You may need to use converter software to convert your MP3 files to the required codec version (MPEG version 2) and bit rate (48 kbps). One option for this is a command-line tool, FFmpeg. The following command converts the provided <input-file> to an MP3 file that works with the audio tag.
ffmpeg -i <input-file> -ac 2 -codec:a libmp3lame -b:a 48k -ar 16000 <output-file.mp3>
Another option is Audacity:
- Open the file to convert.
- Set the Project Rate in the lower-left corner to
16000. - Click File > Export Audio and change the Save as type to
MP3 Files. - Click Options, set the Quality to
48 kbpsand the Bit Rate Mode toConstant.
This requires the Lame library, which can be found at: http://lame.buanzo.org/#lamewindl.
Audio Reporting for Smart Speakers 