What software to glue and compress a long video file?

Question

Video

There are 26 mkv files of 700Mb each - this is the result of exporting a segment of a weekly recording from a video surveillance system. It is required to glue these files in the correct order and then compress the glued file as much as possible without quality loss into avi, mp4 format - it doesn’t matter. At the same time, it is required to load the processor to the fullest, use all the resources to perform the work, and not so that one core is loaded by the task, and the rest are idle. The solution is looking for free or open source, OS - Windows. The first thing that comes to mind is ffmpeg, but what is the right way to use it, with what keys to use for my task?

Answer 1

virtualdub

Answer 2

https://trac.ffmpeg.org/wiki/Concatenate
mylist.txt

# this is a comment
file '/path/to/file1'
file '/path/to/file2'
file '/path/to/file3'

https://trac.ffmpeg.org/wiki/Encode/H.264
ffmpeg always tries to gobble up all cores and take care of free disk space