Digital Audio Output for BD-ROM
This section explains the S/PDIF and HDMI digital audio output behavior for BD-ROM discs.
Synchronization with Vista Device Playback Settings
WinDVD syncs with the audio playback device setting in the Vista and Windows 7 operating systems.
WinDVD audio settings will adjust accordingly once Vista and Windows 7 audio settings are changed.
Bypass and Non-bypass modes
To determine whether WinDVD should bypass the audio stream, the Dolby Digital checkbox must be checked in Supported Formats tab of the Digital Output Device Properties window, which is also known as Bypass Mode.
Actual results depend on the capability of the external decoder.
In Non-bypass Mode (Dolby Digital is unchecked), WinDVD will decode the audio stream and the actual result will depend on the features enabled in WinDVD.