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Topic: Audio Cd in Dolby Digital 5.1 (Read 11897 times) previous topic - next topic
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Audio Cd in Dolby Digital 5.1

Hi there,
I have recently bought an Audio Cd in DD 5.1, this album is "Metallica - Cunning Stunts".
I have a soundblaster audigy and a 5.1 speakers set. So i said to myself "Why not? I will test how sounds a 5.1 album, audigy has AC3 integrated decoder".....
The problem is that these are Audio CDs not files in Ac3....I have been trying PowerDVD 5 platinum, WinDVD 5 platinum and Creative Playcenter. I Also convert the wavs extracted with eac in Ac3 or 5.1 ogg, with BeSweet. Alway the same results: when i try to play this damned cd (or the tracks in ac3 or ogg) i hear a noise from all the 5 speakers, like a gust of a sub-machine.....

Please, you may excuse may english, i'm Italian...

Thanks guys....
Mpc Q7 /  --alt -preset extreme/standard

Audio Cd in Dolby Digital 5.1

Reply #1 –
The same here with Alan Parsons - On Air (DTS 5.1)
MPC: --quality 10 --xlevel (v. 1.15s) (archive/transcoding)
MP3:  LAME 3.96.1 --preset standard (daily listening/portable)

Audio Cd in Dolby Digital 5.1

Reply #2 –
No one can help me/us ??
Mpc Q7 /  --alt -preset extreme/standard

Audio Cd in Dolby Digital 5.1

Reply #3 –
It could be 44.1 KHz PCM encoded AC3 compressed data. It has to be decoded first to be properly listened to. If this is the case, decoding is possible with an external hardware AC3 decoder receiving in a bit-perfec way the 44.1 KHz encoded digital stream. I don't know much about decoding it by software.

Audio Cd in Dolby Digital 5.1

Reply #4 –
try to play the cd in your cd player, then in your dvd player and on the copmuter using dvd software, cd player and a cd ripping tool if you don't know what kind of cd it is.

I don't have dvd player, i only have the computer dvd player. But theese are CD roms not DVD....
Mpc Q7 /  --alt -preset extreme/standard

Audio Cd in Dolby Digital 5.1

Reply #5 –
What's on the CD is an AC-3 bitstream stored in CD audio format. Where the audio data is normally found, there is packed encoded digital data (like computer data, if you like). So if you just listen to it directly, you'll hear that rushing noise.

You need a decoder. Actually, you probably need two. One to convert the .wav file containing packed AC3 data back into a pure AC3 file, and then whatever software came with your sound card to play (i.e. decode) the AC3 file and send the result to your speakers.

You do not want to encode the .wav file to an AC3 file (that's probably what you did with BeSweet), because it's already been encoded, and it's already in AC-3 format, but packed in a special way. You just want to unpack it, and store it as a pure AC-3 file.

IIRC dspguru (@ doom9.org) may already have a tool to do this - maybe a search will turn it up.


You could try finding a real AC-3 file (see the surround sound radio thread - the second link has plenty), and check that your software plays this correctly.

Cheers,
David.

EDIT:

AC-3 WAV file = a WAV file with AC-3 data in the sample values.
If you listen to the data without decoding it, it sounds like a rushing noise.

AC-3 file encoded from WAV file = AC-3 file which sounds the same as the WAV file.
(just like an mp3 encoded from a WAV file sounds the same as the WAV file).

So, if you take an AC-3 WAV file, and encode it to AC-3, you get an AC-3 that sounds the same as the AC-3 WAV file - i.e. a rushing noise.

You need to decode the data from AC-3 WAV to AC-3, rather than encode the audio from AC-3 WAV to AC-3.

I don't feel like I'm explaining this very well, but I hope you get the point!

Audio Cd in Dolby Digital 5.1

Reply #6 –
... a cdrom with purely ac3 tracks? where did you by it?

which file extension do the files have? .ac3? can you copy the files on your harddisc? you could try to play the ac3 files with a dvd player software like powerdvd or mplayer. you could try to decode the ac3files directly to .wav with mencoder or transcode.

BadHorsie

Audio Cd in Dolby Digital 5.1

Reply #7 –
That's not a big deal, really. I have a Wish You Were Here CD that is encoded in 5.1 DTS.

It's playable on standalone DVD players, software DVD players (PowerDVD/WinDVD) and some rare audio CD players that can decode DTS.

You can make one of these CDs yourself using this tool:
http://www.surcode.com/low/cd/cd.htm

Audio Cd in Dolby Digital 5.1

Reply #8 –
Quote
You need a decoder. Actually, you probably need two. One to convert the .wav file containing packed AC3 data back into a pure AC3 file, and then whatever software came with your sound card to play (i.e. decode) the AC3 file and send the result to your speakers.

You could try finding a real AC-3 file (see the surround sound radio thread - the second link has plenty), and check that your software plays this correctly.

Excuse me, I have an Audigy, with built-in AC3 Decoder,  isn't it a decoder??
About the software i'v tried PowerDVD, WinDVD, WMP 9 and Creative Playcenter.
I haven't got external Decoders/Amplies......( the speakers are Creative Inspire 5.1 5300)...

The AC3 files works perfectly (tested many ac3 samples and movies).....I can extract track from the cd into wav format....what should i do after ???

Help me, theese cds weren't cheap......   
Mpc Q7 /  --alt -preset extreme/standard

Audio Cd in Dolby Digital 5.1

Reply #9 –
@rjamorim:

thanks for the info's. too bad it's a windows only tool. i would give it really a try.

@Genjo Sanzo:

if i understand this thing correct, you should be able to extract a .wav file with a usual cd ripper and just rename them to .ac3. powerdvd or something else should be able to play this file.

BTW: does anyone know a "free" dts encoder? maybe for linux?  a "free" ac3 encoder for linux would be also nice for testing.

BadHorsie

Audio Cd in Dolby Digital 5.1

Reply #10 –
Quote
BTW: does anyone know a "free" dts encoder? maybe for linux?   a "free" ac3 encoder for linux would be also nice for testing.

There's an AC3 encoder in ffmpeg. Quality is horrendous though. It's kinda like "reference software".

Audio Cd in Dolby Digital 5.1

Reply #11 –
Quote
if i understand this thing correct, you should be able to extract a .wav file with a usual cd ripper and just rename them to .ac3. powerdvd or something else should be able to play this file.

That doesn't work because, though the AC-3 data is in there, it's been re-packed and re-formatted. For example, there are huge blanks inserted in there to make the 448kbps (or whatever was used) of AC-3 fill the 1.4Mbps of CD.

But the correct procedure is to rip the CD>wav, "decode" it to AC-3, and then play it using the software that came with the soundcard.


Genjo Sanzo, you're sounding surprised that you've bought a Creative product, but it doesn't do what it says it does. ;-) OK - that's a bit harsh - but they really should include the software to do this (automatically), and it seems they don't.

Robert has given a link which explains how these CDs are created, and here's another one:
http://www.backupdvd.info/Members/video/Dolby.shtml


But what you want to do is the opposite. Go to doom9.org, and ask for a tool which will take a Dolby Digital Wav file, and convert it back into a pure AC-3 file. If anyone here can answer that question, I'm sure they will, but if not, try doom9...

Cheers,
David.

Audio Cd in Dolby Digital 5.1

Reply #12 –
1. rip the waves.
2. for each wave :
run BeSliced, drag the wave into cantor's picture, and select AC3.
that's all !


edit:
to do the opposite, read the BeSure guide :
http://DSPguru.doom9.org/guides.html

Audio Cd in Dolby Digital 5.1

Reply #13 –
Quote
1. rip the waves.
2. for each wave :
run BeSliced, drag the wave into cantor's picture, and select AC3.
that's all !


edit:
to do the opposite, read the BeSure guide :
http://DSPguru.doom9.org/guides.html

This precedure gives me a 0 bytes file, and when i try to open this file with any player, the pc crashes.....
this damned cd is making me mad.... 
Anyway thankyou for the help....
Mpc Q7 /  --alt -preset extreme/standard

Audio Cd in Dolby Digital 5.1

Reply #14 –
I've tried AC3 Machine (for besweet) but the result is an "empty" file of different dimension. Only silence. Output in 5.1 was a file of 18 megs, tried in stereo, and the output was a 9 megs file, but both were empty.....
Why the dvds in DD 5.1 works perfectly, and the generated files doesn't work???
Mpc Q7 /  --alt -preset extreme/standard

Audio Cd in Dolby Digital 5.1

Reply #15 –
cut the first 0.5mb of the file and upload in here.

Audio Cd in Dolby Digital 5.1

Reply #16 –
In a few moments i will upload a sample on my ftp....
please wait...
Mpc Q7 /  --alt -preset extreme/standard

Audio Cd in Dolby Digital 5.1

Reply #17 –
Arghhhh, stupid ftp is down...

Hemmm, how can i upload here?
Mpc Q7 /  --alt -preset extreme/standard

Audio Cd in Dolby Digital 5.1

Reply #19 –
I've fixed the problem

Here is the file Sample

IMPORTANT : YOU MUST RENAME THE DOWNLOADED FILE FROM Segment.raz to Segment.rar.
I had to change the extension 'cause this ftp doesn't allow to upload rar files....
Mpc Q7 /  --alt -preset extreme/standard

Audio Cd in Dolby Digital 5.1

Reply #21 –
i don't have the time to download right now, have to split..
but could you please post BeSliced logfile ?

Audio Cd in Dolby Digital 5.1

Reply #22 –
Here's the log file.
LOG

PS. Here in Milano are 2 am, i'm gonna sleep now (must get up at 7)....Thankyou for the help, and goodnight  ....
Mpc Q7 /  --alt -preset extreme/standard

Audio Cd in Dolby Digital 5.1

Reply #23 –
good night!

..try the following commandline :
BeSplit.exe -core( -input xxx.wav -prefix yyy -fix -logfile BeSplit.txt -type ddwav )


bye..


edit : xxx.wav is the inputfilename, yyy is the output folder name.

Audio Cd in Dolby Digital 5.1

Reply #24 –
You're a f*ck*d'up GOD !!!!
If you'll go in italy someday you must contact me, and once you're in italy i will offer you a Beer....no...10 beers...(excuse me for the construction of the sentence, is my maximum)
no other words...THANKS.....
Mpc Q7 /  --alt -preset extreme/standard