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#!/bin/sh
# Compresses a video to a target size, for configuration see VARIABLES
# From: https://trac.ffmpeg.org/wiki/Encode/H.264#Two-PassExample
#
# $1: input file
# VARIABLES
video_codec="libx264"
audio_codec="aac"
audio_bitrate="96"
target_size="8"
MEGABIT="8388"
# Main
input="$1"
if [ -z "$input" ]
then
>&2 printf 'Usage: discord_compress <input>\n'
exit 1
fi
duration="$(date -u -d @"$(ffprobe -show_entries format=duration -v quiet -of csv="p=0" -i "$input")" +'%s')"
video_bitrate="$(((target_size * MEGABIT / duration) - audio_bitrate))"
[ "$video_bitrate" ] || exit 1
common_args="-hide_banner -v quiet -stats -y -hwaccel auto -i $input -c:v $video_codec -b:v ${video_bitrate}K"
set -ex
ffmpeg $common_args -pass 1 -an -f null /dev/null
ffmpeg $common_args -pass 2 -c:a "$audio_codec" -b:a "${audio_bitrate}K" compressed_"${input%.*}".mp4
rm -f ffmpeg2pass*.log*
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