49 lines
1.2 KiB
Bash
49 lines
1.2 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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# 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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echo "extension is $extension"
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for file in **/*.@($extension); do
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channels=$(ffprobe "$file" -show_entries stream=channels -select_streams a -of compact=p=0:nk=1 -v 0)
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streams=$(echo "$channels" | wc -l)
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if [ streams -gt 1 ]; then
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echo "Error: Automatic Bitrate is not supported for files with multiple audiostreams. The default bitrate of 128k will be used"
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channels="2"
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fi
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case $channels in
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1) bitrate="64k";;
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2) bitrate="128k";;
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6) bitrate="256k";;
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8) bitrate="450k";;
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*) continue;;
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esac
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# https://wiki.xiph.org/Opus_Recommended_Settings
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ffmpeg -threads 4 -v 0 -i "$file" -map 0 -c:a libopus -b:a $bitrate "${file%.*}.opus" && rm "$file"
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done
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exit 0
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