[FFmpeg-user] isolate 'voices', move them, and mix into another audio stream

[Paul B Mahol]

On Sun, Jun 1, 2025 at 3:40 PM Mark Filipak <markfilipak.imdb at gmail.com>
wrote:

> I have two ac3 audio streams. One is 'voices+noise', the other is just
> 'noise' -- no voices. I want
> to take 'voices+noise', remove 'noise' leaving just 'voices', then mix
> 'voices' into a latter,
> clipped version, call it 'sounds'. I could do it with Audacity, but I'd
> like to do it with FFmpeg,
> if possible.
>
> I seek experienced guidance because I've never done this before and I want
> to use the best audio
> mixer 'filter' available -- knowing what's best comes only via experience.
>
> The full story:
>
> "2001, A SPACE ODYSSEY" has a tedious, 2:58.136 prelude that is just
> 'noise', after which the MGM
> Lion appears. When I made an mp4, I cut 'm2ts 0..178.136' out leaving just
> 'm2ts 178.136...', which
> is now 'mp4 0...', which begins with the MGM Lion.
>
> When I finished, I discovered that in their comments track, Keir Dullea
> and Gary Lockwood introduce
> themselves during that 'noise'. Their 'voices' spans 'm2ts 0..34.034'.
>
> I want to take 'm2ts 0..34.034', remove the 'noise' so that only 'voices'
> is left, then mix 'voices'
> into 'mp4 0..34.034', over the MGM Lion. There's a little more clipping
> and joining to be done but I
> can handle that.
>

Need actual files.


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