change AC3 volume?

[shunx]

I tried AC3 Normalizer (http://doctorjellybean.googlepages.com/ac3normalizer) but it only supports up to 384kbps. Is there a way to get 640kbps with free tools?

[tebasuna51]

You don't need 640 Kb/s output after destroy the dynamic range and quality with the AudioLimiter filter or with the buggy decoder BassAudio v2.2

The ac3normalizer method is for low quality players and 384 Kb/s is enough.

[shunx]

how to preserve as much quality as possible then?

[tebasuna51]

Without recode, only cancel Dialog Normalization, maybe 4 dB high:
eac3to input.ac3 output.ac3

This recode the audio and guarantee the max gain without distort:
eac3to input.ac3 output.ac3 -normalize

If you want more volume, and lose some quality (but less than with Audiolimiter) you can decode with DRC an after Normalize.
You can use BeLight, MeGUI/Behappy

[shunx]

thanks, eac3to is a nice tool.