.fetch-mix-5

#!/bin/bash -x
mix_id=uVa55WpCfM0
video_id=dUgdj_gB7S4
template='005 %(title)s (%(id)s).f%(format_id)s.%(ext)s'
ytv=https://www.youtube.com/watch?v

until
    set -- *"($mix_id)"*
    audio=$1
    test -f "$audio"
do
    sleep 10
    youtube-dl -f 'bestaudio[acodec^=?opus]/bestaudio/best' -o "$template" "$ytv=$mix_id"
done

until
    set -- *"($video_id)"*
    video=$1
    test -f "$video"
do
    sleep 10
    youtube-dl -f 'bestvideo[vcodec^=?vp9]/bestvideo/best' -o "$template" "$ytv=$video_id"
done

mix=${audio/).*/).mkv}

ffmpeg -i "$video" -i "$audio" -map 0:v -map 1:a -c:v copy -c:a copy ".$mix" &&
test -s ".$mix" &&
rm -v "$audio" &&
mv -vf ".$mix" "$mix"