[FFmpeg-user] toggle between two audio streams

[Paul B Mahol]

On 4/25/17, Jon Beyer <jbeyer at gmail.com> wrote:
> I'd like to be able to replace the audio with constant tones for certain
> intervals of a video.  As an example, I might have a thirty second video,
> and want to insert 440 Hz from 5 seconds to 10 seconds and again from 15 to
> 20 seconds.  Assume that I already have the 440 Hz tone in a .wav file that
> is five seconds long.  Is there a way to specify a filter that toggles
> between the video's audio stream and the .wav file over the specified
> intervals (i.e. 5-10s and 15-20s)?

Via commands with (a)streamselect filters.

>
> Thanks in advance!
>
> Cheers,
> Jon
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