Set date and time:
date "+%Y/%m/%d %H:%M" > /Volumes/Fly6/config.txt
Concatenate/join videos from a folder and make the result YouTube-friendly:
ffmpeg -f concat -safe 0 -i <(for f in *.AVI; do echo "file '$(pwd)/$f'"; done) -c:v libx264 -preset slow -crf 18 -c:a copy -pix_fmt yuv420p ~/Movies/youtube-fly6-ride-$(date "+%Y-%m-%d").mkv
Don't try to write the output to the Fly6 SD card, as the filesystem won't support files >4GB.