On Sun, Jun 1, 2025 at 7:42 PM Mark Filipak <markfilipak.i...@gmail.com> wrote:
> 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? > And why do you think noise is exactly same as in another file? You can mix audios with amix filter. And you can change weights to -1 in amix too with special option. See documentation of amix filter. So something like: ffmpeg -i voice.ac3 -i noise.ac3 -lavfi "amix=weights=1 -1" out.wav But I really doubt you will accomplish anything with that. > > > _______________________________________________ > ffmpeg-user mailing list > ffmpeg-user@ffmpeg.org > https://ffmpeg.org/mailman/listinfo/ffmpeg-user > > To unsubscribe, visit link above, or email > ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe". > _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".