On 01/06/2025 15.38, Paul B Mahol wrote:
On Sun, Jun 1, 2025 at 7:37 PM Mark Filipak <markfilipak.i...@gmail.com>
wrote:
On 01/06/2025 14.26, Paul B Mahol wrote:
Am 01.06.25 um 17:48 schrieb Paul B Mahol:
On Sun, Jun 1, 2025 at 3:40 PM Mark Filipak <
markfilipak.i...@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.
I need exact files that Mark have.
Why, Paul? This isn't troubleshooting. It's how-to.
I need to do this:
1) 'voices' = mix('voices+noise',invert('noise')). 'voices+noise' is an
existing ac3. 'noise' is
another ac3 that is identical but without voices. 'amix' is a mixer, but
is it the best mixer? More
important: I don't know of any audio filter that will invert().
followed by this:
2) output = mix('audio','voices'). 'audio' is an existing ac3.
How many audio channels every file have?
It's stereo ac3, 192kbpx. Do you need the files to run experiments?
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