Saving the audio not saving in webm format and the visualizer doesn't provide visualization for webm format or any other formats

[Dihan141]

1. When I save the audio I recorded it is being saved as 'weba' format instead of 'webm' format.
2. When I upload a 'webm' format audio or any other format the visualization doesn't work. I can hear the audio but the waves don't appear as it appears when recording a audio.