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Educate me on converting DTS-HD to DTS over SPDIF

post #1 of 5
2/14/11 at 12:02pm
Thread Starter 
Hello,

Currently I use my HTPC with an Integra receiver that does not have HDMI support. I use FFDshow audio SPDIF passthrough to pass DTS and Dobly Digital to my receiver.

After reading the forums, I have seen people mentioning converting DTS-HD and Dobly HD via software and passing it to the receiver over SPDIF to take advantage of the better origin source.

Can someone educate me how this can be done, and what codecs do I need to do this?

Thanks.
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post #2 of 5
2/14/11 at 12:14pm
It depends on the software you use to rip the movies. For instance, DVD-Fab has an option to extract the "DTS core" (or something like that) from the DTS-HD MA soundtrack instead of the DTS-HD MA into the resulting rip.

Is this what your asking for?
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post #3 of 5
2/15/11 at 6:14am
No conversion is necessary for DTS-HD as it is a core & residual type of compression. The core is already DTS-regular so outputting that is an easy matter for whatever software is doing the playback.

TrueHD on the other hand is MLP compression (same as used for DVD-A), and that must be decoded and then transcoded to AC3 in order to output as Dolby Digital.
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post #4 of 5
2/15/11 at 6:35am
No reason to convert.

- Every DTS-HD MA/HRA track has the DTS core.
- Every TrueHD track contains a DD *core* (maybe not a proper name...)

Another option is use an analog sound card: decode TrueHD/DTS-HD to LPCM (bit-perfect of course), then send to the sound card and output analog to the receiver. Then you don't lose the quality unlike using DTS/DD core.
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post #5 of 5
2/16/11 at 5:39am
Thread Starter 
so are you saying that if i'm using SPDIF optical out, and i play a movie with only DTS-HD audio. it should automatically play as DTS to my receiver over optical out?
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