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Topic: Open Source Fraunhofer AAC Encoder (fdk-aac) (Read 189249 times) previous topic - next topic

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  • kokuyo
  • [*]
Re: Open Source Fraunhofer AAC Encoder (fdk-aac)
Reply #175
EZ CD Audio Converter just updated its FDK encoder (https://www.poikosoft.com/help/history):

- Codec Updates
- - FhG FDK AAC encoder 3.4.22p
- - - Improved audio quality
- - - Performance improvements for x64

Sorry nu774 for always calling you on updates, any news on this? Thanks man.

FhG FDK AAC encoder library 3.4.22p
https://www.iis.fraunhofer.de
"p" version stands for modified by Poikosoft audio laboratories.
Modifications to the original encoder are the following:
· Widened bandwidth for better audio quality
· Uses the highest quality options available in the original codec for better audio quality
· Double-precision algorithms for better audio quality
· Uses high precision math functions rather than limited precalculated tables for better audio quality
· Modified VBR tables for more VBR encoding modes
· Improved x64 performance by using faster math functions
· Uses MMX, SSE, SSE2, SSE3, SSSE3, SSE4.1, SSE4.2, AVX, and AVX2 multimedia instructions whenever there is a performance benefit

https://www.poikosoft.com/help/encoder-versions


  • nu774
  • [*][*][*][*][*]
  • Developer
Re: Open Source Fraunhofer AAC Encoder (fdk-aac)
Reply #176
"p" version stands for modified by Poikosoft audio laboratories.
Modifications to the original encoder are the following:
· Widened bandwidth for better audio quality
· Uses the highest quality options available in the original codec for better audio quality
· Double-precision algorithms for better audio quality
· Uses high precision math functions rather than limited precalculated tables for better audio quality
· Modified VBR tables for more VBR encoding modes
· Improved x64 performance by using faster math functions
· Uses MMX, SSE, SSE2, SSE3, SSSE3, SSE4.1, SSE4.2, AVX, and AVX2 multimedia instructions whenever there is a performance benefit

https://www.poikosoft.com/help/encoder-versions

Ah, thanks to let me know. So, they are using modified version of the encoder. Are they publishing the sources?

Re: Open Source Fraunhofer AAC Encoder (fdk-aac)
Reply #177
I just installed a demo of that program & after messing about with the FDK encoder at what is 160k. So far i would it rank with the other higher quality AAC encoders. I'm really surprised by this.  


  • eahm
  • [*][*][*][*][*]
Re: Open Source Fraunhofer AAC Encoder (fdk-aac)
Reply #178
So far i would it rank with the other higher quality AAC encoders. I'm really surprised by this.

Based on what? Did you ABX?

Re: Open Source Fraunhofer AAC Encoder (fdk-aac)
Reply #179
So far i would it rank with the other higher quality AAC encoders. I'm really surprised by this.

Based on what? Did you ABX?
I did some more tests, some ambient stuff had bit rates of 240 - 300k & one harsh noise track had a bit rate of 70k with a artifact. While another harsh noise album just breaks it with ugly artifacts even at 275k.

It's almost like they mostly ignored anything electronic music since there bit rates are all over the place at 160k VBR.
  • Last Edit: 12 February, 2017, 07:18:40 AM by doom-drone

  • kokuyo
  • [*]
Re: Open Source Fraunhofer AAC Encoder (fdk-aac)
Reply #180
FhG FDK AAC encoder library 3.4.22p3
https://www.iis.fraunhofer.de
"p" version stands for modified by Poikosoft audio laboratories.
Modifications to the original encoder are the following:
· Tuned bandwidths for better audio quality
· Uses the highest quality options available in the original codec for better audio quality
· Double-precision algorithms for better audio quality
· Uses high precision math functions rather than precalculated tables for better audio quality
· Modified VBR tables for more VBR encoding modes
· Improved x64 performance by using faster math functions
· Uses MMX, SSE, SSE2, SSE3, SSSE3, SSE4.1, SSE4.2, AVX, and AVX2 multimedia instructions whenever there is a performance benefit

https://www.poikosoft.com/help/encoder-versions

  • Enig123
  • [*][*][*]
Re: Open Source Fraunhofer AAC Encoder (fdk-aac)
Reply #181
First impression, better audio quality is not  guaranteed just by those changes.

  • LithosZA
  • [*][*][*]
Re: Open Source Fraunhofer AAC Encoder (fdk-aac)
Reply #182
We would only know by doing a listening test to determine if the changes hurt audio quality or give better audio quality.