102 lines
2.8 KiB
Nix
102 lines
2.8 KiB
Nix
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{ ... }: {
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text = ''
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# Convert between different formats.
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# By default tries to convert all files.
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# Usage: transcode <FORMAT> [FILES]
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function transcode() {
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local IFS=$'\n'
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local format=''${1}
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local targets=(''${@:2})
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[[ "''${targets}" = "" ]] && targets=($(_ls_file))
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# Report no format.
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if [[ "''${format}" = "" ]] || [[ "''${format}" =~ "." ]]; then
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_error "No format specified."
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help transcode
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return 2
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fi
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process() {
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# Define context names and status.
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local from="''${target##*.}"
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local to="''${format}"
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local output="''${target##*/}"
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output="''${output%.*}.''${to}"
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# Skip if file exists.
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[[ -f "''${output}" ]] && { _iterate_skip "Already exists."; return 0; }
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# Support multiple inputs.
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[[ "''${to}" = "mp3" ]] && from=""
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[[ "''${to}" = "flac" ]] && from=""
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[[ "''${to}" = "mka" ]] && from=""
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[[ "''${to}" = "mkv" ]] && from=""
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# Send convert.
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case "''${from}-''${to}" in
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"gz-xz"|"tgz-txz")
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_transcode_gz-xz "''${target}" "''${output}"
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;;
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"xz-gz"|"txz-tgz")
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_transcode_xz-gz "''${target}" "''${output}"
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;;
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"-mp3")
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_transcode_mp3 "''${target}" "''${output}"
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;;
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"-flac")
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_transcode_flac "''${target}" "''${output}"
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;;
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"-mka")
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_transcode_mka "''${target}" "''${output}"
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;;
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"-mkv")
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_transcode_mkv "''${target}" "''${output}"
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;;
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*)
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_error "Conversion ''${target##*.}-''${to} not supported."
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return 1
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;;
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esac
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}
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_iterate_targets process ''${targets[@]}
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}
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function _transcode_gz-xz() {
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[[ -f "''${2}" ]] && return 1
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pv "''${1}" | gzip -d | xz -9e > "''${2}"
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}
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function _transcode_xz-gz() {
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[[ -f "''${2}" ]] && return 1
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pv "''${1}" | xz -d | gzip -1 > "''${2}"
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}
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function _transcode_mp3() {
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ffmpeg -n -i "''${1}" -c:a libmp3lame -b:a 320k -f mp3 "''${2}"
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}
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function _transcode_flac() {
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ffmpeg -n -i "''${1}" -c:a flac -f flac "''${2}"
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}
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function _transcode_mka() {
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local braudio=$(_ffprobe_ba "''${1}")
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[[ ''${braudio} -gt 128 ]] && braudio=128
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ffmpeg -n -i "''${1}" -ac 2 -c:a libopus -b:a ''${braudio}k -vn "''${2}"
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}
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function _transcode_mkv() {
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local keyint=$(_ffprobe_keyint "''${1}")
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local braudio=$(_ffprobe_ba "''${1}")
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local fps=$(_ffprobe_fps "''${1}")
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[[ ''${braudio} -gt 128 ]] && braudio=128
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[[ ''${fps} -gt 30 ]] && fps=30
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# ffmpeg -n -i "''${1}" -c:a libopus -b:a ''${braudio}k -c:v libsvtav1 -crf 30 -svtav1-params "fast-decode=1:tune=0" -preset 8 -pix_fmt yuv420p10le -g ''${keyint} -vf "scale=-2:min'(1080,ih)'" "''${2}"
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ffmpeg -n -i "''${1}" -map 0 -map -v -map V -map -t -dn -c:s srt -ac 2 -c:a libopus -b:a ''${braudio}k -c:v libsvtav1 -crf 30 -svtav1-params "tune=0" -pix_fmt yuv420p10le -g ''${keyint} -vf "scale=-2:min'(1080,ih)' , fps=''${fps}" "''${2}"
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}
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'';
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}
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