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Amplify - Avisynth wiki
http://avisynth.nl/index.php/Amplify
Multiply (scale) the audio by amount; values are in dB : amount > 0.0 increases volume amount < 0.0 decreases volume amount = 0.0 retains the same volume (default) The relation between linear and decibel gain control is: lin = 10 (dB/20) dB = 20·log 10 (lin) For example, AmplifyDB( 0.0) is equivalent to Amplify(1.0) (no change)
Using avisynth's 'amplify' function - VideoHelp Forum
https://forum.videohelp.com/threads/378554-Using-avisynth-s-amplify-function
Amplify() works exactly as it's supposed to. Values between 0 and 1.0 decrease the volume, values over 1.0 increase the volume. Values below zero invert the waveform but otherwise work the same as the positive values. If you're not getting that it's because your editor isn't using the audio from AviSynth.
Increase Audio Volume Online - Totally Free
https://audiotoolset.com/increase-volume
The solution to this problem can be a software increase in the volume of the audio file itself and further saving for playback at an already increased volume. If you need to increase the volume of the entire song, then click on the button with the speaker image, use the slider to select the percentage by which you want to increase the volume ...
Converting AC3 5.1 to stereo with volume adjusting ...
https://forum.doom9.org/archive/index.php/t-177350.html
If you use LAV Audio decoder then you can enable its mixing feature. Set the mixing target to Stereo, you can control the levels for the center channel, surround channels and LFE. The other option I use all the time lets AviSynth do the work. Use this function: (by Tebasuna) Function Dmix6Stereo(clip a) {flr = GetChannel(a, 1, 2)
Volume Changer - Increase or decrease loudness online
https://mp3cut.net/change-volume
Volume Changer app allows you to increase video volume online without losing original quality. This free online volume changer works with all audio file formats (including mp3, m4a, wav, m4r, and flac). It also works as an audio converter by letting you save files in any desirable format.
Add Some Volume to Audio Tracks Via Avisynth Script ...
http://www.digitalfaq.com/archives/avisynth/14592-add-volume-audio.html
I don't know about audio managemetn in avisynth as it is mostly a frame server (dedicated to image so). But your question suggest that you are encoding audio directly with the tool that encodes also the video. What is it ? It should have a "normalize" feature too.
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