Using free software, e.g AVIdemux, it is possible to extract the audio from a video , tweak the audio in Audacity , then replace original audio on the video with the tweaked version , without transcoding the video, (which damages video quality ).
Using free software, e.g AVIdemux, it is possible to extract the audio from a video , tweak the audio in Audacity , then replace original audio on the video with the tweaked version , without transcoding the video, (which damages video quality ).