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What kind of audio? ac3, mp2,wav?
You could demultiplex the audio from the mpg using batchdemux and then normalize / boost the audio , if ac3 use https://forum.videohelp.com/topic317891.html , and then multiplex the new audio back to the mpg using imagompegmuxer.
Or maybe womble mpeg video wizard or mpeg-vcr has a normalize function...