Leaced
999caf1c12
Now with support for multiple audio stream, separate automatic bit-rate for every stream and detection if file is a video. Videos will not be deleted and only the audio will be converted into an audio file
57 lines
1.5 KiB
Bash
57 lines
1.5 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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# setting default extension to mp3
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if [ $# -eq 0 ]; then
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extension="mp3"
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else
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extension=$@
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extension=${extension// /|}
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fi
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for file in **/*.@($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 -threads 4 -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" 128k" : "-b:a:"NR-1" "$2
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else if($1==2) print $2>=500000 ? "-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" 128k" : "-b:a:"NR-1" "$2
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else print $2>=450000 ? "-b:a:"NR-1" 128k" : "-b:a:"NR-1" "$2
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}
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END{
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print "\""file_output"\" -v 32 -hide_banner"
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}')
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is_video=$(ffprobe "$file" -v 0 -show_entries stream=codec_type -of compact=p=0:nk=1:s="\ " | grep video)
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if [[ -n "$is_video" ]]; then
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eval "$command"
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else
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#eval "$command" && rm "$file"
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fi
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done
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exit 0
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