Originally Posted by metalsaber
Technically there already is a display menu on the controller which displays which encoding is used along with audio codec is used.
I have three questions about the Display:
On my homebrew red laser HD discs with AC3 5.1 -- the Display reads AUDIO: English 1 Dolby D +
1) why is plain old Dolby Digital 2/3.1 being reported as "Dolby D +"? Perhaps it is assuming that because it is an HD DVD disc and the audio is Dolby Digital, that it must be "Dolby Digital Plus".
2) The Display's Audio Output says "Digital PCM." But which audio output are they referring to? My SPDIF is set to BITSTREAM, not PCM. And my receiver is getting bitstream. So am I correct to assume that the Display is referring to the HDMI audio output?
My HDMI output is set to "Downmixed PCM" because, according to A2's manual, that is the correct setting when using SPDIF audio. If you set it to AUTO or PCM, the manual claims the SPDIF audio level will be lowered. (I see some complaining about low audio levels.) So this could be the reason for the "Digital PCM" display.
BUT, if I switch it to AUTO as a test, the display continues to report "Digital PCM." According to the manual, in Auto Mode, PCM will be output when the disc is recorded in "Dolby Digital Plus" or "Dolby True HD" or "DTS-HD."
This seems to support the idea that the A2 is assuming any Digital Dolby on an HD DVD disc is "Dolby Digital Plus."
3) So let's assume that the A2 is assuming the audio on my disc is "Dolby Digital Plus" even though its not. According to the A2's manual, when SPDIF output is set to BITSTREAM (as mine is) "Dolby Digital Plus audio is converted to DTS." That's not happening! My receiver which supports both Dolby Digital and DTS, reports the bitstream signal from the SPDIF connection is "Dolby D."
So if the A2 is assuming "Dolby Digital Plus" is on my HD DVD, then it should be outputing DTS. If it's not assuming "Dolby Digital Plus" and is correctly finding "Dolby Digital" and outputing it -- which it is what it's doing -- why is the audio codec claiming the recording is "Dolby D +"?
By the way the "Dolby" indicator is ON -- as is the "2ch" indicator. (I understand the latter is a bug to fixed in the new firmware.)
The only answer I can come-up with is there is a bug in the A2's audio logic. After assuming incorrectly that the audio is "Dolby Digital Plus" it then tries to convert "Dolby Digital Plus" to DTS and discovers that its really just a "Dolby Digital" signal and correctly doesn't make the cross-conversion to DTS. Unfortunately, the Display continues to reflect the incorrect assumption.
ROBERT -- can you report this behavior to Toshiba please.