How to convert AAC 5.1 into AC3 5.1

[Lupo Silenzioso]

I don' like aac , since i can't hear it from my amplifier when i link my pc to it through the spdif output... it is a well known problem.

How can i convert correctly a AAC 5.1 to AC3 5.1? I'm looking for a guide but i find nothing, even on doom9.org

[bobsc]

Decode to wav with FAAD2, and then encode to AC3.

[KpeX]

You can playback the AAC and reencode to AC3 on the fly using DolbyOutDS by Han. See the AAC FAQ #12 linked in my sig.

[Lupo Silenzioso]

thanks, i try it but it seems that it still doesn't work.. :-(
i launch the reg.bat file of thi filter.
I use TCMP and if i click on the green arrow om my systray i can see that the Dolby Out DS filter is active.

While when an avi with audio ac3 5.1 is playing i can hear a 5.1 sound (the amplifier recognize that) , now , even with this new filter, the sound is still stereo :-(( and i'm sure that it is 5.1

Do i have to set up correctly the other filters? in example the matrix mixer? or the CoreAAC? in the latter the "downmix to 2 channels" is deactivated. In the matrix mixer the "3/2 5.1 channels output " is selected.

For the DolbyOut DS I select the 640 kbps .

[Haaan]

Note that DolbyOutDS is reported to work only with 48KHz input for now. Please be patient ;)

[Lupo Silenzioso]

are you the creator of DolbyOutDS? Nice to meet you! :-)
i try different mkv with audio aac 5.1, and i'm sure that some of them are 48 kHz.
But it still doesn't work!
I see that the direct vob sub loads this filter (as i said before).
Is there anything i can do?
do you have some little example of aac 5.1 audio i can try to work with this filter?

[Haaan]

Normally you don't have to use Matrix Mixer.

Actually, if DolbyOutDS is loaded it means that he has a 6 channel input, and since it does support only 6 channel output it's strange that your sound is stereo. Have you tried to play a AC3 file to see if it is not a problem with your SPDIF connection ? If you have, maybe you may try to deregister Matrix Mixer, just for testing...

[Lupo Silenzioso]

yes, the ac3 files play correctly. I hear them without problems for a long time. I'll try to deregister Matrix mixer...
The strange is that not for all mkv + aac 5.1 the DolbyOutDS filter seems to be loaded , even if they are 48 khz....
i can see if it is present in the DirectVob Sub green arrow

[Haaan]

maybe you can send me a short sample ?

[ChristianHJW]

Lupo,

use graphedit to test all the filter connections until this works stable, then try to reproduce it with TCMP or another player ....

[Lupo Silenzioso]

great!! Chrsitian, can i kiss you? :p
i dw and use graphedit, a wonderful and powerful program: congratulations to its creator!
Now my amplifier, through the SPDIF output, recognize the 5.1 audio thanks to Haan's filter: but only when i use graphedit! i see that the DolbyOutDS is the last box before my sound card device (Extigy). And before Dolbyoytds there is Matrix mixer, as i expected.

What can i do to listen correctly even with TCMP without launching graphedit? i'm near to solve this problem, please help me!! So i will never convert more the aac into ac3...

Really i can't understand why does the haan's filter work with graphedit and without it not... Damn!!! it seems a joke, isn't it?

[P0l1m0rph1c]

Originally posted by Lupo Silenzioso
i dw and use graphedit, a wonderful and powerful program: congratulations to its creator!


You're congratulating Micro$oft? :P

You can use mmview to unregister filters that are getting in the way of your desired filters.