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Old 12th January 2006, 09:00   #1
3dsnar
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NEW CODEC! 128 kbps and less for 5.1 surround encoding for MPEG4 (Xvid/Divx) movies

Dear All,

I am happy to annonce that we have
just finished a huge 5.1 surround sound
compression research project.


Software tools for encoding movies
with full 5.1 surround,
and
for real time decoding are available now.

www.aud-x.com
THE TECHNOLOGY IS FREE

I hope that you will
find it useful.
All comments are welcome :-)

Peace
3d
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Old 12th January 2006, 09:34   #2
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i don't believe this warrents crossposting. Your other threads have been removed, I will allow this one because it is simi-related to winamp, but you are border line spamming.
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Old 12th January 2006, 09:40   #3
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Well, this is related to Winamp in the way
that the DirectShow decoder is compatible with Winamp...
Therefore it could be of interest of Winamp users.
And we are not selling anything, because all the software tools are free...
Could you please put back the other posts?
(I can clearly stress that the DirectShow filter can be used with Winamp)
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Old 12th January 2006, 10:00   #4
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The other posts won't be put back, because it is cross-posting. You only need ONE thread, not multiple.

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Old 12th January 2006, 10:26   #5
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OK, thanx for not removing
this one at least
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Old 12th January 2006, 10:32   #6
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BTW. I wanted to add some details
Aud-X DirectShow decoder is
compatible with Winamp (for movies reproduction),
because Winamp can use external DS filters to decode
the audio stream.
On movies encoding, please visit our website
for help.
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Old 12th January 2006, 11:48   #7
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What's the difference between this and AC3 embedded in AVI?

Edit: And I take it the LAME/AC3Enc code that you use is just linked through a DLL?

Edit 2: Found the answer to my first question:
Quote:
The compression ratio is from 3 to 8 times larger than the compression ratio of the popular AC3 technology.
Edit 3: This does look interesting, yes. It's a pity the source is not being released - do you plan a Linux-compatible version of the codec?

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Old 12th January 2006, 11:54   #8
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Bitrate. This offers high quality 5.1 sound @ 128 kbps.
(AC3 normally has 384 or 448 kbps).
Also, there are other bitrate options available in Aud-X,
i.e. 192 kbps and even 80 kbps!
--
The format is fully compatible with AVI container
--
So now you can fit a complete 1.5 hour movie on one CD-R,
with 5.1 sound which uses the same space as normal stereo would (for 128 kbps).
--
What is important, when you decode the movie containing Aud-X stream, you can plug your home theatre system to your sound card (assuming it has SPDiF output), and enjoy full surround sound on all speakers (because the decoded Aud-X stream is transcoded to AC3, if you chose so)
If you have further questions, I will be happy to answer
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Old 12th January 2006, 11:55   #9
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I added some extra questions to my first post without realising you'd replied, sorry!

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Old 12th January 2006, 11:59   #10
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No problem.
Actually, there are alot of things to explain.
We provided a complete guides on how to encode and decode movies with Aud-X stream.
This is very simple! And the technology is completely FREE.
Please check www.aud-x.com
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Old 12th January 2006, 12:03   #11
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We did not modify LAME code, because the spatial coding
used in Aud-X is a separate thing. Please refer to our whitepaper:
http://www.aud-x.com/images/stories/...whitepaper.pdf
We are planning to release the source code, or at list libraries for Windows and Linux (sorry I do not konw, since I am not the decision maker).
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Old 12th January 2006, 13:37   #12
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Fair enough, it's just that your site said that you weren't releasing source (but you were releasing libraries/SDKs, which is at least ok...) and also that you were "using LAME code", rather than the library. If you didn't modify it you're well-sorted.

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Old 12th January 2006, 14:09   #13
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Quote:
Originally posted by zootm
Fair enough, it's just that your site said that you weren't releasing source (but you were releasing libraries/SDKs, which is at least ok...) and also that you were "using LAME code", rather than the library. If you didn't modify it you're well-sorted.
Reasonable suggestion. Thanx!
I will make sure that it will be clearly stated, on our web site that we did not modify LAME.
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Old 14th January 2006, 06:51   #14
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Some encoding details, for those who are into audio encoding:
The core bitrates that we use
1) STRQ 80 kbps -> base mp3 is 56 kbps mono (24 kbps for spatial info)
2) STDQ 128 kbps -> base mp3 is 64 kbps mono (64 kbps for spatial info)
3) HGHQ 192 kbps -> base mp3 is 128 kbps stereo (64 kbps for spatial info)
4) SPBQ 192 kbps -> base mp3 is mono 64 kbps (128 kbps for spatial info)
---------------------------------------------------------------------
So from above you can see that in fact SPBQ has no better base sound quality than STDQ. We decided that 64 kbps LAME 3.96.1 is good enough, and the rest of kbps should be used to recreate the 5.1 panorama and spatial feeling. This and only this was an objective of all the research that we carried out. Improving base psychoacoustic encoder was beyond the scope of our work (any did not modify LAME at all)

The emphasis was put on the recreation of phase relations (i.e. spatial feeling). Please
check out our whitepaper to see how SPBQ performs (in terms of phase and energy error) with reference to AC3 192 kbps and mp3surround 192 kbps.
http://www.aud-x.com/images/stories/...whitepaper.pdf
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Old 16th January 2006, 09:44   #15
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Just a short info.
We have modified Aud-X DirectShow filter.
So now when you use other filters, such as FFDshow audio
or AC3Filter, there will be no conflict.
The new version is available from www.aud-x.com
Have fun!
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Old 17th January 2006, 11:06   #16
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Now a completely new installation file is available on:
www.aud-x.com
----
All instalation problems should not occur anymore
(i.e. for those who had: LoadLibrary ("audxdshow.ax") failed...)
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Old 18th January 2006, 08:00   #17
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FYI: We just received
Certification for no spyware, adware & viruses.
See the Certificate at http://www.softpedia.com/progClean/a...ean-32242.html
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Old 22nd January 2006, 09:39   #18
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VirtualDubMod_Aud-X_enabled

Source code, as well as the executable version
are now available from our site (www.aud-x.com).

To download the source code or the complete VisualStudio project,
please go to the programmers section.

Thank you.
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Old 30th January 2006, 10:57   #19
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The newest version of our codec (1.1) for HGHQ encoding option
is mp3 backwards compatible. The mp3 stereofile is now downmixed with
accordance to DPLII matrix, thus when reproduced by ProLogicII decoder
should result in multichannel signal.

---

When reproduced with Aud-X decoder, Aud-X algorithms are used
to reconstruct the complete 5.1 panorama.

----

To download it, please visit
www.aud-x.com

----

Thanks to Doom9 users for all valuable suggestions and comments,
which resulted in these modifications.
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