I write this to convert my old, multiple GiB, multimedia files to formats that are smaller in size and royalty free.
remove_extension() {
sed -E 's/^(.+)\.[^.]+$/\1/'
}
get_extension() {
sed -E '/^\.?[^.]+$/d; s/^.+\.([^.]*)$/\1/'
}
ffmpeg_av1_opus() {
if [ "$#" -lt 4 ]; then
return
fi
ffmpeg -n -i "$4" -c:v libsvtav1 -preset "$1" -crf "$2" -c:a libopus -vbr:a 1 -b:a "$3" "${5:-"$(echo "$4" | remove_extension)_ffmpeg_av1_$1_$2_opus_$3.mkv"}"
}
ffmpeg_av1_lossless_flac() {
if [ "$#" -eq 0 ]; then
return
fi
ffmpeg -n -i "$1" -c:v libsvtav1 -svtav1-params lossless=1 -preset -2 -c:a flac "${2:-"$(echo "$1" | remove_extension)_ffmpeg_av1_lossless_flac.mkv"}"
}
ffmpeg_opus() {
if [ "$#" -lt 2 ]; then
return
fi
ffmpeg -n -i "$2" -c:a libopus -vbr:a 1 -b:a "$1" "${3:-"$(echo "$2" | remove_extension)_ffmpeg_opus_$1.opus"}"
}
ffmpeg_flac() {
if [ "$#" -eq 0 ]; then
return
fi
ffmpeg -n -i "$1" -c:a flac "${2:-"$(echo "$1" | remove_extension)_ffmpeg_flac.flac"}"
}
ffmpeg_segment() {
if [ "$#" -lt 2 ]; then
return
fi
ffmpeg -n -i "$2" -c copy -map 0 -segment_time "$1" -f segment -reset_timestamps 1 "${3:-"$(echo "$2" | remove_extension)_ffmpeg_%04d.$(echo "$2" | get_extension)"}"
}
ffmpeg_concat_auto() {
local files=()
if [ "$#" -eq 0 ]; then
for f in *; do
test -f "$f" && files+=("$f")
done
else
files=("$@")
fi
ffmpeg -n -f concat -safe 0 -i <(printf "file '$PWD/%s'\n" "${files[@]}") -c copy "$(echo "${files[0]}" | remove_extension | sed -E 's/_ffmpeg_[0-9]+$//').$(echo "${files[0]}" | get_extension)"
}
ffmpeg_concat() {
if [ "$#" -lt 2 ]; then
return
fi
ffmpeg -n -f concat -safe 0 -i <(printf "file '$PWD/%s'\n" "${@:2}") -c copy "$1"
}
echo_non_ffmpeg() {
while IFS= read -r -d '' f; do
case "$f" in
*ffmpeg_*) ;;
*)
echo "$f"
;;
esac
done < <(find . -type f -print0)
}
remove_non_ffmpeg() {
while IFS= read -r -d '' f; do
case "$f" in
*ffmpeg_*) ;;
*)
rm -f -- "$f"
;;
esac
done < <(find . -type f -print0)
}
echo_ffmpeg() {
while IFS= read -r -d '' f; do
case "$f" in
*ffmpeg_*)
echo "$f"
;;
*) ;;
esac
done < <(find . -type f -print0)
}
remove_ffmpeg() {
while IFS= read -r -d '' f; do
case "$f" in
*ffmpeg_*)
rm -f -- "$f"
;;
*) ;;
esac
done < <(find . -type f -print0)
}
jxl_lossy() {
if [ "$#" -lt 2 ]; then
return
fi
cjxl -j 0 -e 10 -d "$1" "$2" "${3:-"$(echo "$2" | remove_extension).jxl"}"
}
jxl_lossless() {
if [ "$#" -eq 0 ]; then
return
fi
cjxl -j 1 -e 10 -d 0 "$1" "${2:-"$(echo "$1" | remove_extension).jxl"}"
}
multimedia_convert() {
(
shopt -s globstar nullglob
for f in **/*; do
[[ -f $f ]] || continue
local file=${f##*/}
local dir=${f%/*}
[[ $dir == "$f" ]] && dir=.
case ${file,,} in
*.gif)
if [[ ${file##*.} != gif ]]; then
if [[ -e "${f%.*}.gif" ]]; then
printf 'Skipping: output exists: %s\n' "$f" >&2
continue
fi
mv -- "$f" "${f%.*}.gif"
fi
;;
*.flac)
if [[ ${file##*.} != flac ]]; then
if [[ -e "${f%.*}.flac" ]]; then
printf 'Skipping: output exists: %s\n' "$f" >&2
continue
fi
mv -- "$f" "${f%.*}.flac"
fi
;;
*.jpg | *.jpeg | *.png)
local jxl="${file%.*}.jxl"
if [[ -e "$dir/$jxl" ]]; then
printf 'Skipping: output exists: %s\n' "$f" >&2
continue
fi
(
cd "$dir" &&
jxl_lossy 1 "./$file" "./$jxl" &&
rm -- "$file"
)
;;
*.avif | *.bmp | *.heic | *.ico | *.jp2 | *.tif | *.webp)
local png="${file%.*}.png"
if [[ -e "$dir/$png" ]]; then
printf 'Skipping: intermediate png exists: %s\n' "$f" >&2
continue
fi
local jxl="${file%.*}.jxl"
if [[ -e "$dir/$jxl" ]]; then
printf 'Skipping: output exists: %s\n' "$f" >&2
continue
fi
(
cd "$dir" &&
magick "./$file" "./$png" && {
jxl_lossy 1 "./$png" "./$jxl" &&
rm -- "$file" ||
true
} &&
rm -f -- "$png"
)
;;
*.3gp | *.mov | *.vob | *.wmv)
(
cd "$dir" &&
ffmpeg_av1_opus 4 40 24k "./$file" &&
rm -- "$file"
)
;;
*.avi | *.mkv | *.mp4)
(
cd "$dir" &&
ffmpeg_av1_opus 4 32 72k "./$file" &&
rm -- "$file"
)
;;
*.aac | *.mp3 | *.m4a | *.ogg)
(
cd "$dir" &&
ffmpeg_opus 96k "./$file" &&
rm -- "$file"
)
;;
*.wav)
(
cd "$dir" &&
ffmpeg_flac "./$file" &&
rm -- "$file"
)
;;
*)
continue
;;
esac
done
)
}