What is the right command to convert an mp3 file to the required codec version (MPEG version 2) and bit rate (48 kbps) for Amazon Alexa SSML? : <p>I am trying to convert an mp3 file to the format expected by the audio tag in the Amazon Alexa SSML markup language as described here: <a href="https://developer.amazon.com/public/solutions/alexa/alexa-skills-kit/docs/speech-synthesis-markup-language-ssml-reference">https://developer.amazon.com/public/solutions/alexa/alexa-skills-kit/docs/speech-synthesis-markup-language-ssml-reference</a></p>

<p>The documentation recommends using <a href="https://www.ffmpeg.org/ffmpeg.html">https://www.ffmpeg.org/ffmpeg.html</a></p>

<p>I tried this command but can't find the right codec to use:
<code>ffmpeg -y -i input.mp3 -ar 44100 -ab 48k -codec:a mpeg2 -ac 1 output.mp3</code></p>

<p>I know I need to convert the file because Alexa fails with the following error: <code>The audio is not of a supported MPEG version</code></p>
