nix/home/program/bash/module/Transcode.nix

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2024-04-06 03:03:58 +03:00
{ ... }: {
text = ''
# Convert between different formats.
# By default tries to convert all files.
# Usage: transcode <FORMAT> [FILES]
function transcode() {
local IFS=$'\n'
local format=''${1}
local targets=(''${@:2})
[[ "''${targets}" = "" ]] && targets=($(_ls_file))
# Report no format.
if [[ "''${format}" = "" ]] || [[ "''${format}" =~ "." ]]; then
_error "No format specified."
help transcode
return 2
fi
process() {
# Define context names and status.
local from="''${target##*.}"
local to="''${format}"
local output="''${target##*/}"
output="''${output%.*}.''${to}"
# Skip if file exists.
[[ -f "''${output}" ]] && { _iterate_skip "Already exists."; return 0; }
# Support multiple inputs.
[[ "''${to}" = "mp3" ]] && from=""
[[ "''${to}" = "flac" ]] && from=""
[[ "''${to}" = "mka" ]] && from=""
[[ "''${to}" = "mkv" ]] && from=""
# Send convert.
case "''${from}-''${to}" in
"gz-xz"|"tgz-txz")
_transcode_gz-xz "''${target}" "''${output}"
;;
"xz-gz"|"txz-tgz")
_transcode_xz-gz "''${target}" "''${output}"
;;
"-mp3")
_transcode_mp3 "''${target}" "''${output}"
;;
"-flac")
_transcode_flac "''${target}" "''${output}"
;;
"-mka")
_transcode_mka "''${target}" "''${output}"
;;
"-mkv")
_transcode_mkv "''${target}" "''${output}"
;;
*)
_error "Conversion ''${target##*.}-''${to} not supported."
return 1
;;
esac
}
_iterate_targets process ''${targets[@]}
}
function _transcode_gz-xz() {
[[ -f "''${2}" ]] && return 1
pv "''${1}" | gzip -d | xz -9e > "''${2}"
}
function _transcode_xz-gz() {
[[ -f "''${2}" ]] && return 1
pv "''${1}" | xz -d | gzip -1 > "''${2}"
}
function _transcode_mp3() {
ffmpeg -n -i "''${1}" -c:a libmp3lame -b:a 320k -f mp3 "''${2}"
}
function _transcode_flac() {
ffmpeg -n -i "''${1}" -c:a flac -f flac "''${2}"
}
function _transcode_mka() {
local braudio=$(_ffprobe_ba "''${1}")
[[ ''${braudio} -gt 128 ]] && braudio=128
ffmpeg -n -i "''${1}" -ac 2 -c:a libopus -b:a ''${braudio}k -vn "''${2}"
}
function _transcode_mkv() {
local keyint=$(_ffprobe_keyint "''${1}")
local braudio=$(_ffprobe_ba "''${1}")
local fps=$(_ffprobe_fps "''${1}")
[[ ''${braudio} -gt 128 ]] && braudio=128
[[ ''${fps} -gt 30 ]] && fps=30
# 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}"
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}"
}
'';
}