file './wbbw_01.mp4' 
file './wbbw_02.mp4' 
file './wbbw_03.mp4' 
file './wbbw_04.mp4' 
file './wbbw_05.mp4' 
file './wbbw_06.mp4' 
file './wbbw_07.mp4' 
file './wbbw_08.mp4' 
file './wbbw_09.mp4' 
file './wbbw_10.mp4' 
file './wbb_cam_front_dec_16_2016.mp4'
#ffmpeg -f concat -i cam_files.txt -c copy all.mp4