Info found here: https://superuser.com/questions/692990/use-ffmpeg-copy-codec-to-combine-ts-files-into-a-single-mp4

Find all the .ts files in the dir and combine into a file

ls -v *.ts | sed -r "s/^(.+)/file '\1'/" > files.txt

Process that list of videos in ffmpeg

ffmpeg -f concat -i files.txt -c copy out.mp4