[FFmpeg-user] Replace part of the audio

Michael Koch astroelectronic at t-online.de
Sun Jan 22 17:56:02 EET 2023

Am 22.01.2023 um 16:25 schrieb Paul B Mahol:
> 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.

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.


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