nix/home/program/bash/module/Ffmpeg.nix

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{ ... }: {
text = ''
# Mux audio into containers. File names in sound and current dirrectories must match.
# Usage: ffmpeg_mux_audio <SOUND> <OUTPUT DIR>
function ffmpeg_mux_audio() {
if [[ "''${1}" = "" ]]; then
help ffmpeg_mux_audio
return 2
fi
for file in *; do ffmpeg -i "$file" -i "$1"/"$file" -c copy -map 0:v:0 -map 1:a:0 -shortest "$2"/"$file"; done
}
# Mux cover into music file.
# Usage: ffmpeg_mux_cover <FORMAT> <COVER>
function ffmpeg_mux_cover() {
if [[ "''${1}" = "" ]]; then
help ffmpeg_mux_cover
return 2
fi
local format="''${1}"
local cover="''${2}"
mkdir out
case "''${format}" in
# "mka"|"mkv")
# for file in *.''${format}; do
# ffmpeg -i "''${file}" -attach "''${cover}" -map 0 -c copy -metadata:s:t mimetype="image/''${cover##*.}" -metadata:s:t:0 filename="cover.''${cover##*.}" "./out/''${file}" || return 1
# done
# ;;
*)
for file in *.''${format}; do
# ffmpeg -i "''${file}" -i "''${cover}" -map 0 -map 0:-v? -map 1 -codec copy -metadata:s:v title="Album cover" -metadata:s:v comment="Cover (front)" -disposition:v attached_pic ./out/"''${file}" || return 1
ffmpeg -i "''${file}" -i "''${cover}" -map 0 -map 1 -codec copy -metadata:s:v title="Album cover" -metadata:s:v comment="Cover (front)" -disposition:v attached_pic ./out/"''${file}" || return 1
done
;;
esac
mv out/* .
rm -d out/ && rm "''${2}"
}
# Generate music metadata from directory structure.
# Top dir is the Artist name like this: `The_Beatles`.
# Next are albums like this: `2010_My_love`.
# Inside are songs like this: `01_sample.flac`.
# Usage: ffmpeg_music_meta <FORMAT>
function ffmpeg_music_meta() {
if [[ "''${1}" = "" ]]; then
help ffmpeg_music_meta
return 2
fi
local format="''${1}"
ls *.''${format} &> /dev/null || return 1
local artist="''${PWD%/*}"; artist="''${artist##*/}"; artist="''${artist//_/ }"
local album="''${PWD##*/}"; album="''${album#*_}"; album="''${album//_/ }"
local year="''${PWD##*/}"; year="''${year%%_*}"
# local total=$(ls *.''${format} | wc -l)
mkdir out
for file in *.''${format}; do
local track="''${file%%_*}"; track=$((10#''${track})); [[ "''${track}" = "" ]] && track=0
local title="''${file#*_}"; title="''${title%.*}"; title="''${title//_/ }"
# echo "''${artist}; ''${album}; ''${year}; ''${track}; ''${title}"
# TODO: make it format-specific.
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ffmpeg -i "''${file}" -map 0 -c copy -metadata "artists=" -metadata "artist=''${artist}" -metadata "album_artist=''${artist}" -metadata "album=''${album}" -metadata "date=''${year}" -metadata "year=''${year}" -metadata "date_released=''${year}" -metadata "track=''${track}" -metadata "part_number=''${track}" -metadata "title=''${title}" ./out/"''${file}" || return 1
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done
mv out/* .
rm -d out/
}
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# Rotate the video clock-wise.
# Usage: ffmpeg_rotate <ANGLE> <TARGET>
function ffmpeg_rotate() {
if [[ "''${2}" = "" ]]; then
help ffmpeg_rotate
fi
local angle="''${1}"
local target="''${2}"
ffmpeg -display_rotation ''${angle} -i ''${target} -c copy _''${target} && mv _''${target} ''${target} || rm _''${target}
}
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# Get video FPS.
function _ffprobe_fps() {
local fps=$(ffprobe -v 0 -of csv=p=0 -select_streams v:0 -show_entries stream=r_frame_rate "''${1}")
[[ "''${fps}" = "" ]] && fps=30 || fps=$((fps))
echo "''${fps}"
}
# Get recommended keyframe interval for a file.
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function _ffprobe_keyint() {
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local fps=$(_ffprobe_fps "''${1}")
echo $((fps*5))
}
# Get audio bitrage. 128 by default.
function _ffprobe_ba() {
local ba=$(ffprobe -v error -select_streams a:0 -show_entries stream=bit_rate -of default=noprint_wrappers=1:nokey=1 "''${1}")
[[ "''${ba}" != "N/A" ]] && echo $((ba/1024)) || echo 128
}
'';
}