Join multiple GoPro MP4 files to single one

GoPro 'chapters' are footage around 4 GB - The camera starts a new file every ~ 10 minutes. If you have media files with exactly the same codec and codec parameters you can concatenate them quite easily. Fastest way, that I found, is use ffmpeg with concating function, but there is one unnecessary step with mylist.txt, the list of all files, you want to have concatenated.

for f in *.MP4; do echo "file '$PWD/$f'"; done > mylist.txt

If your shell supports process substitution (like Bash and Zsh), you can avoid explicitly creating a list file and do the whole thing in a single line:

ffmpeg -f concat -safe 0 -i <(for f in *.MP4; do echo "file '$PWD/$f'"; done) -c copy output.mp4

Here is also nice bash function, that can be put to your .bash_profile:

function video-concat() {
  ffmpeg -f concat -safe 0 -i <(for f in ${@:1:${#}-1}; do echo "file '$PWD/$f'"; done) -c copy $_

Then you can call video-concat function as follow:

video-concat *.MP4 output.mp3