As seen on ma.ttias.be. I’m just documenting this in my own way for future reference. This method is only applicable to videos of the same dimensions and encoding. Tested on FFmpeg 4.3. I use this method to download and concatenate
Step 1: Create a text file and make a list of video files.
touch files.txt vi files.txt
Example content to save:
file 'p1.mp4' file 'p2.mp4' file 'p3.mp4' file 'p4.mp4'
Step 2: Run the command below
ffmpeg -f concat -safe 0 -i files.txt -c copy output.mp4