I'm using only the LAV Splitter currently. I also installed DirectVobSub to be able to see what audio stream is playing in WMC, and from there I can go into the LAV Audio Splitter and the "Status" tab to see what's happening.
I notice odd behavior when I play 2 different files. Note when I rip my .mkv's, if they are Blu Ray, I select not only the HD audio track, but I also select the lossy 5.1 track as well. Reason is because my receiver doesn't have HDMI and thus won't support HD audio currently. So for now I want to use Lossy, but in the future when I upgrade my receiver, my media will have the HD audio stream ripped already. In my LAV settings, I'm only bitstreaming Doly Digital and DTS. I'm not bitstreaming Dolby Digital Plus, True HD or DTS HD.
File 1: Star Trek, 2 audio streams: HD-Dolby True HD; Lossy-DD 5.1
File 2: Inception, 2 audio streams: HD-DTS HD; Lossy-DTS 5.1
When I play Star Trek, looking at my receiver I only see 2 channels lit up. I open DirectVobSub and see it is playing the HD audio track. I open LAV Audio Splitter when playing the file, "Status" I see input codec is "truehd" with 6 channels, output codec is downmixed to PCM (which explains the 2 channel on the receiver).
When I play Inception, looking at my receiver I see all 5.1 channels lit up. I open DirectVobSub and see it is playing the DTS-HD audio track. I open LAV Audio Splitter when playing the file, Status I see input codec is "dca" with 6 channels, output codec is bitstreaming.
EDIT: Looking in LAV, I see for "Star Trek" the codec it is using is "truehd", 6 channels coming in, and PCM going out. For "Inception", I see the codec it is using is "dca", 6 channels coming in and bitstreaming going out. I see that in the codecs page for LAV, they only have the one codec for DTS, which is "dca". So whether it is DTS or DTS-HD, both use the same codec. If a file has both DTS and DTS-HD audio tracks, they both get decoded by the same codec. Where it has seperate codecs for regular DD (ac3), and DD True HD (truehd). This could explain why a file with both ac3 and True HD tracks plays weird because both tracks would get processed by different codecs, and the truehd codec isn't setup to bitstream, and a file with both DTS and DTS-HD plays fine as there is only one codec, dca, that would process either track.
Edited by bobby2478 - 1/26/13 at 1:59pm