ffmpeg -i $1 -af "silenceremove=start_periods=1:start_duration=0.1:start_threshold=0.01,silenceremove=stop_periods=1:stop_duration=0.01:stop_threshold=0.01,dynaudnorm=framelen=30:gausssize=3" -c:a pcm_s16le -ar 16000 -ac 1 -f wav ./norm/$1