Welcome to Doom9's Forum, THE in-place to be for everyone interested in DVD conversion.

Before you start posting please read the forum rules. By posting to this forum you agree to abide by the rules.

 

Go Back   Doom9's Forum > General > Audio encoding

 
 
Thread Tools Search this Thread Display Modes
Prev Previous Post   Next Post Next
Old 2nd July 2006, 18:16   #1  |  Link
Kurtnoise
Swallowed in the Sea
 
Kurtnoise's Avatar
 
Join Date: Oct 2002
Location: Aix-en-Provence, France
Posts: 5,182
Aften 0.0.8 is out

Just found this at HA.org...and it sounds promizing.

Quote:
Aften is a simple, open-source, A/52 (AC-3) audio encoder.

The name, Aften, is an acronym for:
A / Fifty-Two ENcoder
It is also Danish and Norwegian for 'evening'.

This program started as a simple cutting-out of the AC3 encoder from FFmpeg, but then I reworked the structure of the encoder a bit. Most of the basic code is still the same though. Here are some of the things I've changed so far.

* Implemented my own wav reader and bitwise file writer
* Converted the fixed-point algorithms to floating-point
* Rearranged the methods and structures
* Added stereo rematrixing (mid/side)
* Added short block MDCT and block switching
* Added VBR encoding mode

Future Plans

* Variable bandwidth
* Channel coupling

Changelog of the last release:
Quote:
* fixed piped input from FFmpeg
* added support for MPEG channel order remapping
* restructured audio input. enables raw pcm file support.
* bugfixes in MMX/SSE2 code
* stack align hack for x86 MinGW with threads
* API changes
* SIMD and threads usage is shown and is configurable
* screen output gets updated every 200ms to reduce load
* SIMD detection changed to compiler-independent inline assembly, thus nasm/yasm not needed anymore
So, I've made a compile for win32 OS and I added pipeline & 2 switches for CBR and VBR Mode. Could be great if somebody can test multichannel encoding also.
  • Command Line example for VBR :
    Code:
    aften -q 300 input.wav output.ac3
  • Command Line example for CBR :
    Code:
    aften -b 256 input.wav output.ac3
  • Command Line example with pipeline :
    Code:
    aften -q 320 - output.ac3

Last edited by Kurtnoise; 10th September 2007 at 08:41.
Kurtnoise is offline   Reply With Quote
 

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT +1. The time now is 14:11.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2017, vBulletin Solutions Inc.