[FFmpeg-user] Replace part of the audio

[Paul B Mahol]

On 2/1/23, Alexander Bieliaev via ffmpeg-user <ffmpeg-user at ffmpeg.org> wrote:
> Thanks, it kinda worked for me, but it seems like it's dependent on the
> length of the inserted audio. For example if I have a 2 minute audio and
> try to replace some parts of it with audio that is 1 minute long, for the
> first minute of the audio it works fine but if I try to replace parts above
> 1 minute it doesn't work. I guess it's because it tries to pick parts of
> the audio above 1 minute, but it doesn't exist, because the audio is only 1
> minute long. How can I replace any part of the audio with another audio
> that starts playing from the beginning?

There is no simple way.

I wanted to write special filter for this, but lost motivation.


>
> On Mon, Jan 23, 2023 at 10:26 AM Michael Koch <astroelectronic at t-online.de>
> wrote:
>
>> Am 22.01.2023 um 23:52 schrieb Reino Wijnsma:
>> > Hello Michael,
>> >
>> > On 2023-01-22T18:50:20+0100, Michael Koch <astroelectronic at t-online.de>
>> wrote:
>> >> 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
>> > You've got your quotes all wrong. Always surround the complete
>> filter-chain with double quotes and use single quotes for the individual
>> filters.
>> >
>> > ffmpeg -i audio1.wav -i audio2.wav -lavfi "asendcmd='4 astreamselect map
>> 1',asendcmd='6 astreamselect map 0',astreamselect=map=0" -y out.wav
>> >
>> > ffmpeg -i audio1.wav -i audio2.wav -lavfi "asendcmd='4 amix weights
>> '\\\'0 1\\\',amix=weights='1 0'" -y out.wav
>>
>> Thank you!
>>
>> Michael
>>
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>
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