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

[Mark Filipak]

On 01/06/2025 11.48, Paul B Mahol wrote:
> 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.

Yes, I have actual files. They're '*.ac3'.