[Ffmpeg-devel] Re: BUG: AC3 encode volume is low

matthieu castet castet.matthieu
Sat Apr 8 18:13:14 CEST 2006


Justin Ruggles wrote:
>>i dont think this is true
>>and as the patch is based on apparently wrong assumtations its rejected
> Okay.  You're right again :)  I didn't notice before that CMUL can
> result in +/-65532. Hmm. Now I am stumped. The MDCT test function shows
> that the fixed-point MDCT implementation matches the spec with very
> little error. I'll delve a bit deeper to see if this is really a bug. It
> sure would be nice to have a reference encoder for these type things.
May be just have a original audio sample. Then encode it and decode it 
(not necessary with ffmpeg decoder) and compute the error between the 
original and the decoded one (using Benjamin rms calculator, ...)


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