Support FLAC playback in HTML5

[dmik]

Currently, we don't support MP3 and FLAC in HTML5 playback as can be seen in this test case: http://hpr.dogphilosophy.net/test/. This is because Mozilla doesn't know how to decode these formats on OS/2. We need to investigate on what options we have there.

[dmik]

So far, a comment from Dave Yeo from #12:

I believe on Linux it is gstreamer (which uses FFmpeg and other
libraries) and on Windows and OSX, it uses the system codecs. FLAC
shouldn't have any licence issues (libraries are a BSD type license).
MP3 has patent issues (which may be expired now and depends on country)

[dbanet]

Come on, for what I've posted #67 more than a year ago...

[dmik]

Ok, I'm only leaving FLAC here as MP3 is about to get some support in Firefox 44 once we are there, see #67. I see some traces that ffmpeg supports FLAC to some degree so we should dig into that direction perhaps. Anyway, t's not for the next beta.