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

[Paul B Mahol]

On Sun, Jun 1, 2025 at 6:23 PM Richard Bartczak via ffmpeg-user <
ffmpeg-user at ffmpeg.org> wrote:

> Am 01.06.25 um 17:48 schrieb 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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> >>
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> >>
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>
> On youtube you will find a lot of ac-3 files, e.g.:
>
> yt-dlp -F -o "%(title)s.%(ext)s"  -R infinite -N 4  --cookies
> cookies.txt  --no-playlist
> "
> https://www.youtube.com/watch?v=m1m7S3YVIP4&list=PLGI9nth6470EEmULYPzDn4rOiOmegfb9_&index=2&pp=iAQB
> "
>
> With  the parameter -F you will get the complete list of all stream IDs :
>
> 140     m4a   audio only      2 │   113.31MiB  129k https │ audio only
>          mp4a.40.2  129k 44k [de] medium, m4a_dash
> 251     webm  audio only      2 │   108.51MiB  124k https │ audio only
>          opus       124k 48k [de] medium, webm_dash
> 380     m4a   audio only      6 │   336.15MiB  384k https │ audio only
>          ac-3       384k 48k [de] high, m4a_dash
> 328     m4a   audio only      6 │   336.15MiB  384k https │ audio only
>          ec-3       384k 48k [de] high, m4a_dash
> 602     mp4   256x144     12    │ ~ 105.85MiB  121k m3u8  │
> vp09.00.10.08  121k video only
> 269     mp4   256x144     24    │ ~ 154.51MiB  177k m3u8  │ avc1.4D400C
>    177k video only
> 160     mp4   256x144     24    │    43.84MiB   50k https │ avc1.4d400c
>     50k video only          144p, mp4_dash
>
> with -f + ID you will get the file  :
>
> yt-dlp -f 380 -o "%(title)s.%(ext)s"  -R infinite -N 4  --cookies
> cookies.txt  --no-playlist
> "
> https://www.youtube.com/watch?v=m1m7S3YVIP4&list=PLGI9nth6470EEmULYPzDn4rOiOmegfb9_&index=2&pp=iAQB
> "
>
> yt-dlp refer to github
>
> Regards
>

I need exact files that Mark have.


>
> Richard
>
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