69 lines
2 KiB
Bash
69 lines
2 KiB
Bash
#!/bin/bash
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# set shopt-options used by this shell-script
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# Note, 0 (true) from shopt -q is "false" in a math context.
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shopt -q globstar; globstar_set=$?
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((globstar_set)) && shopt -s globstar
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shopt -q extglob; extglob_set=$?
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((extglob_set)) && shopt -s extglob
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# return default shopt-options
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function finish {
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((globstar_set)) && shopt -u globstar
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((extglob_set)) && shopt -u extglob
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}
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trap finish EXIT
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extension=''
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while getopts 'e:' flag; do
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case "${flag}" in
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e) extension+=("$OPTARG");;
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*) exit 1 ;;
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esac
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done
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# write array into string
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extension="${extension[*]}"
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# remove leading space
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extension="${extension##+([[:space:]])}"
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# change separator
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extension=${extension// /|}
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for file in **/*.@($extension); do
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#set a channel-dependent bitrate for every audio stream
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command=$(
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ffprobe "$file" -v 0 -show_entries stream=channels,bit_rate -select_streams a -of compact=p=0:nk=1:s="\ " |
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awk -v file="$file" -v file_output="${file%.*}.opus" '
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BEGIN{
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ORS=" ";
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print "ffmpeg -i \""file"\" -map 0:a -c:a libopus"
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}
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{ # https://wiki.xiph.org/Opus_Recommended_Settings
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if($1==1) print $2>=64000 ? "-b:a:"NR-1" 64k" : "-b:a:"NR-1" "$2
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else if($1==2) print $2>=128000 ? "-b:a:"NR-1" 128k" : "-b:a:"NR-1" "$2
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else if($1<=6) print $2>=256000 ? "-b:a:"NR-1" 256k" : "-b:a:"NR-1" "$2
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else print $2>=450000 ? "-b:a:"NR-1" 450k" : "-b:a:"NR-1" "$2
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}
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END{
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print "\""file_output"\" -v info -hide_banner"
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}')
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is_video=$(ffprobe -i Hair.m4v -v fatal -select_streams V -show_entries stream=codec_type)
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if [[ -n "$is_video" ]]; then
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echo "$file is a video file and will not be converted"
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#an Example for converting the audiostreams in a container while copying subtitles and videostreams.
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#ffmpeg -i Hair.m4v -map 0:a -map 0:s -map 0:v -c:a libopus -c:v copy -c:s copy Hair.mkv -hide_banner -v info
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#for extracting the audiostreams of a video file just use "eval "$command"".
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#it is recommended to check the result before deleting the original file.
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else
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eval "$command" #&& rm "$file"
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fi
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done
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exit 0
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