How to merge 485 MP4 files from a recorder (66gb)?

Question

linux

Hello!
I copied 485 files in MP4 format from the DVR, the total volume is 66 GB. There is a desire to glue all the files into 1 video, and then speed it up so that it fits in 5-7 minutes.
Of the operating systems available macOS or Linux
How to be?

Answer 1

ffmpeg in batch mode.
Google knows what you need

Answer 2

avisynth script. you can immediately glue and speed up, leaving every N frame. And you can debug with previews without the need to process all the videos.
There is AvsP on Windows, I don't know about Linux