Hi
>However, the following places a logo on a video: >$ ffmpeg -i video -loop 1 -i logo -filter_complex >overlay -qscale 2 out.avi > The command does place a logo on a video. But there is no transparent effect, and I can't the image of vidoe behind the logo. The basic theory is easy: alpha is used to control the weight of pixel to display in video and logo. The formula is shown below: final pixel = alpha * video pixel + (1 - alpha) * logo pixel. But how to make transparent effect by ffmpeg? At 2015-06-25 18:01:01, "Carl Eugen Hoyos" <[email protected]> wrote: >qw <applemax82 <at> 163.com> writes: > >> I place a logo image on a video, and overlayed video >> should have transparent effect. What's the ffmpeg >> command to create this kind of video? > >Generally, you are expected here to provide the command >line that you tried together with the complete, uncut >console output and an explanation what went wrong. > >However, the following places a logo on a video: >$ ffmpeg -i video -loop 1 -i logo -filter_complex >overlay -qscale 2 out.avi > >Carl Eugen > >_______________________________________________ >ffmpeg-user mailing list >[email protected] >http://ffmpeg.org/mailman/listinfo/ffmpeg-user _______________________________________________ ffmpeg-user mailing list [email protected] http://ffmpeg.org/mailman/listinfo/ffmpeg-user
