FFMpeg merge two videos?

Question

fmpeg

Actually how to merge two video files into one?
and then the question - is it possible to do this with two different files in terms of format and image size?

Answer 1

Depending on what you mean by merging:
1. You can create a file with two video tracks, similar to audio, but not all container formats can do this
2. You can merge files
For the second option, everything is simple:
https://trac.ffmpeg.org /wiki/Concatenate
In the case of different video parameters, here you need to look at the capabilities of the container. MPEG-TS allows this. But it can also be "glued" with a simple cat.