On Fri, Jun 7, 2024 at 5:55 AM Lee Mitchell <npdmail...@gmail.com> wrote:
> Hi. > > What I know is alpha change for another video clip pon base video like as > "-filter_complex > "[1:v]geq=r='r(X,Y)':a='if(between(t,0,9),alpha(X,Y)*(T/9),0)'[alpha];" > which works very well as time goes by. > > But it is not working for a PNG image file as time goes by. It only sets > alpha when the overlay starts which does not change while playing. > How to change PNG alpha by base video clip's time? > Could you guys advise me or hint me on keywords? > If you do not -loop single PNG, I think it will always have same time/PTS. Use -loop 1 or loop video filter (faster processing, no need for decoding same image all the time) instead, that one will ensure that time/PTS always increases monotonically for that specific single PNG image. > > Thank you in advance. > _______________________________________________ > ffmpeg-user mailing list > ffmpeg-user@ffmpeg.org > https://ffmpeg.org/mailman/listinfo/ffmpeg-user > > To unsubscribe, visit link above, or email > ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe". > _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
