How to add a fade in within overlay with FFMPEG ? -

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i'm wondering how add option "fade in" in -filter_complex 'overlay'.

the basic overlay

ffmpeg -i movie.mp4 -i image.jpg -c:v libx264 -filter_complex 'overlay=x=main_w-overlay_w-100:y=main_h-overlay_h-100' output.mp4

does image.jpg fade=in should in filter_complex ?

ffmpeg -i movie.mp4 -i image.jpg -c:v libx264 -filter_complex 'fade=in:st=0:d=5:alpha=1, overlay=x=main_w-overlay_w-100:y=main_h-overlay_h-100' output.mp4

thanks lot on construction of -filter_complex parameter !

use

ffmpeg -i movie.mp4 -loop 1 -i image.jpg -filter_complex       "[1]format=yuva420p,fade=in:st=0:d=5:alpha=1[i];        [0][i]overlay=w-w-100:h-h-100:shortest=1" -c:v libx264 output.mp4

your fade filter set operate on alpha channel, jpegs don't have alpha, image needs converted pixel format does. also, ffmpeg time-based processor of streams , single image treated 1 frame @ 25 fps, lasting 0.04 s, added loop generate video stream out of it, needed fade take effect.

the overlay filter takes in 2 inputs, assigned pads explicit routing. since image looped indefinitely, shortest added stop overlay when main video ends.


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