AAC Faac versus Lav

[xyzzy]

My own subject tests were: opus > AAC (FDK) > AAC (FAAC) > AC3 > AAC (LAV)

Other codecs didn't have device support I wanted.  Pretty similar to ffmpeg's help that I hadn't seen before just now.

I re-encode mostly talking multichannel to DPL II with Opus at 112 kbps.