There is automatic option which adjusts peak volume to -3 dB. And there is manual option which allows set custom gain value. This is what confuses me. I just cannot increase the level by random, I need to know the current max level. Do I have to extract the audio and analyze it with some other tool?
Nobody knows how to use this function?
In short, you basically want automatic mode for the normalize audio filter with customizable peak level (https://github.com/mean00/avidemux2/blob/master/avidemux/common/ADM_audioFilter/src/audiofilter_normalize.cpp#L142) (db_out), right?
QuoteDo I have to extract the audio and analyze it with some other tool?
Not necessarily. Select the automatic gain mode, save the source video with video in copy mode and audio set to codec of your choice (you don't need the resulting file) and search the log (admlog.txt on Windows, console output on Linux and Mac) for the string
[Normalize]GainAdd 3dB to the value shown and you get the max gain you can use without clipping.
However, audio filters are not on my radar at the moment.
Thanks for this workaround. :) I hope in future this feature will be improved.
I just saw this after I posted my own version of the question. Thanks for this log-checking tip. Will try it. But still wish for a configurable max gain amount.