Am 22.01.2023 um 16:56 schrieb Michael Koch:
Am 22.01.2023 um 16:25 schrieb Paul B Mahol:
On 1/22/23, Michael Koch <astroelectro...@t-online.de> wrote:
Am 21.01.2023 um 17:05 schrieb Paul B Mahol:
On 1/19/23, Michael Koch <astroelectro...@t-online.de> wrote:
Am 19.01.2023 um 15:49 schrieb Alexander Bieliaev via ffmpeg-user:
How can I replace a part of the audio from and to a specific time
with
some
other audio/sound (I want to replace it with beep in this case)?
Here is an example:
ffmpeg -lavfi sine=500:d=10 -y audio1.wav
ffmpeg -lavfi sine=2000:d=10 -y audio2.wav
ffmpeg -i audio1.wav -i audio2.wav -lavfi
[0]volume='1-between(t,4,6)':eval=frame[a];[1]volume='between(t,4,6)':eval=frame[b];[a][b]amix
-y out.wav
That is never going to give smooth transitions.
Also overly complicated as can be simplified with commands to to amix
filter.
If my example is too complicated, then please show a simpler example.
asendcmd=10.0 amix weights 'X Y',
X/Y being wanted volume of first/second input to amix filter.
That doesn't work because the argument of asendcmd must be
encapsulated in quotes (because it contains spaces), and X Y must also
be encapsulated in quotes. Please show the whole command line.
This command line works with asendcmd and astreamselect:
ffmpeg -i audio1.wav -i audio2.wav -lavfi asendcmd="4 astreamselect map
1",asendcmd="6 astreamselect map 0",astreamselect=map=0 -y out.wav
However with amix filter I have no idea what's the syntax for the string
inside the string. It doesn't work.
ffmpeg -i audio1.wav -i audio2.wav -lavfi asendcmd="4 amix weights '0
1'",amix=weights='1 0' -y out.wav
Michael
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