ffmpeg merge files into one

[cah]

16. Joining or merging multiple video parts into one
FFmpeg will also join the multiple video parts and create a single video file.

Create join.txt file that contains the exact paths of the files that you want to join. All files should be same format (same codec). The path name of all files should be mentioned one by one like below.

file /home/sk/myvideos/part1.mp4
file /home/sk/myvideos/part2.mp4
file /home/sk/myvideos/part3.mp4
file /home/sk/myvideos/part4.mp4
Now, join all files using command:

$ ffmpeg -f concat -i join.txt -c copy output.mp4
If you get an error something like below;

[concat @ 0x555fed174cc0] Unsafe file name '/path/to/mp4'
join.txt: Operation not permitted
Add “-safe 0”:

$ ffmpeg -f concat -safe 0 -i join.txt -c copy output.mp4
The above command will join part1.mp4, part2.mp4, part3.mp4, and part4.mp4 files into a single file called “output.mp4”.