Update MediaRecorder preferences

[davekiss]

After consulting with @philcluff @gkatsev and @cjpillsbury -- this is the consensus for the recommended mimeType stack for MediaRecorder for our use case.

• It provides greatest compatibility across recording devices
• It's a fair tradeoff for the resulting file quality vs vp9
• It has good compatibility for uploading to and hosting by Mux

      const preferredOptions = { mimeType: 'video/mp4;codecs=avc1' };
      const backupOptions = { mimeType: 'video/webm;codecs=vp9' };
      const lastResortOptions = { mimeType: 'video/webm;codecs=vp8,opus' };

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[eropple]

I'm curious (this is outside my wheelhouse) - why is opus a last-resort audio codec? (or is it implied by the other codec options?)

[dylanjha]

@davekiss is this good to merge?

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[davekiss]

@dylanjha This should be g2g, can you try a recording on your end to sanity check?