How to use ffmpeg to overlay a picture in front of a video?

Question

fmpeg

There are two files video.mp4 and picture.png
I want a picture to be shown for 5 seconds and then a video

Answer 1

It is necessary to make a video from the picture exactly the same size, format and codec as the main video.
And combine them via concat .

Answer 2

Use the script utility AviSynth, there it will be in a couple of lines:
(well, maybe conjure a bit)
and then submit the script to ffmpeg

ffmpeg -i myscript.avs -c:v libx264 -crf 24 "result.mp4"