[jdobbs]

Currently NicAudio is used for the decoding, and it won't decode TrueHD. But almost always the core is already at the maximum bitrate, so reencoding from the original TrueHD just isn't a concern. It might be possible for BD-RB to use DirectshowSource() for the audio reencode when the source's core bitrate is lower than that specified for output. LAV filters should decode TrueHD. But it is so rare that the core bitrate is lower than the needed target, that that change wouldn't be a priority.