I have some clips from a Dropcam, and I'm trying to improve the audio to make some soft human speech discernible.
The speech is quite soft and fuzzy sounding, as the speakers are away from the camera (and it's a Dropcam as well, so I'm guessing the audio quality isn't superb, plus it's AAC encoded)
The audio is mostly human voices, no music - and the important thing is to make what is being said discernible - so I'm OK if it affects the timbre. It's a quiet environment, and there should be little background noise - the voices are just very soft/fuzzy.
I tried using mpv, and the -softvol flag (going up to around 400%) and the voices become quite artificial and hard to make out at times. And there's a hiss, not sure why (I thought there wasn't much in the background, but maybe I'm wrong).
Are there any tools or techniques that you would recommend to boost the volume, and improve the understandability of the voices and remain somewhat natural?
I've provided a AAC sample here (there are ones which are even software as well), in case that makes it clearer: