Add VP9/Opus support, use VP8 by default

- support vp9 and opus
- switch to 2 pass encoding
- use ffmpeg -movflags +faststart instead of qtfaststart

pandora/settings.py

@@ -165,6 +165,7 @@ LOGGING = {
 AUTH_PROFILE_MODULE = 'user.UserProfile'
 AUTH_CHECK_USERNAME = True
 FFMPEG = 'ffmpeg'
+FFMPEG_SUPPORTS_VP9 = True
 
 #=========================================================================
 #Pan.do/ra related settings settings