Convertir amr a mp3

ffprobe -show_entries format:stream -count_frames -count_packets -i mms-1.amr > input.txt
ffmpeg -i mms-1.amr -f s16le -c:a pcm_s16le output.raw
ffmpeg -f s16le -ar 8000 -ac 1 -i output.raw mms-1.wav
lame mms-1.wav final.mp3