soundpost script

#!/bin/bash

echo -e "Usage: reverse-soundpost <soundpost>"

soundpost=$1
soundpostfilename=${soundpost##*'/'}
afterdot=${soundpostfilename##*'.'}
name=${soundpostfilename%%'['*}
beforebracket=${soundpostfilename%%']'*}
soundsource=${beforebracket##*'['}
link=$(echo "$soundsource" | tail -c +7 | sed 's|%2F|/|g; s|%3A|:|g')
sourceafterdot=${link##*'.'}
soundfile="/tmp/soundsource.$sourceafterdot"

echo "Sound source located as $link"

wget "$link" -O "$soundfile"
sleep 1

# Determine audio codec
audiocodec=$(ffprobe -v error -select_streams a:0 -show_entries stream=codec_name -of default=nokey=1:noprint_wrappers=1 "$soundfile")

# Determine container and audio codec options
if [[ "$audiocodec" == "opus" || "$audiocodec" == "vorbis" ]]; then
    container="webm"
    acodec="copy"
    vcodec="libvpx-vp9"
elif [[ "$audiocodec" == "aac" || "$audiocodec" == "mp3" || "$audiocodec" == "flac" ]]; then
    container="mp4"
    acodec="copy"
    vcodec="libx264"
else
    container="mp4"
    acodec="aac"
    vcodec="libx264"
fi

echo "Audio codec is $audiocodec — using .$container container, video codec $vcodec, audio codec $acodec"


if [ "$afterdot" == "gif" ]; then
    ffmpeg -stream_loop -1 -i "$soundpost" -i "$soundfile" -shortest -c:v "$vcodec" -c:a "$acodec" "$name.$container"
elif [[ "$afterdot" == "png" || "$afterdot" == "jpeg" || "$afterdot" == "jpg" ]]; then
    ffmpeg -loop 1 -i "$soundpost" -i "$soundfile" -shortest -c:v "$vcodec" -c:a "$acodec" -r 1 "$name.$container"
else
    ffmpeg -i "$soundpost" -i "$soundfile" -c:v copy "$name.$afterdot"
fi