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Normalize an AC3 File! - VideoHelp Forum
https://forum.videohelp.com/threads/330630-Normalize-an-AC3-File!#:~:text=If%20so%2C%20you%20could%20use%20something%20like%20%22,and%20do%20a%20second%20pass%20normalising%20the%20ac3.
AC3 Normalizer 13/06/08 Free Download - VideoHelp
https://www.videohelp.com/software/AC3-Normalizer
AC3 Normalizer is a AC3 audio normalizer. How often did you had to turn up the volume of your DVD player to hear the audio of your DVD discs, which were created with AC3 files? This application addresses some of the volume issues with transcoded AC3 files.
Normalize AC3 Audio - VideoHelp Forum
https://forum.videohelp.com/threads/280122-Normalize-AC3-Audio
If you are playing on your computer/htpc then use ac3filter as ac3 decoder and boost the volume in the config->gain. You could also demux it and adjust the level of the audio. AC3Machine a frontend for BeSweet has an Auto Find Maximum Gain switch. It also has a manual gain db setting. Good luck.
How to determine and normalise AC3 volume? [Archive ...
https://forum.doom9.org/archive/index.php/t-153968.html
If you want to transcode the audio to another format like AAC, then eac3to can normalize very nicely. eac3to input.ac3 output.m4a -normalize If you want to do this to existing AC3s without transcoding there are a few options 1) Do it on playback with AC3Filter or FFDShow's audio processing filters.
Computer topics: Normalize ac3 in MKV container
https://dickbos.blogspot.com/2015/01/normalize-ac3-in-mkv-container.html
1. In VirtualDub with mkv plugin and ac3 decoder extract ac3 audio stream as wav using full processing mode 2. In VirtualDub extract video as avi using direct stream copy 3. In Audacity load wav file and normalize it 4. In Audacity with FFmpeg to new ac3 file 5. In MKVToolNix GUI merge video from step 2 and audio from step 4 to new mkv container 1.
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