SPDIF DVD Audio out question?

[taildragger]

I have a DVD payer with a Coax SPDIF output that I run into my computers sound card. I notice that the audio from some DVD's sound fine and are recordable. On the other hand there are some DVD's that just make inaudible noise. I'm guessing that this is because they are encrypted. I was wondering if these DVD's are truly encrypted and if there was any way to get rid of the noise and making these DVD's audible?

[taildragger]

Bump^

[Innershield]

Try using the left and right audio output instead of the digital output.

[StoVoKor]

I think your soundcard is only capable to decode PCM streams while your dvd sound is probably Dolby Digital or DTS coded...

[proxyx99]

While many sound cards are DD 5.1 almost none is DTS compatible. Probably the presence of DTS is messing things up (most likely). Check DVD's with DTS track and without... may be a solution. DD 5.1 is almost on every disc while DTS is on some, that in producers opinion are DTS worthy.

[MeTaLgEaRsOoTy]

i noticed that some soundtracks caused problems too.
it seemed to be that the stereo soundtrack was selected as standard instead of 5.1.
other times it seemed to be the DTS that was the main one.
just try to make sure that the stereo soundtrack or 5.1 is selected.
a few dvds i have automatically play the french or other language as soundtrack 1,whereas on another standalone,its the DTS thats selected automatically.
i.e:mars attacks...automatically selects on mine the music only soundtrack.not the speaking standard 5.1 soundtrack.

[Nelson37]

It is not encrypted, just encoded. Those that play correctly are outputting PCM audio thru the SPDIF, those that do not play are putting out a true AC-3 (or DTS ) stream. Very few soundcards will actually decode AC-3 or DTS, they are designed to do a "pass-thru" to an amp or speakers with on-board AC-3 or DTS decoder.