Concatenating video files

For video files that come in part, use ffmpeg to merge them into 1 file

Eg: part1.mp4, part2.mp4, part3.mp4

Create a concat file - list.txt

file 'part1.mp4'
file 'part2.mp4'
file 'part3.mp4'

Use ffmpeg to merge into full.mp4

ffmpeg -f contact -safe 0 -i list.txt -c copy full.mp4

If you have subtitles create an additional concat file - subts.txt

file 'part1.mp4.srt'
file 'part2.mp4.srt'
file 'part3.mp4.srt'

Then use ffmpeg to create the full file

ffmpeg -f concat -safe 0 -i list.txt -f concat -safe 0 -i subs.txt -map 0 -map 1 -c copy -metadata:s:s language=eng -metadata:s:s title=English full.mp4

The title= seems to be necessary when doing subtitles and it names the subtitle track.