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#!/usr/bin/env bash
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shopt -s nullglob
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let playlist_duration_ms=0
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for song_file in */*.{mp3,ogg,m4a,flac,wav}; do
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playlist_duration_ms=$(expr $playlist_duration_ms + $(mediainfo --Inform="Audio;%Duration%" "$song_file"))
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done
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shopt -u nullglob
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let playlist_duration_secs=$(expr $playlist_duration_ms / 1000)
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let playlist_duration_mins=$(expr $playlist_duration_ms / 60000)
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let playlist_duration_remaining_secs=$(expr $playlist_duration_secs - $(expr $playlist_duration_mins \* 60))
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let playlist_duration_hours=$(expr $playlist_duration_mins / 60)
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let playlist_duration_remaining_mins=$(expr $playlist_duration_mins - $(expr $playlist_duration_hours \* 60))
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echo $playlist_duration_hours hours, $playlist_duration_remaining_mins minutes, $playlist_duration_remaining_secs seconds
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