Speech Analysis

How to convert m4a to mp3 on mac using command line?

Use ffmpeg library and then run the following command (see more here)

ffmpeg sample-rubbish.mp3 -i sample-rubbish.m4a -codec:a libmp3lame -qscale:a 1

How to get number of channels from an audio - mono or stereo?

Install ffmpeg if you haven't already. Then run this command:

ffprobe -i yourFile.wav -show_streams -select_streams a:0

You will see the output that includes much more than the number of channels. Look out for:

channels=1

channel_layout=mono