[FFmpeg-user] how to blend logo and video with transparent effect

[qw]

Hi,

I use the below command to blend logo image and video together with transparent effect:
ffmpeg -i ./file1.mp4 -i ./logo.jpg -filter_complex blend=all_mode=overlay ./file3.mp4



But the command requires the same resolution from logo image and video. If the size of logo image is different from or smaller than that of video, the command will report error.


How to blend image and video with different size? Could you provide some command examples?
Thanks!


B.R.


Andrew