NEW Guides and AmvApp BETA

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Postby WC Annihilus » Fri Oct 19, 2007 5:29 pm

Guide wrote:Because of the license this software is released under, the encoder could not be directly included in the AMVApp

You are able to get it from here though
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Postby Scintilla » Fri Oct 19, 2007 7:03 pm

What, Nero's AAC encoder isn't available as a free download anymore?
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Postby WC Annihilus » Fri Oct 19, 2007 7:15 pm

Basically Nero adjusted their site with Nero 8 and the link now re-routes to Nero Digital. However, Google still has the original page cached, so you can get it there (link in my previous post)
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Postby Zarxrax » Fri Oct 19, 2007 7:23 pm

Hmm, ill have to work something out about that.
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nice typo

Postby Tiiscool » Sat Oct 20, 2007 3:08 am

Hi,

a little nice typo: XviD is became Xvid :wink:

Ti
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Postby Kira_Douji » Sat Oct 20, 2007 5:47 pm

Well thank you for the cached page - I have it now. I guess what I don't understand is why Nero offers it for free but apparently only Nero can offer it? Weird.

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Postby Qyot27 » Sat Oct 27, 2007 2:41 pm

Concerning the Nero AAC issue:
http://forum.doom9.org/showthread.php?t=130832

So maybe things will get straightened out, but there's no telling when.
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Postby Qyot27 » Tue Oct 30, 2007 6:24 pm

Qyot27 wrote:Concerning the Nero AAC issue:
http://forum.doom9.org/showthread.php?t=130832

So maybe things will get straightened out, but there's no telling when.

It's now back up at this address:
http://www.nero.com/eng/nero-aac-codec.html
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Postby Qyot27 » Sun Nov 18, 2007 7:32 pm

I think it would be advisable to explain some of the differences when encoding AAC streams. Particularly because of the fact that the High Efficiency profile (HE-AAC) isn't meant to be used with high bitrates, like videos distributed locally would aim for most of the time, and yet I'm seeing it getting used anyway. The default Low Complexity profile should be used instead for bitrates that aren't intentionally low, like the case would be for streaming (i.e. under 80 kbps, as that's about the cutoff for HE-AAC's usefulness with normal audio streams).

The reason is that, unless the encoder is wonky, HE-AAC achieves the quality it does by halving the frequency so that the low bitrate doesn't negatively affect things, and uses SBR to attempt to restore the lost frequencies. It can't perfectly replicate the lost data, though, and using LC at higher bitrates close to transparency (which are the bitrates I'm seeing used as it is) does a better job at preserving the audio quality, as it doesn't toss out the frequency information.

Videos I've downloaded that actually used HE-AAC correctly had very audible degradation of the sound quality, although it did certainly sound better than the bitrate that was used (mainly 64 kbps) would have sounded otherwise. However, there's truckloads of them which superficially report the use of HE-AAC but CoreAAC reports no transformation of the frequency, and the files really are still 44.1 or 48 kHz, which means that the High Efficiency hinting isn't there and the report is a false positive, or isn't doing anything if it is there.

Also it might help to reiterate the fact that iTunes Plus purchases can be converted without needing to be decrypted first. Even if it is redundant and completely obvious, it is worth noting (especially since the Plus versions are also higher bitrate than typical Store purchases).
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Postby Zarxrax » Mon Nov 19, 2007 3:17 pm

As far as the guide goes, aac encoding is explained through the use of my zarx264gui, which does not give you an option to use he-aac or not (its selected automatically by the encoder, and as long as you use a decent bitrate it should come out fine).

Granted, some people may be working with other tools, in which case this might be worth mentioning... but at the same time I don't really know if it's that necessary. There would have to be a new section added in which to explain this at, and there doesn't exist anything explaining what all of the options in LAME do, so I'm kind of inclined to lean towards thinking that if people are using something other than what I include in the amvapp, they should research all such options on their own.

Anyone else want to weigh in on this?
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Postby Gepetto » Mon Nov 19, 2007 4:44 pm

Zarxrax wrote:Anyone else want to weigh in on this?


I agree. If someone has a reason to prefer another application, they should know what it is, and therefore not need explanations about it.
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Postby post-it » Mon Nov 19, 2007 6:14 pm

.. ok .. dumb question time ^______________^ .. can this encoder handle 24 & 32 bit wav forms ?? the Encoders that are Demo's always convert it to 16 bit and destroy the multi-channel encodes and just make them Pro-Logic Garbage T_T
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Postby post-it » Sat Dec 01, 2007 3:17 am

.. never mind by previous question; found the Source Code for 8 Channel AC_9, now I just need to re-write it so it will do what I need it to do _

THx 8-)
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Postby Zarxrax » Mon Jan 28, 2008 11:39 am

Just thought I'd give a heads up that I'm starting back to work on this stuff again. I'm going to go through this whole thread and make sure that any issues that have been raised are cleared up, and I'm probably going to make some significant changes to a couple sections of the guide. I'm also toying around with the idea of rewriting the amvapp installer from scratch, to address a few problems that I have with it. I also plan to make sure that everything in the amvapp will be compatible with all versions of Windows since Windows 2000.
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Postby jasper-isis » Mon Jan 28, 2008 11:45 am

Just saw this thread in my email notifications and was pleasantly surprised. All I have to say is... great! Thanks for all your hard work. :)
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