I just upgraded my Windows MythTv (and primary Fedpra 20 backend) to .27-fixes. I had audio working fine through my HDMI or local speakers on .25 on Windows 8.1. Now Audio not working whether it's through HDMI or through Windows 8.1 itself on latest version
fixes/0.27 (v0.27.4-6-ge0b0027-dirty)
2014-11-02 17:41:24.629292 N AudioPlayer: Enabling Audio
2014-11-02 17:41:25.285811 I AFD: codec AC3 has 2 channels
2014-11-02 17:41:25.286812 I AFD: Opened codec 0x10f81640, id(AC3) type(Audio)
2014-11-02 17:41:25.298816 I AFD: Opened codec 0x1125a3a0, id(H264) type(Video)
2014-11-02 17:41:25.328872 I AOBase: Opening audio device 'DirectX:Speakers / H
P (IDT High Definition Audio CODEC)' ch 2(2) sr 48000 sf signed 16 bit reenc 0
2014-11-02 17:41:25.349814 E AudioOutput Error: Unsupported format for device 0
:Primary Sound Driver
2014-11-02 17:41:25.349814 I AOBase: Aborting reconfigure
2014-11-02 17:41:25.349814 N AudioPlayer: Disabling Audio, reason is: Unsupport
ed format for device 0:Primary Sound Driver
In the setup screen I am able to test and the playback is ok except with Windows:. DirectX and DirectX Speakers work fine.