72 lines
2.6 KiB
Bash
72 lines
2.6 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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print_help() {
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printf "Help: not implemented yet"
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}
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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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h) print_help
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exit 0;;
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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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# array over the number of channels of all streams
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readarray -t channels <<<"$(ffprobe -v error -select_streams a -show_entries stream=channels -of compact=p=0:nk=1 "$file")"
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# array over the bitrates of all streams
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readarray -t bitrates <<<"$(ffprobe -v error -select_streams a -show_entries stream=bit_rate -of compact=p=0:nk=1 "$file")"
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# number of audiostreams
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audiostreams=${#channels[@]}
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# set a channel dependend bitrate for every audio stream
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# https://wiki.xiph.org/Opus_Recommended_Settings
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# to use ffmpegs default just comment out this block
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bitrate_settings=""
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for ((index=0; index<audiostreams;index++)); do
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if [[ ${channels[index]} -eq 1 ]]; then
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if [[ $bitrates == 'N/A' || ${bitrates[index]} -gt 64000 ]]; then bitrate_settings="$bitrate_settings-b:a:$index 64k "; fi
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elif [[ ${channels[index]} -eq 2 ]]; then
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if [[ $bitrates == 'N/A' || ${bitrates[index]} -gt 128000 ]]; then bitrate_settings="$bitrate_settings-b:a:$index 128k "; fi
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elif [[ ${channels[index]} -lt 6 ]]; then
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if [[ $bitrates == 'N/A' || ${bitrates[index]} -gt 256000 ]]; then bitrate_settings="$bitrate_settings-b:a:$index 256k "; fi
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elif [[ $bitrates == 'N/A' || ${bitrates[index]} -gt 450000 ]]; then bitrate_settings="$bitrate_settings-b:a:$index 450k "; fi
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done
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# check if it contains video streams (Thumbnails etc. will be ignored)
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# use mkv for videos and for multiple audio streams
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is_video=$(ffprobe -v error -select_streams V -show_entries stream=codec_type "$file")
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if [[ ${#channels[@]} -gt 1 || -n "$is_video" ]]; then
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command="ffmpeg -i \"$file\" -map 0 -map -0:d -map -0:t -c copy -c:a libopus $bitrate_settings -v info -hide_banner \"${file%.*}.mkv\""
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else
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command="ffmpeg -i \"$file\" $bitrate_settings-v info -hide_banner \"${file%.*}.opus\""
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fi
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eval "$command" #&& rm "$file"
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done
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exit 0
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