[FFmpeg-user] Replace part of the audio

Paul B Mahol onemda at gmail.com
Sun Jan 22 17:25:24 EET 2023

On 1/22/23, Michael Koch <astroelectronic at t-online.de> wrote:
> Am 21.01.2023 um 17:05 schrieb Paul B Mahol:
>> On 1/19/23, Michael Koch <astroelectronic at 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.

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