IPB

Welcome Guest ( Log In | Register )

New Standard: USAC, sussesor of (HE)-AAC
IgorC
post Sep 16 2011, 06:09
Post #1





Group: Members
Posts: 1506
Joined: 3-January 05
From: Argentina, Bs As
Member No.: 18803



It's a new standard (Unified Speech and Audio Coding USAC, aka MPEG-D part 3).
It has reached a status of Final Draft International Standard.

Basic information http://en.wikipedia.org/wiki/Unified_Speech_and_Audio_Coding
There are some papers about new compression schemes in internet.

There was a verification test where USAC was compared to HE-AAC v1/v2 on range of bitrates 8-96 kbps. http://mpeg.chiariglione.org/meetings/tori...orino_press.htm
The report should be available in September October.

Some anonymous source has indicated that USAC was clearly superior to HE-AAC and it did very good on speech though something like "USAC at 48 kpbs = HE-AAC at 64 kbps" shouldn't be expected. It's more like 20-25% of bitrate gain at 20-32 kbps and 10-12% at 64 kbps. That's still pretty good.

There is no information if USAC will be used at higher bitrates as ( LC-AAC's area). The core coder of USAC includes a new enhanced SBR (eSBR).
Both SBR and new eSBR have no advantage over LC-AAC at bitrates higher than 80 kbps. Its unclear if eSBR can be disabled at higher bitrates.


It will be interesting to hear opinions and if somebody knows something more about it.
Go to the top of the page
+Quote Post
 
Start new topic
Replies
IgorC
post Aug 3 2012, 17:02
Post #2





Group: Members
Posts: 1506
Joined: 3-January 05
From: Argentina, Bs As
Member No.: 18803



Maybe it's this particular encoder.

Because I have tried USAC files from official test and it was quite good. http://www.hydrogenaudio.org/forums/index....st&p=797609
Go to the top of the page
+Quote Post
C.R.Helmrich
post Aug 3 2012, 20:08
Post #3





Group: Developer
Posts: 681
Joined: 6-December 08
From: Erlangen Germany
Member No.: 64012



QUOTE (IgorC @ Aug 3 2012, 18:02) *
Because I have tried USAC files from official test and it was quite good. Is there any possibility that there will be a commercial encoder besides of reference implementation?

Those files from the USAC verification test were created with an unpublished reference quality encoder, not the reference software. I'm confident that an encoder similar to this reference quality encoder will be available for purchase in the near future.

QUOTE (Garf)
Will it stay mono or will that change? I could see the point in removing some parts of the good encoder so you can license a few copies of the true good encoder, but the stereo coding seems to be an important part of USAC, so leaving that out seems to undermine the point?

I know and agree, but don't know if/when it will be able to do stereo.

Chris


--------------------
If I don't reply to your reply, it means I agree with you.
Go to the top of the page
+Quote Post

Posts in this topic
- IgorC   New Standard: USAC   Sep 16 2011, 06:09
- - IgorC   USAC verification test report   Oct 12 2011, 19:57
- - C.R.Helmrich   Thanks for posting that link, Igor! I've a...   Oct 12 2011, 21:49
|- - IgorC   QUOTE (C.R.Helmrich @ Oct 12 2011, 17:49)...   Oct 13 2011, 02:53
- - FreaqyFrequency   Cool stuff! Always exciting to see the prospe...   Oct 13 2011, 01:53
|- - Speckmade   QUOTE (FreaqyFrequency @ Oct 13 2011, 02...   Jul 12 2012, 18:52
|- - Canar   QUOTE (Speckmade @ Jul 12 2012, 10:52) On...   Jul 12 2012, 19:00
- - polemon   For me, as a Linux user, developer of embedded sys...   Oct 13 2011, 15:34
|- - C.R.Helmrich   QUOTE (polemon @ Oct 13 2011, 16:34) I re...   Oct 13 2011, 20:40
|- - polemon   QUOTE (C.R.Helmrich) Well, (HE-)AAC is used in DAB...   Oct 13 2011, 22:23
||- - C.R.Helmrich   QUOTE (polemon @ Oct 13 2011, 23:23) The ...   Oct 14 2011, 20:35
||- - Garf   QUOTE (C.R.Helmrich @ Oct 14 2011, 21:35)...   Oct 15 2011, 15:15
|- - Garf   QUOTE (C.R.Helmrich @ Oct 13 2011, 21:40)...   Oct 14 2011, 07:04
|- - Speckmade   QUOTE (C.R.Helmrich @ Oct 13 2011, 21:40)...   Jul 12 2012, 21:11
|- - Garf   QUOTE (Speckmade @ Jul 12 2012, 22:11) Be...   Jul 12 2012, 22:16
- - FreaqyFrequency   @polemon, you're familiar with Opus, I assume?...   Oct 13 2011, 16:00
|- - polemon   Well, I don't want to be an evangelist of any ...   Oct 13 2011, 18:32
|- - IgorC   QUOTE (FreaqyFrequency @ Oct 13 2011, 12...   Oct 13 2011, 22:35
- - smok3   polemon, interesting, but if you wanna do it ...   Oct 13 2011, 19:35
- - hlloyge   Problem with Linux isn't finding encoders for ...   Oct 13 2011, 20:58
|- - C.R.Helmrich   Well, USAC is just that: a general purpose codec. ...   Oct 13 2011, 21:25
- - IgorC   Nice, It will be great to see an implementation ...   Oct 13 2011, 21:30
|- - ksuman   QUOTE (IgorC @ Oct 13 2011, 21:30) Nice, ...   May 16 2012, 06:26
- - smok3   QUOTE your Linux distributor of choice licenses a ...   Oct 14 2011, 20:51
|- - Garf   QUOTE (smok3 @ Oct 14 2011, 21:51) - to p...   Oct 15 2011, 15:22
- - smok3   i meant paying (or just allowing closed binaries) ...   Oct 15 2011, 19:58
- - IgorC   Reference software http://www.itscj.ipsj.or.jp/sc2...   Jun 3 2012, 17:55
|- - Garf   QUOTE (IgorC @ Jun 3 2012, 18:55) Referen...   Aug 3 2012, 16:07
|- - C.R.Helmrich   QUOTE (Garf @ Aug 3 2012, 17:07) In true ...   Aug 3 2012, 16:36
|- - Garf   QUOTE (C.R.Helmrich @ Aug 3 2012, 17:36) ...   Aug 3 2012, 17:04
|- - IgorC   QUOTE (C.R.Helmrich @ Aug 3 2012, 12:36) ...   Aug 3 2012, 17:30
- - pdq   I think you will find that no matter how many time...   Jul 12 2012, 19:13
- - benski   One thing that's curious about USAC. Much of ...   Jul 12 2012, 20:29
- - IgorC   Maybe it's this particular encoder. Because ...   Aug 3 2012, 17:02
|- - C.R.Helmrich   QUOTE (IgorC @ Aug 3 2012, 18:02) Because...   Aug 3 2012, 20:08
- - darkbyte   Is there any encoder/decoder available in binary f...   Oct 17 2013, 22:02


Reply to this topicStart new topic
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:

 



RSS Lo-Fi Version Time is now: 19th April 2014 - 16:44