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New Standard: USAC, sussesor of (HE)-AAC
IgorC
post Sep 16 2011, 06:09
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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.
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smok3
post Oct 14 2011, 20:51
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QUOTE
your Linux distributor of choice licenses a HE-AAC (or USAC) decoder library (i.e. pays for it), and bundles it with Linux so that every software can access that decoder to play encoded files. Would that solve the problem?


there are serious issues with that:

- the library as binary or sources?
- to pay for a library it would not be in real OS spirit (although i imagine that certain mainstream distros would do it)

the clash is mostly due to the fact that there is real world outside, so basically linux users would want to use their other hardware (ipods?) to play the same files...., otherwise webm would most likely be already adopted (i think google still bundels chrome with h.264 decoder...).

p.s. so the idea is to make "use open media" sentence romantic.

This post has been edited by smok3: Oct 14 2011, 20:55


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Garf
post Oct 15 2011, 15:22
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QUOTE (smok3 @ Oct 14 2011, 21:51) *
- to pay for a library it would not be in real OS spirit (although i imagine that certain mainstream distros would do it)


Paying for open source/free software is perfectly fine, often done, expressly allowed by the licenses and encouraged by the FSF, so it most certainly is not against the "real OS spirit", whatever you claim that to be.

The problem is that a patent license does not carry over its rights to a third party, and *that* will run afoul of the GPL.

QUOTE
the clash is mostly due to the fact that there is real world outside, so basically linux users would want to use their other hardware (ipods?) to play the same files...., otherwise webm would most likely be already adopted (i think google still bundels chrome with h.264 decoder...).


Yeah, Google is a bunch of hypocrites in that area. Note that the open-source version of the browser (that nobody actually uses) doesn't include H.264 for obvious reasons.
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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


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