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#!/bin/sh
set -u
MAX_MIN_DIM=720
if test $# -lt 2 || test $# -gt 3; then
printf 'usage: %s input-file output-file [max-min-dim]' "$0" >&2
exit 3
fi
err () {
colour="$1"
format="$2"
shift 2
printf '\x1b['"${colour}m${format}"'\x1b[m\n' "$@" >&2
}
alert () { err "1;31" "$@"; }
header () { err "1;34" "$@"; }
subheader () { err "34" "$@"; }
red () { err "31" "$@"; }
green () { err "32" "$@"; }
yellow () { err "33" "$@"; }
magenta () { err "35" "$@"; }
cyan () { err "36" "$@"; }
input="$1"
output="$2"
if test $# -ge 3; then
MAX_MIN_DIM="$3"
fi
if test ! -f "$input" || test ! -r "$input"; then
red 'Input file %s does not exist or is not a readable file, skipping'
exit 2
fi
if test -e "$output" || test -L "$output"; then
red 'Output file %s already exists, skipping'
exit 2
fi
header 'Transcoding %s' "$input"
subheader 'Outputing to %s' "$output"
dimensions=$(ffprobe -v error -select_streams v:0 -show_entries stream=width,height -of csv=s=x:p=0 -- "$input")
if test -z "$dimensions"; then
red 'An error occured, skipping'
exit 2
fi
oldwidth=$(printf '%s\n' "$dimensions" | cut -d 'x' -f 1)
oldheight=$(printf '%s\n' "$dimensions" | cut -d 'x' -f 2)
if test -z "$oldwidth" || test -z "$oldheight"; then
red 'An error occured, skipping'
exit 2
fi
scale=
if test "$oldwidth" -lt "$oldheight"; then
if test "$oldwidth" -gt "${MAX_MIN_DIM}"; then
magenta 'The smaller dimension (width) was %i, downscaling to %i' "$oldwidth" "${MAX_MIN_DIM}"
newwidth="${MAX_MIN_DIM}"
newheight=-2
scale="-vf scale=$newwidth:$newheight"
else
cyan 'The smaller dimension (width) was %i, keeping as it does not exceed %i' "$oldwidth" "${MAX_MIN_DIM}"
fi
else
if test "$oldheight" -gt "${MAX_MIN_DIM}"; then
magenta 'The smaller dimension (height) was %i, downscaling to %i' "$oldheight" "${MAX_MIN_DIM}"
newwidth=-2
newheight="${MAX_MIN_DIM}"
scale="-vf scale=$newwidth:$newheight"
else
cyan 'The smaller dimension (height) was %i, keeping as it does not exceed %i' "$oldheight" "${MAX_MIN_DIM}"
fi
fi
if test -z "$scale"; then
codec="$(ffprobe -v error -select_streams v:0 -show_entries stream=codec_name -of default=noprint_wrappers=1:nokey=1 -- "$input")"
if test -z "$codec"; then
red 'An error occured, skipping'
exit 2
fi
if test "$codec" = hevc; then
cyan 'Already encoded with HEVC, keeping video codec'
codec="-c:v copy"
else
magenta 'Encoded with %s, transcoding to HEVC' "$codec"
codec="-c:v libx265"
fi
else
codec="-c:v libx265"
fi
if test -z "$scale" && test "$codec" = '-c:v copy'; then
yellow 'The video is already small and encoded in HEVC, skipping'
exit 1
fi
ttysetting="$(stty -g)"
ffmpeg -i "$input" $scale $codec -c:a copy -- "$output"
ret=$?
stty -- "$ttysetting"
if test $ret = 0; then
oldsize=$(stat -c '%s' -- "$input")
newsize=$(stat -c '%s' -- "$output")
if test $newsize -ge $oldsize; then
p=$(( 100 * (newsize - oldsize) / oldsize ))
yellow 'The transcoded video was larger than the original (would increase by %i%%), skipping' $p
if ! rm -- "$output"; then
alert 'Failed to remove old file: %s' "$output"
fi
exit 1
else
p=$(( 100 * (oldsize - newsize) / oldsize ))
green 'The transcoded video was smaller than the original (reduced by %i%%), keeping' $p
exit 0
fi
else
red 'An error occured, skipping'
if ! rm -- "$output"; then
alert 'Failed to remove old file: %s' "$output"
fi
exit 2
fi
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