Create Delay File
ffmpeg -f lavfi -i anullsrc=r=44100:cl=mono -t 0.50 -acodec libmp3lame -ar 22050 -b:a 128k silence_0.50s.mp3
ffmpeg -f lavfi -i anullsrc=r=44100:cl=mono -t 1 -acodec libmp3lame -ar 22050 -b:a 128k silence_1s.mp3
ffmpeg -f lavfi -i anullsrc=r=44100:cl=mono -t 0.50 -acodec libmp3lame -ar 22050 -b:a 128k silence_0.50s.mp3
ffmpeg -f lavfi -i anullsrc=r=44100:cl=mono -t 1 -acodec libmp3lame -ar 22050 -b:a 128k silence_1s.mp3