[Ffmpeg-devel] ac3 encoder

Benjamin Larsson banan
Tue Apr 19 09:06:26 CEST 2005


Justin Ruggles wrote:

> I've been playing around with the AC3 encoder in ffmpeg hoping to make 
> some improvements.  Right now I've added stereo matrixing for 
> 2-channel audio, and I've been experimenting with some different 
> exponent strategy algorithms.  I've made an attempt at block 
> switching, but can't figure out how to get the short-block mdct to 
> work with fft, so right now it's extremely slow doing it the O(n^2) 
> way.  I have plans to try my luck at channel coupling as well.
Contact me in private or post some example code to the list and I might 
be able to help with the mdct code.

> [...]
> Thanks,
> -Justin
Benjamin Larsson

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