オーディオを動画にするスクリプト

audio2mp4.sh

#!/bin/bash
set -eu

# フォントの関係でmacOS専用

if [ -z "${1:-}" ]; then
	echo "USAGE:"
	echo "  $0 [AUDIO FILE]"
	echo ""
	exit 1
fi

SRCFILE=$1
DSTFILE=$(perl -E '$_="'$SRCFILE'"; s!\.(.+)$!.mp4!; say')

exec ffmpeg \
  -f lavfi -y -i color=size=640x360:duration=1:rate=1:color=blue \
  -i "$SRCFILE" \
  -map 0:v -map 1:a \
  -vf "drawtext=fontfile=/System/Library/Fonts/HelveticaNeue.ttc:fontsize=30:fontcolor=white:x=(w-text_w)/2:y=(h-text_h)/2:text='Audio Only'" \
  -ab 160k \
  "$DSTFILE"