- #ffmpeg -f concat -safe 0 -i <(grep -o . <msg.txt | while read ch; do echo "file 'mp3/${ch^^}.mp3'"; done) -c copy output.mp3
- cat msg.txt | sed 's/./\L&/g' | sed ':a;N;$!ba;s/\n/~/g' | sed 's/ /_/g' | grep -o . | while read ch; do echo "file 'mp3/$ch.mp3'"; done >list.txt
- ffmpeg -f concat -safe 0 -i list.txt -c copy -y msg.mp3
- rm -f list.txt
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