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.
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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
Richard
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