Better codec list

[est31]

It would be cool to have a better list of codecs. For the current list:

• mp3 and ogg/vorbis are both decades old and shouldn't really be used for encoding new media
• aac is patent encumbered; you can't freely distribute decoders/encoders without paying a fee

There is also no lossles codec listed.

mp3 and aac both have the best cross browser support, while aac support for firefox depends on OS support due to the patent issues.

Instead, I'd suggest:

• Using ogg/opus as the default codec. Its decoders/encoders can be distributed without a fee. Its only issue is the missing support by safari and internet explorer.
• Keeping aac for compatibility with safari and internet explorer, both which don't support ogg/opus
• Providing a flac version for the lossless fans, and to enable encoding to better formats in the future without generational loss.
• Maybe keeping mp3 as well because of its good support by third party hardware (for when no aac support is available)