53 lines
1.8 KiB
Bash
53 lines
1.8 KiB
Bash
#!/usr/bin/env bash
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# Use this to get a volume report from a video or audio file. You can use this
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# info manually normalize or increase/decrease the volume using the
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# change-volume script, supplying it the volume delta you want. Typically you
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# use the delta from the analysis report this script provides, e.g. if the
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# max_volume is -5 db then you would call change-volume with a value of 5. I
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# find that the two pass normalize-volume script works better than this
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# approach...but it will take longer to run!
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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}${RED}Usage: analyze-volume <video or audio filename>${NORMAL}\n"
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exit 1
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fi
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filename="$1"
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printf "\n${YELLOW}${BOLD}Analyzing audio in $filename${NORMAL}\n"
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# -vn, -sn, and -dn tells ffmpeg to ignore non-audio streams during the analysis. This speeds things up.
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cmd="ffmpeg -i \"$filename\" -af volumedetect -vn -sn -dn -f null /dev/null"
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printf "\n${BOLD}Running: $cmd\n\n${NORMAL}"
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eval $cmd
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printf "\n${GREEN}${BOLD}Done analyzing audio in $filename\n${NORMAL}"
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printf "\n${YELLOW}${BOLD}Look at the reported max_volume value. If != 0 then call the change-volume script, passing it the filename, an output name and the delta to bring the volume to 0.\ne.g. if the max_volume is -5 db, then you would pass 5.${NORMAL}\n\n"
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