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Audio file conversion for Alexa skills
# Convert audio to SSML compatible mp3
ffmpeg -i <input-file> -ac 2 -codec:a libmp3lame -b:a 48k -ar 16000 <output-file.mp3>
# Normalize audio
ffmpeg -i <input-file.mp3> -af loudnorm=I=-14:TP=-3:LRA=11:print_format=json -b:a 48k -ar 16000 <output-file.mp3>
# Do both at the same time
ffmpeg -i <input-file.mp3> -ac 2 -codec:a libmp3lame -af loudnorm=I=-16:TP=-3:LRA=11:print_format=json -b:a 48k -ar 16000 <output-file.mp3>
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