[FFmpeg-user] Question) Any way to change alpha for overlay while time goes by?

[Paul B Mahol]

On Mon, Jun 3, 2024 at 8:23 AM Lee Mitchell <npdmailing at gmail.com> wrote:

> Hi.
>
> There are RGBA support qtrle video clips that have no problem with alpha
> support.
>
> I'd like to overlay a video on top of base one, and want to change the
> transparency while playing
> like
> "[1:v]alpha='if(between(t,0,10),(1-(t/10)) *
> alpha(X,Y),0)'[v0];[v0]overlay[out]"
> What kind of filter sequence should I use?
>

The one that is really very fast and does not waste resources.


> Thank you in advance.
> Mitchell
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