I need some app to extract/decode LCRS information to any Lossless format

[underp]

I don't have a Pro Logic system right now, and i want to check the results of some tests that i've been doing for 4:2 .

Does anyone know of some app to extract LCRS information ?


Thanks in advance.

[guns1inger]

From what ? Prologic was an analogue method, so there aren't discrete channels in the same sense as AC3. If you have just a stereo source - say a VHS tape - it will be difficult to extract the prologic information. If you have an AC3 file with prologic flags then is definately possible.

[underp]

What i want, is to get a "PRO Logic information" in WAV format, from some mixings that i've been doing.

I have the material in WAV and AC3 2.0 also.


Is this possible ?

[KBeee]

The "Pro Logic" information is just stereo. There is nothing special in the audio, except it may have been tweaked to make the out of phase signals a little more pronounced, for better rear effects.
If I remember corrrectly, the original pro logic was pretty much just a Hafler setup + centre speaker connection, with a half-strength DolbyB noise reduction circuit stuck in so Dolby could claim license fees.
If you don't have a pro logic system, you might like to try wiring 4 speakers up in a "Hafler" configuration from a normal stereo output to get an idea of what's happening.

[guns1inger]

If you have the stereo track, have a read of this article

http://en.wikipedia.org/wiki/Dolby_Pro_Logic#Dolby_Encoding_Matrices

At the bottom are the matrices used, so you can build the channels yourself with phase shifting.

This might also interest you

http://forum.doom9.org/showthread.php?s=&threadid=27936

[3dsnar]

You can play the sound prologic sound with our DirectShow filter which has a built in DPLII decoder
and it will generate 6 channel stream...which is sent directly to the rendering device.
But I do not know if you
can capture it to 6 channel wave...
But at least you can perform some listenings.