[voiceinteraction} supported audio codecs in other standards

I took an action from the last call to check on audio codecs supported by
other standards. It looks like WebAudio, which is the one we were talking
about, just uses the HTML-5 codecs. I also checked on WebRTC, which is
another standard that heavily uses audio. 

1.	HTML-5 audio element required formats
https://en.wikipedia.org/wiki/HTML5_audio#Supported_audio_coding_formats
(PCM, MP3, AAC, Vorbis, Opus and FLAC)
2.	WebRTC required codecs
https://developer.mozilla.org/en-US/docs/Web/Media/Formats/WebRTC_codecs
(Opus, PCM A-law and PCM mu-law)

 

I think we could just require support for the superset of these for
interoperability of voice assistants. Thoughts?