change AC3 volume?

[shun]

what's an easy and free way to do this?

[redwudz]

AC3 Normalizer is one option.

[shun]

AC3 Normalizer works but the bitrate is limited to 384kbps. How do you get full 640kbps?

By the way, I noticed that the application uses the following Avisynth script:

SetMemoryMax(768) 
LoadPlugin("bassAudio.dll") 
LoadPlugin("AudioLimiter.dll") 
BassAudioSource("audio.ac3").normalize(0.98)

Also part of its internal script uses this:

for %%a in ("*.avs") do wavi "%%a" - | aften.exe -v 0 -b 384 -readtoeof 1 - "Normalized-%%~na_1.5.ac3"

[freebird73717]

Do it the manual way as described in soopafresh's thread which is what doctorjellybean based his ac3normalizer gui off of.
http://forum.videohelp.com/topic317891.html

Download the zip in soopa's first post, follow his instructions. Open the "Run_AC3gain.bat" file in notepad and change the -b 384 to -b 640
Save the file then double click it.

[Soopafresh]

Do it the manual way as described in soopafresh's thread which is what doctorjellybean based his ac3normalizer gui off of.
http://forum.videohelp.com/topic317891.html

Download the zip in soopa's first post, follow his instructions. Open the "Run_AC3gain.bat" file in notepad and change the -b 384 to -b 640
Save the file then double click it.

I can't recall if Aften has 640K bitrate, but it might. Give it a try and if 640 doesn't work, try 448. I've never seen a commercial DVD with AC3 audio over 448. DTS is a completely different story, however.

[johns0]

Avchd and blu-ray use 640kbps ac3,only 448 max for dvd.Aften will encode to 640k.