}Running: $cmd\n\n${NORMAL}"
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eval $cmd
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printf "\n${GREEN}${BOLD}Done modifying volume in $filename.$extension | output: $output | delta: $delta_db${NORMAL}\n"
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