#!/usr/bin/env bash

# This is for reencoding an AVI video. I wasn't able to play the encoded videos
# on my phone when using libx264 and libx265 encoders, but mpeg4 works. Also
# I'm using the aac codec because some old avi's were using a codec that's not
# supported in the mp4 container.

if which tput >/dev/null 2>&1; then
    ncolors=$(tput colors)
fi
if [ -t 1 ] && [ -n "$ncolors" ] && [ "$ncolors" -ge 8 ]; then
    RED="$(tput setaf 1)"
    GREEN="$(tput setaf 2)"
    YELLOW="$(tput setaf 3)"
    BLUE="$(tput setaf 4)"
    MAGENTA="$(tput setaf 5)"
    CYAN="$(tput setaf 6)"
    BOLD="$(tput bold)"
    NORMAL="$(tput sgr0)"
else
    RED=""
    GREEN=""
    YELLOW=""
    BLUE=""
    MAGENTA=""
    CYAN=""
    BOLD=""
    NORMAL=""
fi

if [[ $1 == "" || $2 == "" ]]; then
    printf "${BOLD}${RED}Usage: $0 <filename> <bitrate, e.g. \"4000k\"> <optional output name>${NORMAL}\n"
    exit 1
fi

filename=$(basename -- "$1")
extension="${filename##*.}"
filename="${filename%.*}"

bitrate="$2"

output_name="$3"
if [[ $output_name == "" ]]; then
    output="${filename}_CONVERTED-${bitrate}.mp4"
else
    output="${output_name}.mp4"
fi

printf "\n${YELLOW}${BOLD}Encoding '$filename.$extension' with target bitrate $bitrate | output: $output${NORMAL}\n"
ffmpeg -i "$filename.$extension" -c:a aac -c:v mpeg4 -b:v $bitrate "$output"
printf "\n${GREEN}${BOLD}Done encoding '$filename.$extension' to '$output'${NORMAL}\n\n"